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Athermalized super lens and design method thereof

A design method and metalens technology, applied in the field of optics, can solve problems such as the failure to improve the imaging performance of the metalens, and achieve the effect of improving temperature drift

Active Publication Date: 2022-04-26
SHENZHEN METALENX TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the technical problem that the existing technology cannot improve the imaging performance of the metalens caused by temperature drift, and to fill the gap of the athermalized metalens, the embodiment of the present application provides an athermalized metalens and its design method

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  • Athermalized super lens and design method thereof
  • Athermalized super lens and design method thereof
  • Athermalized super lens and design method thereof

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Embodiment 1

[0097]Exemplarily, an embodiment of the present application provides an athermalized metalens, which includes a quartz substrate and an amorphous silicon nanostructure disposed thereon. The athermalized metalens has an aperture of 1mm, a focal length of 2.5mm, and a working wavelength of 940mm in the near infrared. The material of the nanostructure is amorphous silicon, the height is 500nm, and regular hexagons are arranged as superstructure units. The period of the regular hexagon is 450nm, and the nanostructures are located at the vertices of the regular hexagon. The low temperature threshold of the working environment of the athermalized metalens is -20°C, and the high temperature threshold is 100°C.

[0098] The temperature drift analysis of the athermalized metalens in the 940nm band is as follows.

[0099] Since the operating wavelength is 940nm, the temperature coefficient of refractive index of amorphous silicon is 3x10 -4 / K. Therefore, the refractive indices of t...

Embodiment 2

[0102] Exemplarily, an embodiment of the present application provides another athermalized metalens, including a quartz substrate and a nanostructure disposed thereon. The athermalized metalens has an aperture of 1mm, a focal length of 2.5mm, and a working wavelength of 940mm in the near infrared. The materials of the nanostructure along the direction away from the substrate are sapphire and barium fluoride (see Table 1 for parameters). Calculated according to the formula (1), the height of the barium fluoride in the nanostructure is 715nm, and the height of the sapphire is 785nm. In Example 2, the nanostructures are arranged with regular hexagons as superstructure units. The period of the regular hexagon is 550nm, and the nanostructures are located at the vertices of the regular hexagon. The low temperature threshold of the working environment of the athermalized metalens is -20°C, and the high temperature threshold is 100°C.

[0103] The temperature drift analysis of the ...

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Abstract

The invention provides an athermalized super lens, and belongs to the technical field of optics. The athermalized super lens comprises a substrate and nano structures periodically arranged on at least one side of the substrate, wherein the refractive index temperature coefficient of the nanostructure is smaller than a reference refractive index temperature coefficient; or the nanostructure is composed of at least two materials, and the product of refractive index temperature coefficients of the at least two materials is smaller than zero. According to the athermalized superlens, the refractive index temperature coefficient of the nanostructure is smaller than the reference refractive index temperature coefficient, or the nanostructure is composed of at least two materials with the product of the refractive index temperature coefficients smaller than zero, so that the effective refractive index of the nanostructure is insensitive to temperature changes, and the problem that the imaging performance of the superlens is reduced due to temperature drift is solved.

Description

technical field [0001] The present application relates to the field of optical technology, in particular, to an athermalized metalens and a design method thereof. Background technique [0002] Usually, when designing an optical system, only a single environment of 20°C is temperature tested. However, when the optical system is used in a large temperature range, the thermal expansion and contraction of the lens barrel material, the optical material, and the temperature refractive index coefficient of the optical material will change the focal power of the lens and cause defocusing, resulting in a decrease in image quality. Difference. This phenomenon is also called temperature drift. Lenses that can overcome the effects of temperature drift are called athermalized lenses. [0003] In the related art, the problem of temperature drift of traditional lenses is solved by the mutual cooperation between optical materials with different temperature coefficients of refractive inde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B3/08G02B1/00G02B27/00
CPCG02B3/08G02B1/002G02B27/0012
Inventor 郝成龙谭凤泽朱瑞朱健
Owner SHENZHEN METALENX TECH CO LTD
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