Tailoring the enhanced transmission and absorption in 1D subwavelength semiconductor-based metamaterial high-contrast gratings (Conference Presentation)

We demonstrate how to tailor the size-dependent enhanced transmission and absorption of 1D subwavelength semiconductor-based metamaterial high contrast gratings. We focus on 3 spectral regimes generic for most semiconductors, where the refractive index (n) and extinction coefficient (k) of the semiconducting material satisfy the following conditions: n >> k, n ~ k and n < k. We show that the transmission into such structures can be enhanced by reducing the bar width, increasing the grating period, or tapering the grating sidewalls. Moreover, thanks to the slow-light phenomenon, the absorption of the grating can be enhanced as compared to bulk semiconductors.