Photonic crystal defect mode with maximum chirality at exceptional point

Pi-Ju Cheng; Chao-Chieh Cheng; Tzu-Wei Huang; Wei-Ting Wang; Jui-Tse Tsai; Min-Hsiung Shih; Shu-Wei Chang

doi:10.1117/12.2676187

4 October 2023 Photonic crystal defect mode with maximum chirality at exceptional point

Pi-Ju Cheng, Chao-Chieh Cheng, Tzu-Wei Huang, Wei-Ting Wang, Jui-Tse Tsai, Min-Hsiung Shih, Shu-Wei Chang

Proceedings Volume 12647, Active Photonic Platforms (APP) 2023; 126470D (2023) https://doi.org/10.1117/12.2676187
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

Abstract

We demonstrate circularly-polarized-like modes with maximum chirality at the exceptional point (EP) of a photonic crystal (PhC) defect cavity. Reaching the EP requires a fine balance between the loss/gain and dielectric perturbation and a high consistency between fabrications and designs. In this work, we use the tunneling loss that can be controlled by the number of removed air holes in the PhC to induce the EP. By removing and repositioning the hole blocks, we make the EP insensitive to uncertainties in fabrications and improve the chirality of radiation field. Our results promote coherent chiral light sources at the chip level without auxiliary non-Hermitian and chiral structures.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Pi-Ju Cheng, Chao-Chieh Cheng, Tzu-Wei Huang, Wei-Ting Wang, Jui-Tse Tsai, Min-Hsiung Shih, and Shu-Wei Chang "Photonic crystal defect mode with maximum chirality at exceptional point", Proc. SPIE 12647, Active Photonic Platforms (APP) 2023, 126470D (4 October 2023); https://doi.org/10.1117/12.2676187

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