Long-wave infrared broadband achromatic metasurface lens

A long-wave infrared and metasurface technology, which is applied in the field of infrared imaging and micro-nano photonics, can solve the problems that broadband light chromatic aberration cannot be eliminated, achieve the effect of optimizing transmittance and focusing efficiency, simplifying the selection process, and ensuring achromatic aberration

Active Publication Date: 2021-03-16
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the defects and improvement needs of the prior art, the present invention provides a long-wave infrared broadband achromatic metasurface lens, the purpos

Method used

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  • Long-wave infrared broadband achromatic metasurface lens
  • Long-wave infrared broadband achromatic metasurface lens
  • Long-wave infrared broadband achromatic metasurface lens

Examples

Experimental program
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Example Embodiment

[0077] Example 1:

[0078] A long-wave infrared broadband chromoine difference, a diameter of 240 μm, a numerical aperture of 0.5, and an arbitrary wavelength in the 8-12 μm operating wavelength range is high efficiency color difference. In this embodiment, the lens rear focal length is 208 μm, and the axial maximum focal length drift is less than 4%, and the three-dimensional indication of the super lens is figure 1 As shown, the two-dimensional structure of the super lens vertical section is shown. figure 2 Indicated.

[0079] In this embodiment, in the present embodiment, the structure of one of the super surface lens units is as image 3 As shown, the microstructure is a silicon column made of silicon material, and the projection pattern of the microstructure in the dielectric substrate is Figure 4 In the concentric circular pattern shown in (c), in this embodiment, the material of the dielectric substrate is BAF2, in the actual application, by depositing a layer of silicon...

Example Embodiment

[0085] Example 2:

[0086] A long-wave infrared broadband colorimeter having a large surface lens having a diameter of 1 mm and a numerical aperture is 0.15. In the present embodiment, the substrate and microstructure array of superlobes are selected from the selection of silicon, and the preparation process of ultradracene is simplified, and the preparation cycle of the ultra-lens is shortened. In design, by scanning a unit having a combination of different cell cycles and silicon column height parameters to obtain a high transmittance window of the ultra-lens unit under the whole silicon material, a unit cycle is 3.5 μm, a height of 8 μm high transmittance dimensional combination. According to the phase and dispersion formula under the parameter of 1 mm, numerical aperture 0.15 parameters, the theoretical distribution of the superlight surface phase - dispersion is obtained.

[0087] The simulation of the phase-dispersion parameter of the microstructure in this example, the opti...

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Abstract

The invention discloses a long-wave infrared broadband achromatic metasurface lens, and belongs to the field of infrared imaging and the field of micro-nano photonics. Metasurface lens units in the metasurface lens are periodically arranged in a tetragonal lattice form; the metasurface lens unit is composed of a dielectric substrate and a microstructure located in the center of the dielectric substrate, and a projection pattern of the microstructure on the dielectric substrate is a graph which is in rotational symmetry about a 90-degree angle; the phase and phase dispersion introduced by the microstructures at different positions meet the following formulas shown as the specification, and the microstructure selection mode at each position is as follows: a theoretical parameter combinationis obtained according to the two formulas, the phase of the unit where each microstructure is located and the corresponding phase dispersion are obtained through weighted first-order linear fitting, and are recorded as actual parameter combinations, the parameter combinations are drawn in a same scatter diagram, and the microstructure corresponding to the actual parameter combination closest to the theoretical parameter combination is selected. According to the invention, broadband achromatism can be realized in a long-wave infrared band.

Description

technical field [0001] The invention belongs to the fields of infrared imaging and micro-nano photonics, and more specifically relates to a long-wave infrared broadband achromatic metasurface lens. Background technique [0002] In traditional infrared optical systems, refractive optical elements such as glass lenses are usually used to achieve imaging. This type of lens realizes the regulation of light through the refraction of the front and rear surfaces. Compared with the overall volume of the lens, the actual working area volume is low in space utilization, resulting in The problem of miniaturization and miniaturization of the optical system is solved. As an emerging sub-wavelength artificial material, metasurfaces can be arbitrarily adjusted to various optical properties such as the amplitude and phase of the incident light through the artificial design of the array unit, resulting in a series of novel physical properties, such as negative refraction. High-efficiency ma...

Claims

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Application Information

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IPC IPC(8): G02B3/00G02B1/00
CPCG02B1/002G02B3/0037
Inventor 易飞邬灏侯铭铭
Owner HUAZHONG UNIV OF SCI & TECH
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