Abstract
We present a guided mode resonance grating that exhibits high-Q resonances with highly selective directional absorption around 3.7 μm. The grating is designed to create slow guided mode resonances with near-flat dispersion relation. Weakly coupled resonators enable such resonances with small dispersion characteristics. We study the dynamic control of directional absorption using the design presented. We show that weaker dispersion of resonance frequency allows a strong sensitivity concerning the directionality of resonance. Our results indicate that the directionality of absorption can be tuned from normal incidence (0°) to approximately 35° upon small index perturbation. The design presents a pathway toward tunable directional absorption and emission.
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