21 February 2018 Phase-change band-pass filters for multispectral imaging
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Phase-change materials (PCMs) provide a route to adding dynamic tunability and reconfigurability to many types of photonic devices by changing the phase-state of the PCM itself. In this work we discuss the use of the phase-change alloy GeSbTe (GST) in the design of dynamically tunable filters operating in the infrared. GST is used to manipulate the extraordinary optical transmission of a periodic hole-array in a metallic layer, so creating ultra-thin, tunable band-pass filters. We discuss the use of such filters for multispectral imaging, suggest some approaches to overcome various practical challenges, and, finally, show that through the use of appropriate post processing algorithms this tunable filter could provide a cheap, ultra-thin, real-time, and relatively high performance multispectral imaging device.
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Liam Trimby, Liam Trimby, Anna Baldycheva, Anna Baldycheva, C. David Wright, C. David Wright, } "Phase-change band-pass filters for multispectral imaging", Proc. SPIE 10541, Photonic and Phononic Properties of Engineered Nanostructures VIII, 105412B (21 February 2018); doi: 10.1117/12.2290405; https://doi.org/10.1117/12.2290405

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