All-dielectric metasurface structure-based efficient infrared optical lens and preparation method thereof

Abstract

The invention discloses an all-dielectric metasurface structure-based efficient infrared optical lens and a preparation method thereof. The all-dielectric metasurface structure-based efficient infrared optical lens comprises a substrate and an all-dielectric metasurface structure; the substrate is made of infrared chalcogenide glass; and the nano-structure units of the all-dielectric metasurface structure are of symmetrical strictures and arranged on the substrate according to a specific phase distribution. The infrared optical lens of the invention has ultra-thin thickness (micron-level thickness), and therefore, focusing ability close to a diffraction limit can be obtained, and high-resolution imaging can be realized; and the highly-symmetrical and highly efficient nano-structure units are adopted, the infrared low-loss chalcogenide glass is adopted as the substrate for supporting the nano-structure units, and therefore, the metasurface lens of the present invention has an efficient focusing effect in infrared bands, especially in far infrared bands.

Description

technical field [0001] The invention belongs to the field of nanophotonics and optical imaging, and in particular relates to a high-efficiency infrared optical lens based on an all-dielectric metasurface structure and a preparation method thereof. Background technique [0002] Infrared imaging lens is a key component of modern scientific and technological products such as infrared thermal imaging system, night vision device, infrared detection system and infrared guidance system. It is widely used in early medical diagnosis, military operations, aerospace, resource exploration, environmental pollution detection, marine Information, forest fires and other fields related to national economy and people's livelihood, the development of high-performance infrared imaging devices based on new materials has far-reaching significance for promoting scientific research, national economic development and national defense construction. Traditional infrared optical imaging systems are mai...

AI Technical Summary

Problems solved by technology

In 2012, the Capasso research group used the plasmonic metasurface to design an imaging lens in the communication band for the first time, and its focusing efficiency was less than 5%.

[0005] From the above studies, it can be seen that high-efficiency imaging lenses have been realized in the visible and near-infrared bands, but in the mid- and far-infrared bands, high-efficiency imaging lenses have not yet been reported.

In addition, due to the low loss of quartz glass at short wavelengths, it is used as a substrate in most researches. However, in the long-wavelength region, especially in the far-infrared band, the loss of quartz glass is very large, so it is necessary to find a suitable material as a substrate

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