Method for representing real space characteristics of two-dimensional polariton

Abstract

The invention provides a method for representing real space characteristics of two-dimensional polaritons, which comprises the following steps of: S1, placing a sample to be tested on a SiO2 / Si substrate, and enabling one edge of the sample to be tested and the edge of a cantilever arm of a scattering type near-field optical microscope to form an angle of 45 degrees; s2, enabling the needle point of the scattering type near-field optical microscope to scan along the edge vertical to the tested sample, sequentially changing the wavelength of the excitation laser light source, and scanning by the scattering type near-field optical microscope to obtain a near-field real space image; s3, Fourier transform processing is carried out on the near-field real space images obtained in the step 2 one by one, and a wave vector real part k'p and a propagation length Lp of a hybrid polariton mode are obtained respectively; and S4, obtaining wave vectors k'p and Lp of the hybrid polaritons under each wavelength according to a formula. The diffraction limit is broken through through the scattering type near-field optical microscope, the physical phenomenon of interaction between light and substances in a near-field area is explored, and the real space characteristics of two-dimensional polaritons are presented.

Description

technical field [0001] The invention relates to the technical field of nano-optical imaging for near-field optical detection, in particular to a scattering-type near-field optical microscope to characterize a van der Waals semiconductor layered material with nanometer thickness or a two-dimensional hybrid formed by a heterojunction formed by a van der Waals semiconductor layered material and a metal. A method for real-space characterization of 3D polaritons. Background technique [0002] Optical imaging plays an important role in modern science. However, the spatial resolution of traditional optical imaging technology is limited by the diffraction limit, which cannot solve the research of optical phenomena at the nanometer scale, but can break through the near field of traditional optical diffraction limit. Optical imaging technology can solve this problem. [0003] The spatial resolution of near-field optical imaging is determined by the distance between the sample and the...

AI Technical Summary

Problems solved by technology

However, there are still some defects and deficiencies in the existing technologies: firstly, these technologies are all about the optical local density of states in the detection mode, and the relationship between the optical density of states and the polariton eigenmodes is very complicated and difficult to explain clearly; Secondly, these techniques require the experimental conditions to be in a vacuum, which increases the complexity of the equipment and the difficulty of the experiment.

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