Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Device and method for modulating forbidden band fluorescence polarization of two-dimensional crystal

A two-dimensional crystal, fluorescence polarization technology, applied in the field of nano-photonics, can solve the problems of temperature limitation and small polarization modulation, and achieve the effect of small size, optimized structure design, and flexible and adjustable size

Pending Publication Date: 2020-09-29
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings and deficiencies of the above-mentioned modulation methods, the present invention proposes a device and method for modulating the polarization of two-dimensional crystal bandgap fluorescence using anisotropic metamaterials to solve the problems of small polarization modulation and limited by temperature

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Device and method for modulating forbidden band fluorescence polarization of two-dimensional crystal
  • Device and method for modulating forbidden band fluorescence polarization of two-dimensional crystal
  • Device and method for modulating forbidden band fluorescence polarization of two-dimensional crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] Example 1: WS 2 Monolayer Fluorescence Polarization Test

[0102] First, on SiO 2 / Si substrate, WS was formed by chemical vapor deposition 2 Single layer: heat the powders of sulfur and tungsten to generate steam, and use argon as a carrier gas to bring the steam to a clean substrate for deposition and growth to obtain WS 2 single layer.

[0103] Figure 4A is the WS 2 Optical microscopy imaging of monolayers. Figure 4B is the emission fluorescence spectrum in the TE and TM directions obtained through the test in step S302. Depend on Figure 4B It can be seen that the fluorescence intensity of the sample is equal in the TE and TM directions, and the WS 2 The fluorescence peak of the monolayer is at ~630nm, the full width at half maximum is ~30nm, and the forbidden band width is 1.9-2.0eV. Figure 4C It is a diagram of the variation of the fluorescence spectrum with the exit angle obtained through the test in step S303. Depend on Figure 4C It can be seen th...

Embodiment 2

[0104] Example 2: Ag nanowire grid pair WS 2 Device for Modulating the Polarization of Forbidden Fluorescence

[0105] Since the modulation method proposed in the present invention is based on the principle of metamaterial surface plasmon resonance, which is affected by the shape of the metamaterial, three metal nano-metamaterials with three shapes are designed to modulate the fluorescence linearity in this example. They are nano wire grid, V type nano grid and N type nano grid.

[0106] The period selection of the unit structure is determined according to the fluorescence wavelength of the two-dimensional crystal. For example, the periods of N and V-type nanostructures in the TE and TM polarization directions can be set to 200nm and 400nm respectively, so that the metamaterial surface plasmon resonance will be in the monolayer WS 2 Fluorescence wavelength ~ 630nm generated near. Further adjustment of the inclination angle of the air gap in the structural unit can adjust th...

Embodiment 3

[0129] In addition to the above systems, the preferred two-dimensional crystals are single-layer WSe 2 . WS 2 The monolayer has higher quantum efficiency and longer fluorescence wavelength 750nm. by the WSe 2 The structure and process of the single-layer preparation metamaterial-two-dimensional crystal bandgap fluorescence polarization modulation device are the same as in Example 2. The period of the selected nanostructure should be determined according to the fluorescence wavelength, and the thickness of the selected medium layer is determined by the wavelength of the excitation light. The principles are described in the Technical Program Brief. Generally, the wavelength increases, the metal dissipation decreases, the surface plasmon resonance response increases, and the effect on fluorescence linearity modulation is better.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a device and a method for modulating forbidden band fluorescence polarization of a two-dimensional crystal. The device comprises a high-conductivity material substrate, an insulating layer formed on the high-conductivity material substrate, a two-dimensional crystal monolayer formed on the insulating layer, a light-transmitting dielectric layer formed on the two-dimensionalcrystal monolayer, and a metal nano metamaterial with a periodic unit structure formed on the light-transmitting dielectric layer. Based on a metal surface plasmon resonance principle, a semiconductor fluorescence field is regulated and controlled by utilizing an anisotropic resonance field of the metal nano metamaterial so that polarized fluorescence is realized, and a purpose of polarization adjustability is achieved. According to the device and the method for modulating the polarization of the two-dimensional crystal forbidden band fluorescence, a linear adjustable range and a temperatureapplication range of the two-dimensional crystal forbidden band fluorescence are effectively widened.

Description

technical field [0001] The invention belongs to the technical field of nano-optoelectronics, and in particular relates to a device and method for modulating the polarization of two-dimensional crystal forbidden band fluorescence. Background technique [0002] Polarity-adjustable micro-nano light sources have special advantages in information security, high-sensitivity sensing, structural analysis, and pathogen diagnosis. The new two-dimensional crystals that have emerged in recent years have a wide range of direct bandgap selectivity, structural stability, photoelectric tunability, and substrate diversity, and have excellent conditions for on-chip micro-nano light sources. However, due to the polarization randomness of fluorescence at room temperature, the application range of micro-nano light sources is limited, so polarization modulation of on-chip light sources is required. [0003] The macroscopic optical path utilizes polarizers and polarizing prisms to modulate the po...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G02B5/00G02F1/01
CPCG02B5/008G02F1/0136
Inventor 韩春蕊叶剑挺齐月静王宇
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com