Design of a polarization insensitive achromatic metalens with a high NA and uniform focusing efficiency based on a double layer structure of silicon and germanium

Jae Won Kim, Young Joo Kim

Research output: Contribution to journalArticlepeer-review

Abstract

A polarization insensitive achromatic metalens (PIAML) was designed to realize a high NA of 0.5 and uniform focusing efficiency in the visible range based on a double layer structure of silicon (Si) and germanium (Ge). Due to their high refractive indices as well as the opposite characteristics of group delay in the visible wavelength, the combination of Si and Ge can contribute to the high NA and achromatic performances. In addition, an isotropic cylindrical unit cell structure was applied to confirm polarization sensitivity. From the finite difference time domain (FDTD) simulation results, it was confirmed that the designed PIAML shows good optical performance of both polarization insensitivity and achromatic performance with uniform focusing efficiency of 27% and high NA of 0.5 in the visible wavelength.

Original languageEnglish
Pages (from-to)1216-1221
Number of pages6
JournalJournal of the Optical Society of America B: Optical Physics
Volume39
Issue number4
DOIs
Publication statusPublished - 2022 Apr

Bibliographical note

Funding Information:
Acknowledgment. This research was supported by the BK21 FOUR (Fostering Outstanding Universities for Research) funded by the Ministry of Education (MOE) of Korea and National Research Foundation (NRF) of Korea.

Funding Information:
Funding. National Research Foundation of Korea (2021M2E7A10 79043); Ministry of Education.

Publisher Copyright:
© 2022 Optica Publishing Group

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics

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