Design of an all-dielectric long-wave infrared wide-angle metalens

doi:10.1088/1674-1056/ac4026

Abstract Optical metasurfaces are two-dimensional arrays of nano-scatterers that modify optical wavefronts at subwavelength spatial resolution. They achieve the effect of focusing through phase control under a subwavelength scale, and are called metalenses. They are poised to revolutionize optics by enabling complex low-cost systems. However, there are severe monochromatic aberrations in the metasurfaces. In this paper, the coma of the long-wave infrared optical system is eliminated through a single-layer metasurface. By changing the phase function, this metalens has a numerical aperture of 0.89, a focal length of 150 μm and a field of view of 120° (0.4@60 line pairs/mm) that enables diffraction-limited monochromatic imaging along the focal plane at a wavelength of 10.6 μm. The designed metasurface maintains a favorable value of the modulation transfer function at different angles. This equipment can be widely used in imaging and industrial processing.

Keywords: long-wave infrared all-dielectric metasurface aberrations metalens

Received: 30 August 2021
Revised: 30 November 2021
Accepted manuscript online: 05 December 2021

PACS:	42.15.Fr	(Aberrations)
	42.79.Bh	(Lenses, prisms and mirrors)
	95.85.Hp	(Infrared (3-10 μm))
	51.70.+f	(Optical and dielectric properties)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61875087) and Innovation and Development Foundation of China Academy of Engineering Physics (Grant No. CX20200021).

Corresponding Authors: Xin Ye, Liming Yang
E-mail: yexin@caep.cn;group_ye@163.com

Cite this article:

Ning Zhang(张宁), Qingzhi Li(李青芝), Jun Chen(陈骏), Feng Tang(唐烽),Jingjun Wu(伍景军), Xin Ye(叶鑫), and Liming Yang(杨李茗) Design of an all-dielectric long-wave infrared wide-angle metalens 2022 Chin. Phys. B 31 074212

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