Excitation and Dynamic Tuning of High- Q Resonances with Electromagnetic Coupling Asymmetry
Autor: | Jing-chun Yan, Yong Zhang, Cheng-ping Huang, Xiao-gang Yin |
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Rok vydání: | 2020 |
Předmět: |
Physics
media_common.quotation_subject General Physics and Astronomy Resonance 02 engineering and technology 021001 nanoscience & nanotechnology Lambda 01 natural sciences Molecular physics Asymmetry Q factor Lattice (order) 0103 physical sciences Electromagnetic coupling Transmission intensity 010306 general physics 0210 nano-technology Excitation media_common |
Zdroj: | Physical Review Applied. 14 |
ISSN: | 2331-7019 |
DOI: | 10.1103/physrevapplied.14.054003 |
Popis: | Metasurfaces with in-plane structure asymmetry have been widely explored for realizing high-Q resonances. However, the structure asymmetry parameter, which governs the magnitude of the Q factor, is difficult to modulate directly. This hinders the Q factor from being tuned actively and efficiently. In this paper, a mechanism to excite the high-Q resonance in the in-plane symmetric hole lattice is proposed. The resonance is achieved by use of two perforated metasurfaces, where two localized modes in one layer couple differently with a third mode in the other layer, exhibiting an interplane coupling asymmetry. We further show that, by lateral displacement of one metasurface (approximately \ensuremath{\lambda}/20), the electromagnetic coupling asymmetry can be manipulated. The high-Q resonance can thus be switched on or off and tuned dynamically, leading to efficient modulation of the transmission intensity, the Q factor, etc. The results open a way for excitation and dynamic tuning of the high-Q resonance. |
Databáze: | OpenAIRE |
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