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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Haijie Zuo
  • Duk-Yong Choi
  • Pan Ma
  • Lei Xu
  • Dragomir N. Neshev
  • Baoping Zhang
  • Barry Luther-Davies

Detail(s)

Original languageEnglish
Article number1700585
Journal / PublicationAdvanced Optical Materials
Volume5
Issue number23
Online published23 Oct 2017
Publication statusPublished - 1 Dec 2017
Externally publishedYes

Abstract

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 µm are demonstrated. The metalens is designed using rigorous coupled-wave analysis and is based on hydrogenated amorphous silicon (α-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 120×. 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.

Research Area(s)

  • hydrogenated amorphous silicon (α-Si:H), metasurfaces, mid-infrared imaging

Citation Format(s)

High-Efficiency All-Dielectric Metalenses for Mid-Infrared Imaging. / Zuo, Haijie; Choi, Duk-Yong; Gai, Xin; Ma, Pan; Xu, Lei; Neshev, Dragomir N.; Zhang, Baoping; Luther-Davies, Barry.

In: Advanced Optical Materials, Vol. 5, No. 23, 1700585, 01.12.2017.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review