CN-116466415-B - Flat plate structure based on topological photonic crystal and infrared sensor

CN116466415BCN 116466415 BCN116466415 BCN 116466415BCN-116466415-B

Abstract

The application provides a flat plate structure based on a topological photonic crystal, which comprises a plurality of superunits, wherein the superunits are arranged in an array mode along a first direction and a second direction and form a matrix, the superunits comprise a topological non-trivial structure and a topological trivial structure, the topological non-trivial structure is arranged on the periphery side of the topological non-trivial structure in a surrounding mode, the topological non-trivial structure comprises a plurality of topological non-trivial units, the topological non-trivial units are arranged in the array mode along the first direction and the second direction and form the matrix, the topological trivial structure comprises a plurality of topological trivial units, and the topological trivial units form the matrix. The application also provides an infrared sensor, which comprises a flat plate structure and a sensor body, wherein the flat plate structure is arranged on the sensor body. The planar structure based on the topological photonic crystal provided by the application has the advantages that the topological corner state can interact with air, so that the resonance characteristic of the topological corner state is sensitive to the refractive index of the environment.

Inventors

ZHANG ZHAOJIAN
YANG JUNBO
CHEN HUAN
ZHANG ZHENFU
DU TE
JIANG XINPENG

Assignees

中国人民解放军国防科技大学

Dates

Publication Date: 20260512
Application Date: 20230414

Claims (9)

1. A topological photonic crystal based slab structure comprising: The super-unit comprises a topological non-trivial structure and a topological trivial structure, wherein the topological non-trivial structure is arranged on the outer periphery side of the topological non-trivial structure in an enclosing mode, the topological non-trivial structure comprises a plurality of topological non-trivial units, the topological non-trivial units are arranged in the first direction and the second direction in an array mode and form a matrix, the topological non-trivial structure comprises a plurality of topological trivial units, the topological non-trivial units form a matrix, each four topological non-trivial units enclose a first air hole, and each topological non-trivial unit is provided with a second air hole.
2. The topological photonic crystal based slab structure of claim 1, wherein the number of topological non-trivial units is set to nine and the number of topological trivial units is set to sixteen.
3. The topological photonic crystal based slab structure of claim 1, wherein a matrix formed by a plurality of said topologically non-trivial cells is arranged as a square and a matrix formed by a plurality of said topologically trivial cells is arranged as a square.
4. The slab structure based on topological photonic crystals of claim 1, wherein the topological non-trivial unit comprises a first body and a second body fixedly connected to the first body, the first body and the second body are crossed and distributed, and four groove bodies are formed, wherein each adjacent four groove bodies enclose to form the first air hole.
5. The topological photonic crystal based slab structure of claim 1, wherein the cross sections of the first air holes and the second air holes perpendicular to the third direction are arranged in a square or a circle.
6. The slab structure based on topological photonic crystals as set forth in any one of claims 1,4, and 5, wherein the first air holes and the second air holes have a cross-sectional side length perpendicular to the third direction of 1.37 micrometers to 1.39 micrometers, and the first air holes and the second air holes have a cross-sectional diameter perpendicular to the third direction of 1.37 micrometers to 1.39 micrometers.
7. The topologically distinct photonic crystal-based slab structure of any of claims 1-5, wherein the lattice constant of said topologically distinct units and the lattice constant of said topologically distinct units are each 2.03 microns.
8. The topologically photon crystal based slab structure of any of claims 1-5 wherein the thickness of said topologically non-trivial elements in the third direction and the thickness of said topologically trivial elements in the third direction are each 4.2 microns to 4.3 microns.
9. An infrared sensor comprising a planar structure according to any one of claims 1-8 and a sensor body, said planar structure being provided in said sensor body.

Description

Flat plate structure based on topological photonic crystal and infrared sensor Technical Field The invention belongs to the technical field of photoelectricity, and particularly relates to a flat plate structure based on a topological photonic crystal and an infrared sensor. Background Photonic crystals introduce the concept of a photonic band by mimicking the periodic potential brought about by atoms in a solid by introducing a periodic dielectric constant. Through photon forbidden band, the photonic crystal can construct a waveguide and microcavity structure, realize light transmission and local area under microscale, and can be applied to on-chip integrated optical circuits and devices. As the integration of topological photonic systems continues to increase, the spacing between topological waveguides (microcavities) will inevitably be reduced, which will result in mode field coupling between optical topological states by means of evanescent fields, thereby altering some of the physical properties of the topological states. And related work based on photonic crystal topology is mostly focused on realizing on-chip optical device application, namely, the introduction, transmission and processing of optical waveguide modes are realized from in-plane. In the related technical field, due to different arrangement modes of the topological photonic crystals, a flat plate structure formed by the topological photonic crystals is insensitive to the change of the refractive index of the environment, so that the application range of the topological photonic crystals is reduced. Disclosure of Invention The embodiment of the application aims to provide a flat plate structure based on a topological photonic crystal and an infrared sensor, so as to solve the technical problem that the topological photonic crystal is insensitive to the change of the refractive index of the environment in the prior art. In order to achieve the above purpose, the technical scheme adopted by the application is to provide a flat plate structure based on topological photonic crystals, which comprises the following components: the super-unit comprises a topological non-trivial structure and a topological trivial structure, wherein the topological non-trivial structure is arranged on the outer periphery side of the topological non-trivial structure in an array mode along a first direction and a second direction and forms a matrix, the topological non-trivial structure comprises a plurality of topological non-trivial units, the topological non-trivial units are arranged in the array mode along the first direction and the second direction and form the matrix, and the topological trivial structure comprises a plurality of topological trivial units and the topological trivial units form the matrix. Optionally, the number of topologically non-trivial units is set to nine and the number of topologically trivial units is set to sixteen. Alternatively, the matrix formed by the plurality of topologically non-trivial cells is arranged as a square, and the matrix formed by the plurality of topologically trivial cells is arranged as a square. Optionally, a first air hole is formed around each four topological non-trivial units, and a second air hole is formed in each topological non-trivial unit. Optionally, the topological non-trivial unit comprises a first main body and a second main body, wherein the second main body is fixedly connected to the first main body, the first main body and the second main body are distributed in a crossed mode, four groove bodies are formed, and each adjacent four groove bodies enclose to form the first air hole. Alternatively, the cross sections of the first air holes and the second air holes perpendicular to the third direction are arranged in a square or a circle. Optionally, the side length of the cross section of the first air hole and the second air hole perpendicular to the third direction is 1.37 micrometers-1.39 micrometers, and the diameter of the cross section of the first air hole and the second air hole perpendicular to the third direction is 1.37 micrometers-1.39 micrometers. Optionally, the lattice constant of the topologically non-trivial cell and the lattice constant of the topologically trivial cell are both 2.03 microns. Optionally, the thickness of the topologically non-trivial units in the third direction and the thickness of the topologically trivial units in the third direction are both 4.2-4.3 microns. The embodiment of the application also provides an infrared sensor, which comprises the flat plate structure and a sensor body, wherein the flat plate structure is arranged on the sensor body. The flat plate structure based on the topological photonic crystal has the beneficial effects that: according to the planar structure based on the topological photonic crystal, different photonic crystal unit configurations are utilized to enable the superunits to be provided with topological non-trivial units and