Integration of a waveguide resonator can reduce an aperture of a grating coupler to enable its utilization in a channel waveguide. Resultantly obtained coupling characteristics such as selectivity or controllability are attractive for various applications including a compact WDM light source and micro-optic beam steering.
Nonmagnetic nonreciprocal linear optical response is predicted for acoustically driven resonant waveguide gratings. In a narrow spectral range around the resonance the structure can be completely transparent for a light wave propagating in one direction and highly reflective in the opposite direction.
The long-wave IR spectral region spanning ~3 to 13 μm contains spectral bands useful for many scientific and industrial applications. We discuss design, fabrication, and testing of example devices based on guided-mode resonant metamaterials.
A nonreciprocal graphene grating based on temporal modulation is presented. Only three distinct modulation regions are necessary, relaxing the fabrication requirements. Simulations show very large isolation with moderate insertion loss, making the structure suitable for THz applications.
We study quasi-bound states in the continuum with diverging resonance lifetime and vanishing resonant linewidth in a novel double-sided grating metamaterial. With rigorous computations, we corroborate that specific physical conditions are required to obtain the diverging resonance quality factor.