Plane diffraction based grapheme surface special light beam generator

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...

AI Technical Summary

Problems solved by technology

A large phase modulation range is very important for beam shaping technology, but the thickness of a single sheet of graphene on the dielectric layer is too thin, and the interaction between light and graphene is too weak to rely only on changing the width of the graphene array band or Fermi It is difficult to achieve phase modulation in the range of 2π in the energy level

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