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We use a rigorous electromagnetic approach to analyze the fundamental limit of light-trapping enhancement in grating structures. This limit can exceed the bulk limit of 4n2, but has significant angular dependency. We explicitly show that 2D gratings provide more enhancement than 1D gratings. We also show the effects of the grating profile's symmetry on the absorption enhancement limit. Our findings...
We present a temporal coupled-mode theory for the Fano resonance in light scattering by individual obstacle. As an application, we design a structure that exhibits strong absorption and weak scattering properties at the same frequency.
A high-Q optical resonance can be created dynamically, by inducing photonic transition between a localized state and a one-dimensional continuum through refractive index modulation. This mechanism allows for complete control of an optical micro-resonance.
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