Optical performance of synthetic aperture metalens based on hybrid unit-cells

Chen Yi Yu, Yen Chun Chen, Qiu Chun Zeng, Wei Lun Hsu, Chih Ming Wang

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

In this paper, we introduce a metalens with a hybrid unit-cell arrangement that operates at a wavelength of 0.94 μm. The metalens consists of 0.8 μm unit-cells on the inner and 0.4 μm unit-cells on the outer. The transmittance of 0.8 μm and 0.4 μm unit-cells are about 0.5 and 1, respectively. Therefore, the proposed metalens with hybrid unit-cells, behaving like a synthetic aperture lens, suppresses the low spatial frequency signal and enhances the high spatial frequency one. As a result, the proposed metalens with hybrid unit-cells presents a higher spatial resolution than that with an identical unit-cell size and holds higher transmittance than that of a conventional synthetic aperture lens. Moreover, we comprehensively discuss the optical performance and limitations of pixelate metalens and expand the application prospects of synthetic aperture metalenses in optical imaging.

Original languageEnglish
Article number107982
JournalMaterials Science in Semiconductor Processing
Volume170
DOIs
StatePublished - Feb 2024

Keywords

  • Metalens
  • Super-oscillatory lens
  • Synthetic aperture lens

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