| Autor: |
Li-Ting Wu, Jia-Qi Yuan, Tianjing Guo, Ming Kang, Bo Zhao, Jing Chen, Lin-Shan Sun |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Optics Express. 29:24663 |
| ISSN: |
1094-4087 |
| DOI: |
10.1364/oe.432105 |
| Popis: |
We investigate the optical resonances in coupled meta-atoms with hybrid interaction pathways. One interaction pathway is the directly near-field coupling between the two meta-atoms. The other interaction pathway is via the continuum in a waveguide functioned as a common bus connecting them. We show that by properly introducing gain or loss into the meta-atoms, the hybrid optical system becomes parity-time ( P T ) symmetric, in which the effective coupling rate can be customized by manipulating the length of the waveguide. At the exact phase of the customized P T symmetry, the coupled meta-atoms support discrete super-resonant modes that can be observed from the transmission spectra as extremely sharp peaks. At an exception point where the eigenmodes coalesce, albeit the transmission curve is flat, a high-Q factor of the localized field in the meta-atoms can be obtained. Similarities of the super-resonance with the bound states in the continuum (BICs) are discussed. This investigation promotes our understanding about the ways in realizing high-Q optical resonance especially by manipulating the distributions of loss and gain via the concepts of P T and BICs. Many attractive applications are expected. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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