利用表面图案转换布洛赫表面波的导模。

Converting the guided-modes of Bloch surface waves with surface pattern.

作者信息

Tang X I, Luo Haoqi, Chen Junxue, Badugu Ramachandram, Wang Pei, Lakowicz Joseph R, Zhang Douguo

机构信息

Institute of Photonics, Department of Optics and Optical Engineering, University of Science and Technology of China Hefei, Anhui, 230026, China.

College of Science, Guilin University of Technology, Guilin, Guangxi, 541004, China.

出版信息

J Opt Soc Am B. 2021 May 1;38(5):1579-1585. doi: 10.1364/josab.418106.

DOI:10.1364/josab.418106

PMID:34385758

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8356629/

Abstract

The guided-modes of Bloch surface waves, such as the transverse electric modes (TE00 and TE01 modes), can simultaneously exist in a low-refractive-index ridge waveguide with subwavelength thickness that are deposited on an all dielectric one-dimension photonic crystal. By using the finite difference frequency domain method, coupled mode theory and finite-difference time-domain method, the conversion between the guided-modes has been investigated. This conversion can be realized in a broadband wavelength with surface pattern of this low-index ridge. This conversion is useful for developing lab-on-a-chip photonic devices, such as a mode converter that can maintain the output mode purity over 90% with working wavelength ranging from 590 to 680 nm, and a power splitter that can maintain the splitting ratio over 8:2 with wavelength ranging from 530 to 710 nm.

摘要

布洛赫表面波的导模，如横向电模（TE00和TE01模），可以同时存在于沉积在全介质一维光子晶体上的具有亚波长厚度的低折射率脊形波导中。通过使用有限差分频域法、耦合模理论和有限差分时域法，研究了导模之间的转换。这种转换可以在具有这种低折射率脊表面图案的宽带波长中实现。这种转换对于开发片上实验室光子器件很有用，例如一种模式转换器，在590至680纳米的工作波长范围内可以保持输出模式纯度超过90%，以及一种功率分配器，在530至710纳米的波长范围内可以保持分光比超过8:2。