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

A graphene-based dynamically tunable optical holographic structure

A holographic structure, graphene technology, applied in the directions of recording/reproducing by optical methods, optical recording/reproducing/erasing methods, recording/reproducing/erasing using optical interference patterns, etc., can solve the tunable terahertz Optical holography has not been reported, and there are few problems such as optical holography, achieving the effect of miniaturization and integration, compact structure, and simple control method.

Active Publication Date: 2020-12-08
HARBIN ENG UNIV
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, the research work on using metasurfaces to realize metasurface optical holography is currently mainly concentrated in the optical band, and there are relatively few optical holograms in the terahertz band, and tunable terahertz optical holography has not been reported.

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
  • A graphene-based dynamically tunable optical holographic structure
  • A graphene-based dynamically tunable optical holographic structure
  • A graphene-based dynamically tunable optical holographic structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In view of the above technical problems, the present invention discloses a dynamically tunable optical holographic structure based on graphene in the terahertz band, which can realize the dynamic adjustment of the holographic pattern by adjusting the excitation voltage applied to the graphene in the terahertz band. The invention has a compact design structure, is conducive to realizing the miniaturization and integration of optical devices, and provides a new tunable optical holographic design idea in the terahertz band.

[0024] 1. Graphene theoretical model

[0025] In the optical properties of graphene, at the k(k') point in the Brillouin zone, the valence and conduction bands generated by the mixed orbitals are weakened. Around these points, the tightly bound Hamiltonian can be linearized and written as

[0026]

[0027] where v≈10 6 m / s is the Fermi velocity. This Hamiltonian turns out to be the energy-dispersion relation of the conduction and valence bands g...

Embodiment 2

[0047] The invention provides a dynamically tunable optical holographic structure based on graphene. The pixel unit structure on the metasurface is of sub-wavelength order, and the dynamic selection of multiplexed images can be realized by adjusting external excitation. Firstly, phase maps of two target images are generated by computational holography, encoded at different frequencies by two gradient phase structural units of different sizes, and compounded together. Modulate the Fermi level distribution of graphene by adjusting the method of external bias excitation, affect the conductivity of graphene to further blue-shift or red-shift the transmission spectrum of terahertz waves, and realize the holographic pattern in the composite state of two images. Dynamic regulation and switching. The graphene-based dynamically tunable optical holographic design designed by the present invention has a compact structure, is conducive to the miniaturization and integration of optical dev...

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
Login to View More

Abstract

The invention discloses a dynamic tunable optical holographic design based on graphene, and belongs to the field of metamaterial. The structure comprises a metasurface, graphene, ionic gel and a voltage device; a layer of single-layer graphene is placed on the metasurface; the ion gel covers the single-layer graphene, one end of the voltage device is connected with the single-layer graphene, the other end of the voltage device is connected with the ion gel, the pixel units on the super surface are formed by compounding gradient phase structures with different sizes, and the gradient phase structures encode different target images by using different frequencies. According to the invention, the blank in the field of tunable optical holography in the Hertz wave band is filled; the pixel structure designed by the invention is in sub-wavelength magnitude and compact in structure, and miniaturization and integration of an optical device are facilitated; compared with regulation and control methods of temperature, illumination and the like, the regulation and control method is simpler, more convenient and more practical by regulating external voltage excitation.

Description

technical field [0001] The invention belongs to the field of metamaterials, in particular to a graphene-based dynamically tunable optical holographic structure. Background technique [0002] Graphene is a single layer of graphite with only one layer of carbon atoms, and the thickness of graphene is generally 0.34nm. The carbon atoms are arranged in a hexagonal lattice, and the carbon atoms are connected by s bonds, which has the characteristics of a zero-gap energy band structure. At the beginning, people thought that graphene was just a false structure and could not exist stably. Until 2004, Andre Geim and Konstantin Novoselov in the UK obtained graphene by mechanical exfoliation. Since then, graphene has caused a worldwide research boom all over the world. Graphene has many excellent properties. Applying graphene to control the propagation of terahertz is a hot direction in the development of terahertz technology in recent years. By adjusting the applied voltage of grap...

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
Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/0065G11B7/241
CPCG11B7/0065G11B7/241G11B2007/24328
Inventor 朱正来鹏涛孙梦柯吕博李玉祥关春颖史金辉
Owner HARBIN ENG UNIV
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