Nonvolatile, Reconfigurable and Narrowband Mid-Infrared Filter Based on Surface Lattice Resonance in Phase-Change Ge(2)Sb(2)Te(5)

We propose a nonvolatile, reconfigurable, and narrowband mid-infrared bandpass filter based on surface lattice resonance in phase-change material Ge [Formula: see text] Sb [Formula: see text] Te [Formula: see text]. The proposed filter is composed of a two-dimensional gold nanorod array embedded in a thick Ge [Formula: see text] Sb [Formula: see text] Te [Formula: see text] film. Results show that when Ge [Formula: see text] Sb [Formula: see text] Te [Formula: see text] transits from the amorphous state to the crystalline state, the narrowband reflection spectrum of the proposed filter is tuned from 3.197 [Formula: see text] m to 4.795 [Formula: see text] m, covering the majority of the mid-infrared regime, the peak reflectance decreases from 72.6% to 25.8%, and the corresponding quality factor decreases from 19.6 to 10.3. We show that the spectral tuning range can be adjusted by varying the incidence angle or the lattice period. By properly designing the gold nanorod sizes, we also show that the quality factor can be greatly increased to 70 at the cost of relatively smaller peak reflection efficiencies, and that the peak reflection efficiency can be further increased to 80% at the cost of relatively smaller quality factors. We expect that this work will advance the engineering of Ge [Formula: see text] Sb [Formula: see text] Te [Formula: see text]-based nonvalatile tunable surface lattice resonances and will promote their applications especially in reconfigurable narrowband filters.