Plane diffraction based grapheme surface special light beam generator

A graphene surface and beam generator technology, applied in the field of optics, can solve the problems of difficult phase modulation, weak interaction between light and graphene, etc., and achieve the effects of strong binding ability, easy practical operation, and wide application potential

A graphene surface and beam generator technology, applied in the field of optics, can solve the problems of difficult phase modulation, weak interaction between light and graphene, etc., and achieve the effects of strong binding ability, easy practical operation, and wide application potential

CN107843947AInactive Publication Date: 2018-03-27HARBIN ENG UNIV
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  • Plane diffraction based grapheme surface special light beam generator
  • Plane diffraction based grapheme surface special light beam generator
  • Plane diffraction based grapheme surface special light beam generator

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Experimental program
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Embodiment 1

[0030] Embodiment 1: Taking the graphene surface Airy beam generator based on plane diffraction as an example, take figure 1 A cross-section of a coupled grating unit in . The conductivity of graphene is calculated by using the Kubo equation, and the dielectric constant of silica in the mid-infrared band is set to 3.9. Here, the groove depth is set to be 100nm, the cell lattice constant is 250nm to 350nm, the graphene thickness is 0.7nm, the incident mid-infrared light frequency is 34.88THz, and the chemical potential of graphene is 0.65eV. Make the x-direction polarized light incident on the graphene surface vertically, Fig. 3(a) is the relationship between transmittance, reflectivity and absorptivity with the coupling grating constant, Fig. 3(b) is when the coupling grating constant is 290nm, graphene, etc. The distribution of electric field modes when ion polaritons have a maximum absorption coefficient of 33%. It can be seen that a greatly enhanced surface plasmon field ...

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Abstract

The invention belongs to the field of optical technology and especially relates to a plane diffraction based grapheme surface special light beam generator applied to a special light beam generation and light beam reshaping field. According to the invention, silicon dioxide is adopted as the substrate; the substrate is provided with coupling grating arrays and nano groove arrays arranged periodically and a single grapheme layer is spread on the substrate, thus the generator is formed. The SPP special light beam generator is high in mode constraint capability, super long in light beam propagation distance and is significant in micro-optical particle operation and light beam reshaping. Due to the good tenability and material flexibility of the grapheme, dynamic adjustment performance of the device is realized and practical operation is facilitated. The generator can work in an middle-infrared band and a terahertz band. Moreover, since the SPP waves of the terahertz band are exactly in a sensitive band of living matters, so that the plane diffraction based grapheme surface special light beam generator has great application potential in the biosensing field.

Description

technical field [0001] The invention belongs to the field of optical technology, in particular to a graphene surface special beam generator based on plane diffraction used in the fields of special beam generation and beam shaping. Background technique [0002] Beam shaping and manipulation based on modulation of light wave amplitude and phase is one of the current research hotspots, and plays an important role in the fields of optical micro-manipulation and optical micro-trapping. Most beam shaping techniques rely on linear optics and thus only work at a single wavelength or set parameters, which cannot be adjusted externally. Recently, a multi-wavelength achromatic beam focusing device based on phase-converting materials has been developed, and the beam can be adjusted by applying voltage to the device, changing the temperature or changing the incident light. [0003] Non-diffracting Airy beams have received great attention due to their unique properties such as lateral ac...

Claims

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Application Information

Patent Timeline
27 Mar 2018
Publication
CN107843947A
IPC
G02B5/18
CPC
G02B5/1809; G02B5/1819; G02B5/1857; G02B5/1866; G02B2005/1804
Inventors
关春颖; 黄鹏