Photonic crystal super-resolution imaging device with variable period grating

Abstract

The invention relates to a variable-period grating photonic crystal super-resolution imager. There is a gap of the same width between the incident surface of the crystal and the exit surface of the photonic crystal. The equivalent refractive index of the photonic crystal is -1. The number of columns, the point light source enters the photonic crystal after passing through the sub-wavelength grating, and realizes super-resolution imaging that breaks through the diffraction limit. By adding a sub-wavelength grating on the surface of the photonic crystal, the coupling effect of the light field is enhanced, the half-width of the image point is compressed, the imaging resolution is improved and the diffraction limit is broken.

Description

technical field [0001] The invention relates to an imaging technology, in particular to a variable-period grating photonic crystal super-resolution imager. Background technique [0002] The former Soviet scientist Veselego first proposed the concept of "negative refraction" in 1968, and theoretically predicted that in this negative refraction material, the electric field, magnetic field, and wave vector direction no longer conform to the right-hand rule of traditional materials, but obey the left-hand rule, so This material is also called "left-handed material". It is also predicted that in materials with negative permittivity ε and magnetic permeability μ at the same time, negative refraction will occur, that is, the incident wave and outgoing wave are located on the same side of the normal. However, it was not until the beginning of this century that D.R.Smith and others experimentally prepared artificial materials capable of negative refraction. This material is composed...

AI Technical Summary

Problems solved by technology

[0003] However, because photonic crystals do not have both negative permittivity and magnetic permeability, the mechanism of super-resolution imaging is still controversial.

In addition, the resolution of photonic crystal imaging is only slightly smaller than the diffraction limit, and further work is still needed to continue to improve the imaging resolution of photonic crystals

Images