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80 results about "Wavelength scale" patented technology

Birefringent interferometer

A birefringent interferometer system is described which uses nematic liquid crystal cells to produce variable optical path differences (OPD) between light of different polarization states that are interfered at a polarizing analyzer. Fixed retarders may also be incorporated to extend the range of OPD. The interferometer provides wide field-of-view, continuously variable path difference over a large range, and an on-board monitor of OPD for ensuring accurate settings of path difference, and hence, an accurate wavelength scale in the spectra produced by the apparatus. The system can further incorporate additional polarizing optics so it responds equally well to light of any incident polarization state without loss of efficiency.
Owner:CAMBRIDGE RES & INSTR

Device for measurement of optical wavelengths

PCT No. PCT / NO98 / 00031 Sec. 371 Date Jul. 29, 1999 Sec. 102(e) Date Jul. 29, 1999 PCT Filed Jan. 29, 1998 PCT Pub. No. WO98 / 36252 PCT Pub. Date Aug. 20, 1998A device for accurate and repeatable measurements of optical wavelengths, including an interrogation broadband light source (1) and a tuneable optical filter (2). A first part of the light is, in either order, transmitted through the filter (2) and reflected from, or transmitted through, at least one fibre Bragg grating (5) with known Bragg wavelength, providing an absolute wavelength reference, and directed to a first detector (7). A second part of the light is, in either order, transmitted through the filter and transmitted through, or reflected from a Fabry-Perot filter (8) with fixed and known free spectral range, creating a comb spectrum sampling the interrogation source spectrum to provide an accurate frequency / wavelength scale.
Owner:OPTOPLAN

High Quality Factor Photonic Crystal Nanobeam Cavity and Method of Designing and Making Same

A deterministic design and manufacturing of an ultrahigh Q-factor, wavelength-scale optical cavity is invented and experimentally demonstrated. The design can be implemented on photonic crystal nanobeam cavities, which are based on 1D optical waveguides. The waveguide has dielectric index alternations that provide constructive interference and produces optical resonance.
Owner:PRESIDENT & FELLOWS OF HARVARD COLLEGE

Spectrum scaling apparatus used for spectrum imager

The invention discloses a spectrum scaling apparatus used for a spectrum imager. The apparatus is characterized in that: a light beam which is emitted by a broadband light source (1) goes through a diaphragm (2) and a collimating lens (3) and irradiates a wavelength tuning optical filter (4), a plurality of narrowband optical signals which are distributed in a comb-shaped mode and have different wavelengths are outputted, after light intensity adjusting by a broadband bandpass optical filter (5), the signals enter into an integrating sphere (9) from an integrating sphere incident light hole (6) for depolarization and space uniformity processing, and an integrating sphere light extraction hole (8) outputs a surface light source. A spectrum imager to be measured is placed on the light extraction hole (8) for spectrum scaling. According to the apparatus, a birefringence crystal is utilized to carry out light transmission rate modulation, a passband peak value position and a bandwidth size can be adjusted, a plurality of narrowband light intensity signals changing with a wavelength are provided in a broadband range, wavelength scanning is not needed when carrying out spectrum scaling on the spectrum imager, wavelength scaling with one-time imaging is realized, and the apparatus is suitable for scaling a large field of view and large caliber spectrum imager.
Owner:SUZHOU UNIV +1

Quasi-surface plasma combined type slit wave guide and application thereof

The invention discloses a quasi-surface plasma combined type slit wave guide and an application thereof. The quasi-surface plasma combined type slit wave guide has a periodic micro-structure with sub-wavelength scale and a periodic Bragg structure with wavelength scale. The multi-scale combined type slit wave guide simultaneously has characteristics of artificial micro-structural meta-material and guide wave and band gap properties similar to those of a photonic crystal. The properties of the local effective medium of the combined wave guide can be controlled through the micro-structure with the sub-wavelength scale; the wave guide body can support the micro-wave band gap and a defect mode similar to a photonic crystal energy band. The micro-wave band gap and defect mode can respectively realize band-reject filter and band-pass filter. The quasi-surface plasma combined type slit wave guide combines the dispersion relation of the quasi-surface plasma wave guide and a Bloch theory to provide the band gap figure of the combined type wave guide in a geometrical parameter space.
Owner:HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL

Focusing multimodal optical microprobe devices

The present invention provides an optical microprobe device and method for focusing multimodal radiation with wavelength-scale spatial resolution and delivering the focused radiation to a specimen, including: a radiation source; and one or more of a plurality of optically transparent or semitransparent spheres and a plurality of optically transparent or semitransparent cylinders optically coupled to the radiation source; wherein the one or more of the plurality of optically transparent or semitransparent spheres and the plurality of optically transparent or semitransparent cylinders periodically focus radiation optically transmitted from the radiation source such that radiation ultimately transmitted to the specimen has predetermined characteristics. Preferably, the spheres or cylinders are assembled inside one of a hollow waveguide, a hollow-core photonic crystal fiber, a capillary tube, and integrated in a multimode fiber. Alternatively, the spheres or cylinders are assembled on a substrate. Optionally, the optical microprobe device also includes one or more of a waveguide, an optical fiber, a lens, and an optical structure disposed between the radiation source and the spheres or cylinders. Optionally, the spheres or cylinders are made from optically nonlinear or active materials that permit efficient nonlinear frequency generation and low-threshold lasing using the optical microprobe device.
Owner:JUNIVERSITI OF NORT KAROLINA EHT SHARLOTT

Phase angle controlled stationary elements for long wavelength electromagnetic radiation

An element for reflecting, transmitting, focusing, defocusing or wavefront correction of electromagnetic radiation in the terahertz frequency range. The elements include a grid of conductive strips including active regions comprising a chalcogenide phase change material. The chalcogenide material can be in an amorphous, crystalline or partially crystalline state. The dispersive characteristics of the grid (e.g. impedance, admittance, capacitance, inductance) influence one or more of the reflection, transmission, state of focusing or wavefront characteristics of incident electromagnetic radiation through the action of a stored phase taper formed by establishing a crystallinity gradient over a series of active chalcogenide regions or domains in one or more directions of the element. The dispersive characteristics of the grid are determined by the structural states of the active chalcogenide regions contained therein and are reconfigurable through transformations of one or more chalcogenide regions from one structural state to another by providing energy to the chalcogenide material. In a preferred embodiment, the individual active chalcogenide regions are much smaller than the operating wavelength of the element so that a plurality of active chalcogenide regions is included in wavelength scale domains. In these embodiments, crystallinity gradients may be formed through monotonic increases or decreases in the domain average fractional crystallinity in one or more directions of an element where no particular requirement on the fractional crystallinity of individual active regions need be imposed. In these embodiments, the domain fractional crystallinity is a statistical average over the individual chalcogenide regions contained therein and phase tapers may be achieved in multistate or binary mode. The element may be free-standing, supported on a dielectric substrate or interposed between two or more dielectric materials.
Owner:ENERGY CONVERSION DEVICES INC

Wavelength-scaled ultra-wideband antenna array

An ultra-wideband antenna array architecture includes a first array of radiating elements, a second array of radiating elements, and a third array of radiating elements, with their respective element widths proportionately ascending in size. In one configuration, the first array radiating element width is half a wavelength at the highest frequency of operation, the second array element width is twice the first width, and the third array element width is twice the second width. The first, second, and third arrays are positioned in a wavelength-scaled lattice wherein the wavelength scaling is based on design operative frequencies and whereby adjacent actively-radiating elements for an operative frequency are aligned so as to produce constructive interference when powered up. Feed means such as a diplexer with a selected-band frequency control then provides power to each array.
Owner:THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY

Enhanced-type echo-wall mode optical resonant cavity magnetic field sensing system

The invention provides an enhanced-type echo-wall mode optical resonant cavity magnetic field sensing system. A transmitting end of a broadband light source of the system is connected with an input end of an isolator, and the output end of the isolator is connected with the input end of an attenuator. The output end of the attenuator is connected with the input end of a wavelength scale optical fiber taper, and an optical fiber between the output end of the attenuator and the input end of the wavelength scale optical fiber taper is provided with a polarization controller. The wavelength scale optical fiber taper and a WGM optical resonant cavity structure which comprises magnetic fluid and a magnetostriction medium enable a light field in the optical fiber taper to be coupled to enter and come out of the resonant cavity in a mode of optical evanescent wave coupling. The output end of the optical fiber taper is connected with the receiving end of a spectrometer. According to the invention, the system introduces two magnetic field conversion mediums at the same time: the magnetic fluid and the magnetostriction medium, and the magnetic field conversion mediums will change the optical output characteristic of the WGM resonant cavity under the action of a magnetic field. The magnetic field conversion mediums act jointly to improve the magnetic field measurement precision of the WGM optical resonant cavity.
Owner:浙江知多多网络科技有限公司

Dielectric nano-brick array structure and application thereof as high-reflection film and high-permeability film

InactiveCN107664780AImprove work efficiencyGood angular bandwidthOptical elementsDielectricBrick
The invention discloses a dielectric nano-brick array structure and the application thereof as a high-reflection film and a high-permeability film. The dielectric nano-brick array structure comprisesa substrate and a dielectric nano-brick array on the substrate. The dielectric nano-brick array is formed by periodically arranging dielectric nano-bricks and the dielectric nano-bricks are in a regular quadrangular prism shape. The bottom surfaces of the dielectric nano-bricks are square, wherein the length, the width and the height of the dielectric nano-bricks are sized in sub-wavelength scale.When the dielectric nano-brick array structure is used as a high-reflectivity film, the structural parameters of the dielectric nano-brick array structure are optimized. In this way, the Mie resonance can be generated when the s-wave and the p-wave are incident at a working wavelength. When the dielectric nano-brick array structure is used as a high-permeability film, the structural parameters ofthe dielectric nanometer brick array structure are optimized. In this way, the equivalent refractive index of a mixed layer is between the refractive index of a medium around the mixed layer and therefractive index of the substrate. According to the technical scheme of the invention, the high-reflection film and the high-permeability film, based on the dielectric nano-brick array structure, arehigh in working efficiency in the whole communication wave band.
Owner:WUHAN UNIV

High quality factor photonic crystal nanobeam cavity and method of designing and making same

A deterministic design and manufacturing of an ultrahigh Q-factor, wavelength-scale optical cavity is invented and experimentally demonstrated. The design can be implemented on photonic crystal nanobeam cavities, which are based on 1D optical waveguides. The waveguide has dielectric index alternations that provide constructive interference and produces optical resonance.
Owner:PRESIDENT & FELLOWS OF HARVARD COLLEGE

Measuring method of dye sensitization nano-film solar cell I-V characteristic and conversion efficiency characteristic

A method for measuring the I-V characteristic and conversion efficiency characteristic of a dye-sensitived solar cell comprises the following steps: 1) sensitizing the IPCE characteristic data of the solar cell with a hardware measurement dye same to the ordinary solar cell IPCE measurement system: regulating a mercury lamp and the like to emit to the monochromator and keeping the wavelength scale of the monochromator consistent with that of the mercury lamp; 2) introducing the light of the mercury lamp into the monochromator with a mode of parallel emitting, connecting the standard reference batteries to two ends of the ammeter; 3) measuring the current signal of the reference battery under the illumination of 200nm homogeneous light, wherein the range of the measurement wavelength is 200nm-1100nm; 4) changing the dye-sensitived solar cell S1, and collecting data under same condition for calculating; and 5) measuring the I-V characteristic data of the dye-sensitived solar cell S1: regulating an analog light source, and adopting a balance bridge for compensating the circuit; regulating the constant pressure source, measuring the current flowing over the sample under the bias voltages of different scanning velocities, and obtaining the I-V characteristic.
Owner:NANJING UNIV

Infrared multi-wavelength absorber

The invention discloses an infrared multi-wavelength absorber, which comprises a substrate I 1, a structural layer I 2, an adhesive layer I 3, a dielectric layer 4, an adhesive layer II 5 and a structural layer II 6 in sequence, wherein the structural layer II 6 consists of a double cross structure array; the double cross structures are formed by splicing two cross structures; the angles of arrays in both x and y directions are 90 degrees; and the cycles in both x and y directions are of wavelength scale. According to the infrared multi-wavelength absorber, multi-wavelength absorption of an infrared band is realized by using the structure arrays of a single size; the infrared multi-wavelength absorber has a simple structural form and small thickness and is easy in control of the absorption characteristic; and the infrared multi-wavelength absorber has polarization characteristic and has broad application prospect in the application aspect of biosensors. A large volume of experimental data proves that the infrared multi-wavelength absorber has superior performance.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Phase angle controlled stationary elements for long wavelength electromagnetic radiation

An element for reflecting, transmitting, focusing, defocusing or wavefront correction of electromagnetic radiation in the terahertz frequency range. The elements include a grid of conductive strips including active regions comprising a chalcogenide phase change material. The chalcogenide material can be in an amorphous, crystalline or partially crystalline state. The dispersive characteristics of the grid (e.g. impedance, admittance, capacitance, inductance) influence one or more of the reflection, transmission, state of focusing or wavefront characteristics of incident electromagnetic radiation through the action of a stored phase taper formed by establishing a crystallinity gradient over a series of active chalcogenide regions or domains in one or more directions of the element. The dispersive characteristics of the grid are determined by the structural states of the active chalcogenide regions contained therein and are reconfigurable through transformations of one or more chalcogenide regions from one structural state to another by providing energy to the chalcogenide material. In a preferred embodiment, the individual active chalcogenide regions are much smaller than the operating wavelength of the element so that a plurality of active chalcogenide regions is included in wavelength scale domains. In these embodiments, crystallinity gradients may be formed through monotonic increases or decreases in the domain average fractional crystallinity in one or more directions of an element where no particular requirement on the fractional crystallinity of individual active regions need be imposed. In these embodiments, the domain fractional crystallinity is a statistical average over the individual chalcogenide regions contained therein and phase tapers may be achieved in multistate or binary mode. The element may be free-standing, supported on a dielectric substrate or interposed between two or more dielectric materials.
Owner:ENERGY CONVERSION DEVICES INC

Focusing multimodal optical microprobe devices

The present invention provides an optical microprobe device and method for focusing multimodal radiation with wavelength-scale spatial resolution and delivering the focused radiation to a specimen, including: a radiation source; and one or more of a plurality of optically transparent or semitransparent spheres and a plurality of optically transparent or semitransparent cylinders optically coupled to the radiation source; wherein the one or more of the plurality of optically transparent or semitransparent spheres and the plurality of optically transparent or semitransparent cylinders periodically focus radiation optically transmitted from the radiation source such that radiation ultimately transmitted to the specimen has predetermined characteristics. Preferably, the spheres or cylinders are assembled inside one of a hollow waveguide, a hollow-core photonic crystal fiber, a capillary tube, and integrated in a multimode fiber. Alternatively, the spheres or cylinders are assembled on a substrate. Optionally, the optical microprobe device also includes one or more of a waveguide, an optical fiber, a lens, and an optical structure disposed between the radiation source and the spheres or cylinders. Optionally, the spheres or cylinders are made from optically nonlinear or active materials that permit efficient nonlinear frequency generation and low-threshold lasing using the optical microprobe device.
Owner:JUNIVERSITI OF NORT KAROLINA EHT SHARLOTT

FBG strain transducer strain-wavelength calibrator under low-temperature liquid helium environment

This invention disclosed a FBG sensor and wavelength scaling device working in low temperature liquid helium circumstance. It consists of screw micrometer head and a cantilever dynamic platform. The characters are as follows: place the micrometer head and platform into a low temperature Dewar flask with liquid helium; a cantilever was fixed on the platform; the micrometer head was fixed on cover of the Dewar flask; one end of the head was connected to the displacement pole in the flask to form a force application device; the grating sensor of the FBG was sticked to the cantilever arm. The base and backbone of the cantilever arm were made of epoxy stuff.
Owner:INST OF ELECTRICAL ENG CHINESE ACAD OF SCI

Method for Detection of Gases by Laser Spectroscopy, and Gas Sensor

A method and a sensor for detecting a target gas by laser spectroscopy using a laser or a laser diode having a monochrome emission wavelength that can be modulated by varying the operating temperature or the operating current. The wavelength range of the target gas comprises a first modulation of the laser or the laser diode over a first large modulation width, in addition to at least two absorption lines of a reference gas and at least one absorption line of the target gas. The absorption lines are used to calibrate the wavelength scale of the laser or the laser diode in relation to the varied operating temperature or operating current, a second modulation of the laser or the laser diode being performed over a second small modulation width, with the at least one absorption line of the target gas, for detecting the target gas.
Owner:SIEMENS AG

Method for generating and applying instrument profiles

The invention relates to a method for generating calibrated colour data of a target using colour measurement instruments distributed in the network comprising the steps A) generating at least one standard instrument profile for the colour measurement instruments distributed in the network to correct photometric and wavelength scale differences, and B) generating at least one geometry instrument profile for the colour measurement instruments distributed in the network to correct geometry scale differences. The method can be used in applications where colour measurement instrument networks are used, particularly in robotic systems where colour measurement instruments are integrated.
Owner:AXALTA COATING SYST IP CO LLC

Nonvolatile programmable integrated photonic device and design method thereof

The invention discloses a nonvolatile programmable integrated photonic device and a design method thereof, and belongs to the field of photonic devices. A multimode waveguide of the integrated photonic device comprises N*M logic units capable of independently adjusting tuning states, and N and M are positive integers; each logic unit comprises a cuboid structure which is provided with a groove andmade of silicon and a filling structure which is filled in the groove and made of a phase change material, and each logic unit is of a sub-wavelength size structure. By adjusting the tuning state ofeach logic unit, the distribution of the refractive indexes of the device is adjusted and controlled in the sub-wavelength scale, and photonic devices with different functions are realized. The phasechange material is combined with a photonic-like crystal structure; the non-volatile and programmable ultra-small integrated photonic device is realized by utilizing the non-volatile and reconfigurable characteristics of the phase change material and utilizing the light field regulation and control capability of the sub-wavelength scale of the photonic-like crystal structure, the device size and energy consumption are reduced, and more tuning functions are realized, so that different functional purposes are realized.
Owner:HUAZHONG UNIV OF SCI & TECH

Dispersive near-infrared spectrometer with automatic wavelength calibration

The present invention is a dispersive, diffraction grating, NIR spectrometer that automatically calibrates the wavelength scale of the instrument without the need for external wavelength calibration materials. The invention results from the novel combination of: 1) a low power He—Ne laser at right angles to the source beam of the spectrometer; 2) a folding mirror to redirect the collimated laser beam so that it is parallel to the source beam; 3) the tendency of diffraction gratings to produce overlapping spectra of higher orders; 4) a “polka dot” beam splitter to redirect the majority of the laser beam toward the reference detector; 5) PbS detectors and 6) a software routine written in Lab VIEW that automatically corrects the wavelength scale of the instrument from the positions of the 632.8 nm laser line in the spectrum.
Owner:BUSCH KENNETH W +1

Near-field microscopy system and construction method thereof

InactiveCN111044481AWon't cause driftAvoid drastic attenuationMaterial analysis by optical meansInfraredThermal dilatation
The invention provides a near-field microscopy system and a construction method thereof. The near-field microscopy system comprises an infrared / terahertz laser, a light path coupling module and an atomic force microscope. Accurate imaging and spectrum formation can carried out on morphology, physicochemical and molecular characteristics of a sample under a sub-wavelength scale. According to the photo-induced thermal expansion effect of infrared / terahertz dual-band adjustable radiation, thermal expansion deformation of the material is associated with infrared / terahertz characteristic absorption, and structural property information of the material is directly extracted through an atomic force probe. According to the invention, an infrared / terahertz optical detector does not need to be arranged at the far end, thereby avoiding violent signal attenuation caused by long-distance transmission; a reference light path does not need to be arranged, and the repeatability and reliability of material sub-wavelength structure information detection can be remarkably enhanced; meanwhile, the system has the advantages of being high in imaging speed, completely harmless to organisms, high in resolution ratio, capable of achieving multi-mode synchronous output and the like, and good complementation with existing existing mainstream medical imaging means is realized.
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI

Space distribution PML model-based absorption material and miniature dark chamber

The invention discloses a space distribution PML model-based absorption material and a miniature dark chamber. A wave absorption unit comprises a grounding metal layer, a metal pattern and an intermediate-layer dielectric substrate, wherein the metal pattern is arranged on an upper surface of the intermediate-layer dielectric substrate, the intermediate-layer dielectric plate is arranged on an upper surface of the grounding metal layer, an electromagnetic wave polarized along a fixed direction irradiates the wave absorption unit at a known incident angle, and relative dielectric constant and areflection parameter of relative permeability conform to a certain condition by adjusting the size morphology of the metal pattern. An inner wall of the dark chamber is formed by closely arranging the wave absorption units, and for other positions, except an electromagnetic wave source fixed position, in the dark chamber, the wave absorption unit at the position is arranged according to an incident angle between the electromagnetic wave emission source and the position and according to the condition. An ultrathin absorption surface can be designed with a given frequency band, the wave absorption unit works in an opened or closed planar or curve-surface state with regard to different demands, and the wave absorption unit can be used for constructing the miniature wave absorption dark chamber with wavelength scale.
Owner:ZHEJIANG UNIV

Long-distance small displacement detecting method based on microwave signals

The invention discloses a long-distance small displacement detecting method based on microwave signals. A microwave transmitter is fixed to a measured target object and moves along with the measured target object. The microwave transmitter emits a microwave signal to bypass a metal circular barrier, and then a microwave signal receiving device performs microwave detection. The microwave signal receiving device includes first, second and third receiving antennas and a receiving detecting circuit. The second receiving antenna is placed at a determined Arago point formed by the diffraction of themicrowave signal bypassing the metal circular barrier. The signal amplitudes and the phase differences of the receiving antennas are compared to obtain the small displacement of a microwave source less than the wavelength scale. The signal amplitudes, phases and frequencies of the receiving antennas are compared to obtain the amplitude and the frequency of the micro vibration of the long-range microwave source smaller than the wavelength scale. The method is suitable on occasions where an optical method cannot be used, is low in cost, high in measurement sensitivity, simple in system deployment, and good in applicability.
Owner:ZHEJIANG UNIV

High-efficiency super-surface vortex focusing lens

The invention discloses a high-efficiency super-surface vortex focusing lens, and relates to the technical field of optical lenses. The lens comprises a substrate and a phase wavefront that is arranged on the substrate and has vortex focusing characteristics; the phase wavefront is composed of a plurality of nano-columns, and the corresponding phase values are given according to the position points of the nano-columns to convert the incident plane waves into vortex light having an arbitrary orbital angular momentum and focus the vortex light at a specified focal length; and a wavelength-scaleenergy ring is formed. Since the adopted theoretical mechanism can make full use of the incident light energy in addition to absorption and reflection, the size and distribution period of nano-antennas are also optimized, and point-by-point phase modulation is performed on a target wavefront rather than region-by-region phase modulation, so that the designed super-surface vortex lens can achieve afocusing efficiency of up to 80%, and the wavelength-scale high-energy vortex light can be formed.
Owner:SOUTH CHINA NORMAL UNIVERSITY

Pulse micro displacement sensor and displacement measuring method thereof

The invention discloses a pulse micro displacement sensor and a displacement measuring method thereof. The sensor comprises an infrared light source, a moving grating, a fixed grating, a first infrared photoelectric multiplier, a second infrared photoelectric multiplier, a first comb-like electrode, a second comb-like electrode, an upper-layer capacitor flat plate, a lower-layer capacitor flat plate, a cantilever beam in the shape of a Chinese character hui of the moving grating, a processing module for calculating the displacement according to the photoelectric signal and a current drive module for conveying current to the comb-like electrodes and the capacitor flat plates. When the interval of the two layers of the gratings is precisely controlled within the wavelength scale of 1 / 5 according to a special condition in a Wood abnormal phenomenon, the parameters such as period and duty cycles of the gratings are regulated; when the two layers of the gratings move, reflected light generates a pulse type change phenomenon which has slope higher than that of common Wood abnormal light intensity change flat curve, so that the tiny displacement signal can be greatly amplified to measure the displacement. Moreover, the dynamic range is expanded, the miniaturization is realized, and the application prospect in the military filed is wide.
Owner:ZHEJIANG UNIV

Systems and methods for ultra-ultra-wide band aesa

In one aspect, the inventive concepts disclosed herein are directed to an antenna array system employing a current sheet array (CSA) wavelength scaled aperture. The CSA wavelength scaled aperture can include a first frequency region associated with a first operating frequency band and a second frequency region associated with a second operating frequency band. The first operating frequency band can include one or more current sheet sub-arrays having a respective plurality of first unit cells scaled to support the first operating frequency band. The second operating frequency band can include one or more current sheet sub-arrays having a respective plurality of second unit cells scaled to support the second operating frequency band. The CSA wavelength scaled aperture can include one or more capacitors each of which coupled to a respective first unit cell of the first frequency region and a respective second unit cell of the second frequency region.
Owner:ROCKWELL COLLINS INC

Three-dimensional split ring resonator metamaterial radio frequency identification tag

InactiveCN109840579AAchieve functions beyond the traditionalLower resonant frequencyRecord carriers used with machinesUnit sizeMaterial Design
The invention relates to a sub-gigahertz (Sub-GHz) low-profile 3D SRR (three-dimensional split ring resonator) metamaterial for increasing the radio frequency identification range. The metamaterial iscomposed of periodically placed sub-wavelength structures to generate a specific effect on incident electromagnetic waves. Generally, the electromagnetic metamaterials are 1 / 2 wavelength scales, while these metamaterials are typically used for high frequency applications from 10 GHz to 20 GHz. According to the application of sub-GHz, the unit size is actually too large, and the application of metamaterial in sub-GH is limited; The invention provides an innovative low-profile ultra-low frequency material design for a UHF (ultra-high frequency) RFID (radio frequency identification) tag. The tagworks from 860 MHz to 960 MHz. The metamaterial is an innovative 3D SRR (three-dimensional split ring resonator) structure. The 3D SRR structure achieves the expected ultra-low frequency specific effect through the design, simulation and test of the model. As the metamaterial can inhibit propagation of surface waves, the metamaterial is also very high in radiation efficiency.
Owner:HKUST SHENZHEN RES INST +1

Small-pixel infrared focal plane detector based on metasurface lens

The invention discloses a small-pixel infrared focal plane detector based on a metasurface lens. The small-pixel infrared focal plane detector based on the metasurface lens comprises an infrared focal plane detector body and the metasurface lens formed at a substrate. The metasurface lens is composed of a plurality of small cylinders with sub-wavelength scales, the positions and the diameters of the small cylinders are arranged according to a phase rule, and the metasurface can modulate wavefront of incident light so that the incident light can be focused on an absorption layer of a detector pixel. Compared with a traditional infrared focal plane detector, the infrared focal plane detector has the advantages that focusing light spots in the sub-wavelength magnitude can be achieved, the pixel size can be reduced to the wavelength magnitude, and development of a planar focal plane device towards smaller pixels and higher pixel density is facilitated. Meanwhile, under the condition that the light response of the device is not changed or improved, the dark current of the device is reduced, the signal-to-noise ratio is improved, and photoelectric crosstalk between pixels is inhibited.
Owner:SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI

Ultra-thin wave absorber based on deep sub-wavelength slits

The invention discloses an ultra-thin wave absorber based on deep sub-wavelength slits, which is characterized in that the thickness of a unit structure of the ultra-thin wave absorber is a deep sub-wavelength scale, namely, one percent wavelength magnitude and below, the ultra-thin wave absorber is divided into three layers along the height direction, namely, a metal patch, a dielectric spacer layer and a metal back plate from top to bottom, and an air slit with a deep sub-wavelength width is arranged between adjacent metal patches; the dielectric spacer layer is made of a low-loss material with the loss tangent value tan[delta] being less than 0.01, or the dielectric spacer layer is made of a lossless material; the wave absorbing wavelength is changed by changing the size of the metal patch and adjusting the thickness of the dielectric spacer layer so as to achieve wave absorption, and the wave absorber can work in all frequency bands from terahertz, microwaves to radio frequency. The thickness of the wave absorber is very small, the thickness of the wave-absorbing device is reduced to a few hundredths of wavelength from the traditional a few tenths of wavelength, and the wave absorber is very thin and light in weight and has certain flexibility; a mature circuit board process can be adopted for manufacturing, and the cost is reduced; and the wave absorbing effect is not sensitive to the incident angle, and the wave absorber has a conformal advantage and can cover the curved surface.
Owner:ZHEJIANG UNIV
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