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physics.optics2021
Collimation and finite-size effects in suspended resonant guided-mode gratings
Christian Toft-Vandborg, Alexios Parthenopoulos, Ali Akbar Darki +1
The optical transmission of resonant guided-mode gratings patterned on suspended silicon nitride thin films and illuminated at normal incidence with a Gaussian beam are investigate…
physics.optics2020
Optical spatial differentiation with suspended subwavelength gratings
Alexios Parthenopoulos, Ali Akbar Darki, Bjarke R. Jeppesen +1
We demonstrate first- and second-order spatial differentiation of an optical beam transverse profile using thin suspended subwavelength gratings. Highly reflective one-dimensional…