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5 March 2021 Phase-change material based actively tunable MWIR thin-film bandpass filters
Hyun Jung Kim, Calum Williams, Matthew Julian, Nina Hong, Stephen Borg
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Proceedings Volume 11682, Optical Components and Materials XVIII; 1168208 (2021) https://doi.org/10.1117/12.2574634
Event: SPIE OPTO, 2021, Online Only
Abstract
Tunable mid-wave infrared (MWIR) filters are highly desirable in a wide variety of imaging and spectroscopic applications; with the waveband containing numerous invaluable spectral absorption signatures. We demonstrate spectrally-tunable, all solid-state, thin-film bandpass filters operating across the MWIR by utilizing the phase-change material (PCM) Ge2Sb2Te5 as a tunable cavity medium between two Bragg mirrors. The induced PCM refractive index modulation increases the cavity’s optical path length, thereby tuning the filter passband. Our filters have 300 nm spectral tunability, ~70% transmission efficiencies, and ~60 nm passbands. We further show multispectral thermal imaging and dynamic CO2 gas plume sensing using the filters.
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Hyun Jung Kim, Calum Williams, Matthew Julian, Nina Hong, and Stephen Borg "Phase-change material based actively tunable MWIR thin-film bandpass filters", Proc. SPIE 11682, Optical Components and Materials XVIII, 1168208 (5 March 2021); https://doi.org/10.1117/12.2574634
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KEYWORDS
Bandpass filters
Mid-IR
Thin films
Tunable filters
Image filtering
Optical filters
Radio optics
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