High-efficiency SOI-based metalenses at telecommunication wavelengths

Taesu Ryu, Moohyuk Kim, Yongsop Hwang, Myung Ki Kim, Jin Kyu Yang

Research output: Contribution to journalArticlepeer-review

Abstract

We demonstrated silicon-on-insulator (SOI)-based high-efficiency metalenses at telecommunication wavelengths that are integrable with a standard 220 nm-Thick silicon photonic chip. A negative electron-beam resist (ma-N) was placed on top of the Si nanodisk, providing vertical symmetry to realize high efficiency. A metasurface with a Si/ma-N disk array was numerically investigated to design a metalens that showed that a Si/ma-N metalens could focus the incident beam six times stronger than a Si metalens without ma-N. Metalenses with a thick ma-N layer have been experimentally demonstrated to focus the beam strongly at the focal point and have a long depth of field at telecommunication wavelengths. A short focal length of 10 μm with a wavelength-scale spot diameter of approximately 2.5 μm was realized at 1530 nm. This miniaturized high-efficiency metalens with a short focal length can provide a platform for ultrasensitive sensors on silicon photonic IC.

Original languageEnglish
Pages (from-to)4697-4704
Number of pages8
JournalNanophotonics
Volume11
Issue number21
DOIs
Publication statusPublished - 2022 Dec 1

Keywords

  • metalens
  • metasurface
  • silicon photonics

ASJC Scopus subject areas

  • Biotechnology
  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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