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We propose a nonvolatile, reconfigurable, and narrowband mid-infraredbandpass filter based on surface lattice resonance in phase-change materialGe2Sb2Te5 (GST). The proposed filter is composed of a two-dimensional goldnanorod array embedded in a thick GST film. Results show that when GST transitsfrom the amorphous state to the crystalline state, the narrowband reflectionspectrum of the proposed filter is tuned from 3.197 {\mu}m to 4.795 {\mu}m,covering the majority of the mid-infrared regime, the peak reflectancedecreases from 72.6% to 25.8%, and the corresponding Q-factor decreases from19.6 to 10.3. We show that the spectral tuning range can be adjusted by varyingthe incidence angle or the lattice period. By properly designing the goldnanorod sizes, we also show that the Q-factor can be greatly increased to 70 atthe cost of relatively smaller peak reflection efficiencies, and that the peakreflection efficiency can be further increased to 80% at the cost of relativelysmaller Q-factors. We expect this work will advance the engineering ofGST-based nonvalatile tunable surface lattice resonances and will promote theirapplications especially in reconfigurable narrowband filters.

Nonvolatile, reconfigurable and narrowband mid-infrared filter based on surface lattice resonance in phase-change GeSbTe