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Medium-infrared filter based on medium super surface

A metasurface and filter technology, applied in instruments, optical filters, optics, etc., can solve problems such as inability to accurately achieve target positioning, and achieve obvious out-of-band suppression effects, good filtering performance, and easy control effects

Inactive Publication Date: 2018-10-23
DONGGUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When there is strong radiation infrared interference, especially for attacking ground tanks and armored targets with complex infrared backgrounds, but this method will produce large errors and cannot accurately achieve target positioning

Method used

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  • Medium-infrared filter based on medium super surface
  • Medium-infrared filter based on medium super surface
  • Medium-infrared filter based on medium super surface

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Such as figure 1 The metasurface filter structure shown is composed of several unit structures. The resonator adopts a cylindrical structure, which has the advantages of high symmetry and polarization-independent characteristics for incident light. The height of the upper silicon cylinder array is h=0.5μm, the geometric control parameter is diameter d, the bottom layer of calcium fluoride is mid-infrared high transmittance material, the refractive index n=1.4, and the absorption is almost zero.

[0019] The FDTD algorithm is used for simulation calculation, and the boundary conditions are set as follows: the x and y directions are periodic boundary conditions, and the z direction is a scattering boundary condition, which can be obtained through numerical simulation optimization. When the periodic lattice constant is p = 2.2 μm, the filter corresponds to The wo...

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Abstract

The invention provides a medium-infrared filter based on a medium super-surface. The product comprises an array layer and a substrate layer, the array layer is a dielectric resonator array layer, andthe array layer is an array composed of a plurality of unit nano-antennas, and the array is periodically arranged in a two-dimensional lattice and has symmetry for the x-axis and the y-axis, the unitnano-antenna is a cylindrical dielectric resonator, and the thickness h of the array layer is 0.4 [mu]m to 0.5 [mu]m; the diameter of the unit nano-antenna d is smaller than the periodic lattice constant p of the base layer, and the diameter d is smaller than the wavelength corresponding to the unit nano-antenna; the base layer is a mid-infrared high-permeability medium base layer. The device works in the mid-infrared band, and the overall thickness of the system is less than the working wavelength. The device all employs medium-infrared low-loss materials, which are highly efficient. For normal incident electromagnetic waves, the reflectivity exceeds 95%; by adjusting the geometric parameters of the structure, any regulation of the operating wavelength of the device can be achieved.

Description

technical field [0001] The invention relates to the technical field of optical devices, in particular to a metasurface control device. Background technique [0002] In the military field, infrared anti-jamming has always been one of the important applications. For example, infrared missiles regard the attacked target as a point source, and use modulation discs or conical scanning, nutation scanning, etc. to modulate the point source signal in phase, frequency, amplitude, pulse width, etc., to obtain the target's azimuth information . When there is strong radiation infrared interference, especially for attacking ground tanks and armored targets with complex infrared backgrounds, this method will produce large errors and cannot accurately achieve target positioning. Since the interference signal itself cannot be completely eliminated during the positioning process, it is necessary to adopt appropriate methods to increase the anti-interference characteristics of the system, s...

Claims

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Application Information

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IPC IPC(8): G02B5/20G02B1/00
CPCG02B1/002G02B5/208
Inventor 沈飞郭忠义郭凯周红平周清峰田丽华
Owner DONGGUAN UNIV OF TECH
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