Tightly focusing metalens based on the high order Bessel function

Zhaojin Guo, Xuanguang Wu, Liang Zhou, Yanke Li, Bingyan Wei, Dandan Wen, Peng Li, Jianlin Zhao, Sheng Liu

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We propose a new, to the best of our knowledge, type of metalens of which the phase profile is extracted from the higher-order Bessel function. A light beam passing through this metalens would focus along the circular trajectory and produces a tightly focusing field. Utilizing phase binarization, we provide a method to design the geometric-phase dielectric metasurface both for phase and polarization modulations. We demonstrate two metalenses for circularly and radially polarized output beams at 633 nm, with the measured 0.737λ and 0.616λ focal spots, respectively. Theoretically, it can realize a super-diffraction-limit spot (0.38λ).

optical devices.

Original languageEnglish
Pages (from-to)2573-2576
Number of pages4
JournalOptics Letters
Volume49
Issue number10
DOIs
StatePublished - 15 May 2024

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