Exploiting Fabry-Perot and symmetry-protected BICs in multilayered time-varying metasurfaces enables polarization-insensitive scattering anomalies and monochromatic nonreciprocal transmission at perturbative modulation amplitudes.
Effects due to generation of negative frequencies during temporal diffraction
3 Pith papers cite this work. Polarity classification is still indexing.
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abstract
Temporal diffraction from rapidly time-modulated materials can generate new frequency components not present in an incident wave. In such an experiment, the spectral extent of these new frequencies is determined by the rate of modulation relative to the period of the oscillating field. Here we present a temporal diffraction experiment carried out in the far-infrared (THz) spectral region. Using graphene, a fast modulator for this spectral domain, we show that one can modulate the transmission significantly faster than the period of a narrow band THz field. This leads to a large bandwidth for the generated frequencies, including the generation of negative frequency components. We show that interference between negative and positive frequency components give rise to distinctive oscillatory features in the transmitted spectrum.
fields
physics.optics 3years
2026 3representative citing papers
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Bound states in the continuum in multilayered time-varying metasurfaces
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