Reversible optical tuning of GeSbTe phase-change metasurface spectral filters for mid-wave infrared imaging
Version 2 2020-07-01, 23:23
Version 1 2020-07-01, 23:23
Posted on 2020-07-01 - 23:23
Tunable narrowband spectral filtering across arbitrary optical wavebands is highly desirable in a plethora of applications, from chemical sensing, hyperspectral imaging to infrared astronomy. Yet, the ability to reconfigure the optical properties, with full reversibility, of a solid-state large-area narrowband filter remains elusive. Existing solutions require either moving parts, have slow response times or provide limited spectral coverage. Here, we demonstrate a 1-inch diameter continuously tunable, fully reversible, all-solid-state, narrowband phase-change metasurface filter based on a GeSbTe-225 (GST)-embedded plasmonic nanohole array. The passband of the presented devices is ~74 nm with ~70% transmittance and operates across 3–5 µm—the thermal imaging waveband. Continuous, reconfigurable tuning is achieved by exploiting intermediate GST phases via optical switching with a single nanosecond laser pulse and material stability is verified through multiple switching cycles. We further demonstrate multispectral thermal imaging in the mid-wave infrared using our active phase-change metasurfaces. Our results pave the way for highly functional, reduced power, compact hyperspectral imaging systems and customizable optical filters for ‘real-world’ system integration.
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Julian, Matthew; Williams, Calum; Borg, Stephen; Bartram, Scott; Kim, Hyun Jung (2020). Reversible optical tuning of GeSbTe phase-change metasurface spectral filters for mid-wave infrared imaging. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.4903761.v2
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AUTHORS (5)
MJ
Matthew Julian
CW
Calum Williams
SB
Stephen Borg
SB
Scott Bartram
HK
Hyun Jung Kim