High-Efficiency All-Dielectric Metalenses for Mid-Infrared Imaging

被引：100

作者：

Zuo, Haijie ^{[1
,2
]}

Choi, Duk-Yong ^{[1
]}

Gai, Xin ^{[1
]}

Ma, Pan ^{[1
]}

Xu, Lei ^{[3
]}

Neshev, Dragomir N. ^{[3
]}

Zhang, Baoping ^{[2
]}

Luther-Davies, Barry ^{[1
]}

机构：

[1] Australian Natl Univ, Res Sch Phys & Engn, Laser Phys Ctr, Ctr Ultrahigh Bandwidth Devices Opt Syst, Canberra, ACT 2601, Australia

[2] Xiamen Univ, Dept Elect Engn, Lab Micro Nano Optoelect, Xiamen 361005, Fujian, Peoples R China

[3] Australian Natl Univ, Res Sch Phys & Engn, Nonlinear Phys Ctr, Canberra, ACT 2601, Australia

来源：

ADVANCED OPTICAL MATERIALS | 2017年 / 5卷 / 23期

基金：

澳大利亚研究理事会;

关键词：

hydrogenated amorphous silicon (alpha-Si:H); metasurfaces; mid-infrared imaging; WAVE-FRONT CONTROL; SUBWAVELENGTH GRATINGS; VISIBLE WAVELENGTHS; HIGH-TRANSMISSION; METASURFACE; POLARIZATION; LENSES; RESOLUTION; PHASE;

D O I：

10.1002/adom.201700585

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Metasurfaces-based flat optics, which can make use of existing foundry planar technology for high-throughput production, allows the arbitrary control of the wavefront and polarization of light within subwavelength thick structures. So far, however, flat optics for the mid-infrared (MIR) has received far less attention than devices operating at visible or near-infrared wavelengths. Here, polarization-insensitive, highly efficient, all-dielectric metalenses operating in the MIR around 4 mu m are demonstrated. The metalens is designed using rigorous coupled-wave analysis and is based on hydrogenated amorphous silicon (alpha-Si:H) nanopillars supported by an MgF2 substrate. The metalenses produce close to a diffraction-limited focal spot and can resolve structures on the wavelength scale where the focusing efficiency reaches 78% at a magnification of 120x. The imaging qualities are comparable with commercial bulk-molded chalcogenide aspheric lenses. These results provide novel solutions for existing MIR technology and nurture new functionalities with the population of miniaturized and planarized optoelectrical devices.

引用

页数：6