222 results about "Slow light" patented technology

Methods and devices for optical beam steering are disclosed including coupling a laser light into an apparatus comprising a first substrate; an array of air core photonic crystal waveguides; columnar members etched around each air core waveguide; a pair of metal electrodes around the columnar members; a trench around the pair of metal electrodes surrounding each air core photonic crystal waveguide; a second substrate coupled to the first substrate comprising electrical interconnection lines; and a holographic fanout array comprising a third substrate; a photopolymer film coated on the third substrate; a hologram written in the photopolymer film configured to couple the laser light into the third substrate; and an array of holograms recorded in the photopolymer film configured to couple a portion of the laser light into the waveguides; and passing a current through the electrodes to induce a refractive index change in the first substrate to control the phase of the portion of the laser light that passes through each waveguide. Other embodiments are described and claimed.

Methods and systems for label-free on-chip optical absorption spectrometer consisting of a photonic crystal slot waveguide are disclosed. The invention comprises an on-chip integrated optical absorption spectroscopy device that combines the slow light effect in photonic crystal waveguide and optical field enhancement in a slot waveguide and enables detection and identification of multiple analytes to be performed simultaneously using optical absorption techniques leading to a device for chemical and biological sensing, trace detection, and identification via unique analyte absorption spectral signatures. Other embodiments are described and claimed.

The present invention includes an apparatus and corresponding method for temperature correction and count rate expansion of inorganic scintillation detectors. A temperature sensor is attached to an inorganic scintillation detector. The inorganic scintillation detector, due to interaction with incident radiation, creates light pulse signals. A photoreceiver processes the light pulse signals to current signals. Temperature correction circuitry that uses a fast light component signal, a slow light component signal, and the temperature signal from the temperature sensor to corrected an inorganic scintillation detector signal output and expanded the count rate.

An optical device that comprises an input waveguide, an output waveguide, a high-Q resonant or photonic structure that generate slow light connected to the input waveguide and the output waveguide, and an interface, surface or mode volume modified with at least one material formed from a single molecule, an ordered aggregate of molecules or nanostructures. The optical device may include more than one input waveguide, output waveguide, high-Q resonant or photonic structure and interface, surface or mode volume. The high-Q resonant or photonic structure may comprise at least one selected from the group of: microspherical cavities, microtoroidal cavities, microring-cavities, photonic crystal defect cavities, fabry-perot cavities, photonic crystal waveguides. The ordered aggregate of molecules or nanostructures comprises at least one selected from the group of: organic or biological monolayers, biological complexes, cell membranes, bacterial membranes, virus assemblies, nanowire or nanotube assemblies, quantum-dot assemblies, one or more assemblies containing one or more rhodopsins, green fluorescence proteins, diarylethers, lipid bilayers, chloroplasts or components, mitochondria or components, cellular or bacterial organelles or components, bacterial S-layers, photochromic molecules. Further, the molecular aggregate may exhibit a photoinduced response.

A slow light system includes a substrate and a metal layer formed thereon, the metal layer having a graded grating structure formed at a surface thereof, wherein the grating depth of the grating structure is sized such that surface-plasmon polariton dispersion behavior of the grating structure differs at different respective locations along the grating structure. Different wavelengths of incident light waves can be slowed at the respective locations along the grating structure.

The invention provides an angle measuring device and an angle measuring method of a double-frequency laser interferometer based on a slow-light material, which relates to an angle measuring device and an angle measuring method of the double-frequency laser interferometer. The angle measuring device provided by the invention aims at solving the problem of low angle measuring sensitivity of the angle measuring device of the existing double-frequency laser interferometer. Double-frequency laser is divided into polarized light with frequency at v1 and polarized light with frequency at v2 through a polarization spectroscope in a polarization direction. The polarized light with the frequency at v1 enters a pyramid prism 1 to be reflected to the polarization spectroscope through the pyramid prism 1; the polarized light with the frequency at v2 is reflected to the slow-light material sequentially through a common corner reflector, the slow-light material and a pyramid prism 2 and then is reflected to the polarization spectroscope sequentially through the slow-light material and the common corner reflector to converge with polarized light reflected through the pyramid prism 1 at the position of the polarization spectroscope so as to form beat frequency; and converged light enters an optical detection face of a photoelectric detector after being subjected to transmission of a polarization reducing device. The angle measuring device and the angle measuring method provided by the invention are applicable to the electromagnetic induction transparency technology and the spectral hole burning technology.

A variable semiconductor all-optical buffer and method of fabrication is provided where buffering is achieved by slowing down the optical signal using a control light source to vary the dispersion characteristic of the medium based on electromagnetically induced transparency (EIT). Photonic bandgap engineering in conjunction with strained quantum wells (QWs) and quantum dots (QDs) achieves room temperature operation of EIT. Photonic crystals are used to sharpen the spectral linewidths in a quantum well structure due to its density of states and in a quantum-dot structure caused by the inhomogeneity of the dot size, typically observed in state-of-the-art QD materials. The configuration facilitates monolithic integration of an optical buffer with an amplifier and control laser to provide advantages over other material systems as candidates for optical buffers.

Methods and devices for optical beam steering are disclosed including coupling a laser light into an apparatus comprising a first substrate; an array of air core photonic crystal waveguides; columnar members etched around each air core waveguide; a pair of metal electrodes around the columnar members; a trench around the pair of metal electrodes surrounding each air core photonic crystal waveguide; a second substrate coupled to the first substrate comprising electrical interconnection lines; and a holographic fanout array comprising a third substrate; a photopolymer film coated on the third substrate; a hologram written in the photopolymer film configured to couple the laser light into the third substrate; and an array of holograms recorded in the photopolymer film configured to couple a portion of the laser light into the waveguides; and passing a current through the electrodes to induce a refractive index change in the first substrate to control the phase of the portion of the laser light that passes through each waveguide. Other embodiments are described and claimed.

The utility model relates to a resonator fiber optic gyro with high sensitivity, belonging to the technical field of a fiber optic gyro, which aims at overcoming the problems that low sensibility (0.1 degree / hour) exists upon prior resonator fiber optic gyro and can not meet attitude tracking of short range / midrange missiles and commercial aircrafts, more particularly can not meet areas such as space positioning and submarine navigation with high requirement for sensibility. The utility model is characterized in that a laser output end of a frequency conversion laser (1) is connected with a dispersion fiber ring resonator (11) through a group speed control system (2), a fiber beam splitter (3), a first lithium niobate phase modulator (4), a second lithium niobate phase modulator (5), a first optical fiber coupler (6), a second optical fiber coupler (7) and a third optical fiber coupler (10). The utility model has the advantages of high sensibility up to ng times (The ng is group speed refractive index), low production cost, simple structure and small size.

The invention provides a dielectric cylinder photonic crystal zero dispersion slow optical wave guide which comprises a substrate, a plurality of coupled cavities, a plurality of dielectric cylinders and an excitation source, wherein each coupled cavity is a rectangular cylinder, and the coupled cavities are vertically manufactured above the middle part of the substrate in a row and are used for regulating a slow light mode; each dielectric cylinder is a cylinder, and the dielectric cylinders are vertically manufactured above the substrate in a plurality of rows, are arranged at both sides of the coupled cavities and are used for laterally limiting a light field; and the excitation source is arranged at one side of the substrate, is relative to the coupled cavities in a row and excites the slow light mode to generate.

The invention discloses an E-shaped all-dielectric super-surface electromagnetic induction transparent resonance device. The device comprises a substrate and E-shaped dielectric resonance units whichare located on the surface of the substrate and distributed in a two-dimensional periodicity mode, the substrate is made from dielectric materials, and the dielectric constant of the substrate is larger than 0 and smaller than or equal to 5; the dielectric constant of the E-shaped dielectric resonance units is larger than or equal to 6. Accordingly, the group refractive index can be increased, andthe slow light effect can be achieved. Meanwhile, the device can be used for high-sensitivity refractive index sensing devices.