Tunable two-dimensional optical filter based on guided-mode resonance

In this paper, a tunable, two-dimensional periodic structure based on guided-mode resonance (GMR) is proposed. This element can be employed as a tunable optical filter or a display pixel. Resonance tuning in this device is accomplished through perturbation in the refractive index profile and element's thickness, conceptually by a micro-electro-mechanical system mechanism. Simulation results show that resonance wavelength tunings of ∼48  nm (522-570 nm) and ∼17  nm (526-543 nm) are achieved by physical movement of 166 nm horizontally and 300 nm vertically, respectively. The proposed device can fairly maintain its tunability under ±5° deviations in the angle of incidence.