Scattering analysis and efficiency optimization of dielectric pancharatnam-berry-phase metasurfaces

Chen Yi Yu, Qiu Chun Zeng, Chih Jen Yu, Chien Yuan Han, Chih Ming Wang

研究成果: 雜誌貢獻期刊論文同行評審

4 引文 斯高帕斯(Scopus)

摘要

In this study, the phase modulation ability of a dielectric Pancharatnam-Berry (PB) phase metasurface, consisting of nanofins, is theoretically analyzed. It is generally considered that the optical thickness of the unit cell of a PB-phase metasurface is λ/2, i.e., a half-waveplate for polarization conversion. It is found that the λ/2 is not essential for achieving a full 2π modulation. Nevertheless, a λ/2 thickness is still needed for a high polarization conversion efficiency. Moreover, a gradient phase metasurface is designed. With the help of the particle swarm optimization (PSO) method, the wavefront errors of the gradient phase metasurface are reduced by fine-tuning the rotation angle of the nanofins. The diffraction efficiency of the gradient phase metasurface is thus improved from 73.4% to 87.3%. This design rule can be utilized to optimize the efficiency of phase-type meta-devices, such as meta-deflectors and metalenses.

原文???core.languages.en_GB???
期刊Nanomaterials
11
發行號3
DOIs
出版狀態已出版 - 3月 2021

指紋

深入研究「Scattering analysis and efficiency optimization of dielectric pancharatnam-berry-phase metasurfaces」主題。共同形成了獨特的指紋。

引用此