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Title: Manipulating mode degeneracy for tunable spectral characteristics in multi-microcavity photonic molecules
Authors: Chen, Jian
Hu, Guangwei
Cao, Guangtao
Deng, Yan
Zhou, Lei-ming
Wen, Zhengji
Yang, Hui
Li, Guanhai
Chen, Xiaoshuang
Issue Date: 25-Mar-2021
Publisher: The Optical Society
Citation: Chen, Jian, Hu, Guangwei, Cao, Guangtao, Deng, Yan, Zhou, Lei-ming, Wen, Zhengji, Yang, Hui, Li, Guanhai, Chen, Xiaoshuang (2021-03-25). Manipulating mode degeneracy for tunable spectral characteristics in multi-microcavity photonic molecules. Optics Express 27 (9) : 11181-11193. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: Optical microcavities are capable of confining light to a small volume, which could dramatically enhance the light-matter interactions and hence improve the performances of photonic devices. However, in the previous works on the emergent properties with photonic molecules composed of multiple plasmonic microcavities, the underlying physical mechanism is unresolved, thereby imposing an inevitable restriction on manipulating degenerate modes in microcavity with outstanding performance. Here, we demonstrate the mode-mode interaction mechanism in photonic molecules composed of degenerate-mode cavity and single-mode cavity through utilizing the coupled mode theory. Numerical and analytical results further elucidate that the introduction of direct coupling between the degenerate-mode cavity and single-mode cavity can lift the mode degeneracy and give rise to the mode splitting, which contributes to single Fano resonance and dual EIT-like effects in the double-cavity photonic molecule structure. Four times the optical delay time compared to typical double-cavity photonic molecule are achieved after removing the mode degeneracy. Besides, with the preserved mode degeneracy, ultra-wide filtering bandwidth and high peak transmission is obtained in multiple-cavity photonic molecules. Our results provide a broad range of applications for ultra-compact and multifunction photonic devices in highly integrated optical circuits. © 2021 OSA - The Optical Society. All rights reserved.
Source Title: Optics Express
ISSN: 1094-4087
DOI: 10.1364/oe.420462
Rights: Attribution 4.0 International
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