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Surface-wave coupling in double Floquet sheets supporting phased temporal Wood anomalies
Ya-Wen Tsai1, Yao-Ting Wang2,3, Emanuele Galiffi3
1Department of Material Sciences and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan.
Nanophotonics (Berlin, Germany)
|December 5, 2024
Summary
We demonstrate controlling surface modes in time-modulated double-layer systems using phase differences. This allows efficient, selective excitation and switching of even or odd surface modes with ultrafast temporal modulation.
Area of Science:
- Photonics and Metamaterials
- Surface Physics
- Nonlinear Optics
Background:
- Time-modulated systems offer dynamic control over electromagnetic wave propagation.
- Surface modes (or surface waves) are confined electromagnetic field excitations at interfaces.
- Double-layer structures provide a platform for complex electromagnetic interactions.
Purpose of the Study:
- To investigate symmetry-selective surface-mode excitation in periodically time-modulated double-layer systems.
- To explore the role of phase difference in modulation between layers for mode control.
- To demonstrate efficient switching between distinct surface modes.
Main Methods:
- Derivation of a semi-analytic transfer matrix formalism for a Drude-dispersive double-layer structure with periodic time-modulation.
- Calculation of scattering amplitudes and transmission coefficients.
- Verification using full-wave time-domain simulations.
Main Results:
- The phase difference between the modulations of the two layers is crucial for enhancing and selectively exciting even or odd surface modes.
- High efficiency in exciting specific surface modes is achieved by controlling this phase difference.
- Efficient switching between the two distinct surface-wave modal channels is demonstrated, even with a single off-resonant Gaussian pulse.
Conclusions:
- Phase-controlled temporal modulation in double-layer systems enables ultrafast, symmetry-selective surface-mode excitation.
- This technique offers a pathway for dynamic control and switching of surface waves.
- The findings have implications for advanced photonic devices and signal processing.
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