Abstract

An efficient and accurate technique for evaluating the characteristics of a polarization converter consisting of a dielectric waveguide with a single asymmetric section is proposed and discussed with the aid of the imaginary-distance beam-propagation method. Detailed consideration regarding the optical-axis rotation angle reveals the necessity and effectiveness of introducing the excitation efficiency of the two hybrid eigenmodes of the asymmetric section. This enables us to assess the incident mode dependence, which cannot be done by the conventional rotation angle. We derive concise formulas regarding the polarization extinction ratio and the insertion loss using the hybrid eigenmodes. It is found that the present formulas provide reasonable results, showing a good agreement with the results obtained from a time-consuming FDTD simulation.

Dual-band terahertz polarization converter with high-efficiency asymmetric transmission

Jiu-Sheng Li and Feng-Qing Bai
Opt. Mater. Express 10(8) 1853-1861 (2020)

Compact nonvolatile polarization switch using an asymmetric Sb₂Se₃-loaded silicon waveguide

Huimin Jin, Lei Niu, Jiajiu Zheng, Peipeng Xu, and Arka Majumdar
Opt. Express 31(6) 10684-10693 (2023)

Designing high efficiency asymmetric polarization converter for blue light: a deep reinforcement learning approach

Chuqiao Yi, Zhiwei Chen, Yayu Gao, and Qingguo Du
Opt. Express 30(6) 10032-10049 (2022)

High-efficiency ultrasmall polarization converter in InP membrane

Josselin Pello, Jos van der Tol, Shahram Keyvaninia, René van Veldhoven, Huub Ambrosius, Gunther Roelkens, and Meint Smit
Opt. Lett. 37(17) 3711-3713 (2012)

Ultracompact polarization converter with a dual subwavelength trench built in a silicon-on-insulator waveguide

Aitor V. Velasco, María L. Calvo, Pavel Cheben, Alejandro Ortega-Moñux, Jens H. Schmid, Carlos Alonso Ramos, Íñigo Molina Fernandez, Jean Lapointe, Martin Vachon, Siegfried Janz, and Dan-Xia Xu
Opt. Lett. 37(3) 365-367 (2012)