Reversible optical tuning of GeSbTe phase-change metasurface spectral filters for mid-wave infrared imaging
| Autor: | Scott M. Bartram, Calum Williams, Matthew Julian, Hyunjung Kim, Stephen E. Borg |
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| Přispěvatelé: | Julian, Matthew N [0000-0003-3643-3484], Williams, Calum [0000-0002-6432-6515], Apollo - University of Cambridge Repository |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
nanotechnology business.industry Infrared Multispectral image photonics Hyperspectral imaging 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Optical switch Atomic and Molecular Physics and Optics Article Electronic Optical and Magnetic Materials 010309 optics Narrowband infrared 0103 physical sciences Transmittance Optoelectronics 0210 nano-technology business Optical filter Passband |
| Zdroj: | Optica |
| ISSN: | 2334-2536 |
| Popis: | Tunable narrowband spectral filtering across arbitrary optical wavebands is highly desirable in a plethora of applications, from chemical sensing and 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 device is ∼ 74 n m with ∼ 70 % transmittance and operates across the 3–5 µm 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. |
| Databáze: | OpenAIRE |
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