Surface-wave coupling in double Floquet sheets supporting phased temporal Wood anomalies.
| Autor: | Tsai YW; Department of Material Sciences and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan., Wang YT; Department of Mathematics, Imperial College London, London SW7 2AZ, UK.; Photonics Initiative, Advanced Science Research Center, City University of New York, New York, NY 10031, USA., Galiffi E; Photonics Initiative, Advanced Science Research Center, City University of New York, New York, NY 10031, USA., Alù A; Photonics Initiative, Advanced Science Research Center, City University of New York, New York, NY 10031, USA.; Physics Program, Graduate Center of the City University of New York, New York, NY 10016, USA., Yen TJ; Department of Material Sciences and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan. |
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| Jazyk: | angličtina |
| Zdroj: | Nanophotonics (Berlin, Germany) [Nanophotonics] 2022 Jul 11; Vol. 11 (15), pp. 3509-3517. Date of Electronic Publication: 2022 Jul 11 (Print Publication: 2022). |
| DOI: | 10.1515/nanoph-2022-0253 |
| Abstrakt: | We investigate symmetry-selective surface-mode excitation in a general periodically time-modulated double-layer system, where the modulation of the two layers has a constant phase difference. By deriving a semi-analytic transfer matrix formalism of a Drude-dispersive double-layer structure with periodic time-modulation, we calculate the scattering amplitudes and the corresponding transmission coefficient. Our results show that the phase-difference between the modulation of the two sheets plays an essential role in significantly enhancing and selectively exciting either the even or odd surface mode with high efficiency. We verify our calculations with full-wave time-domain simulations, showing that efficient switching between the surface-wave excitation of the two distinct modal channels can be achieved, even under illumination from a single off-resonant Gaussian pulse, by controlling the phase difference between the two modulations. Our results pave the way towards ultrafast, symmetry-selective mode excitation and switching via temporal modulation. (© 2022 the author(s), published by De Gruyter, Berlin/Boston.) |
| Databáze: | MEDLINE |
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