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19 September 2018 Plasmonic vanadium dioxide microbolometers with wavelength and polarisation sensitivity
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Uncooled microbolometric photodetection is a key technology for low cost, reliable and lightweight infrared sensing but suffers in performance compared to cooled photodetectors. Introducing new microbolometer functionality such as wavelength and polarisation sensitivity will improve current device performance and encourage new market opportunities. One method is to introduce metallic nanostructures, which are widely known to exhibit strong localised surface plasmon resonances (LSPR) that are sensitive to incident wavelength and polarisation. This work presents the integration of plasmonic silver nanorods into the material vanadium dioxide VO2. An experimental correlation between suppression of VO2 resistivity and dips in transmission spectra was observed. Subsequent optical and thermal simulations of VO2 films, both on sapphire Al2O3 and suspended in air, demonstrate how LSPR-driven electric field enhancement leads to localised heating around the nanorods and subsequent temperature distribution on the nanoscale. This work opens the path to a broad family of photodetection functionalities for vanadium dioxide-based microbolometers.
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James D. Frame, Nicolas G. Green, Wakana Kubo, and Xu Fang "Plasmonic vanadium dioxide microbolometers with wavelength and polarisation sensitivity", Proc. SPIE 10722, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVI, 1072216 (19 September 2018);

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