High Q Polarization Independent Guided-Mode Resonance Filter With “Doubly Periodic” Etched Ta$_2$O$_5$ Bidimensional Grating

We experimentally demonstrate, by etching a “doubly periodic” pattern in a high-index material (Ta<sub>2</sub>O<sub>5</sub>), that guided-mode resonance filters can exhibit polarization independent peaks with a <i>Q</i> factor of 5600. Beyond this promising result, complementary characterizations give us some leads to rectify the energy repartition between reflection, transmission, and losses.

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