Plasmonic vanadium dioxide microbolometers with wavelength and polarisation sensitivity

James D. Frame; Nicolas G. Green; Wakana Kubo; Xu Fang

doi:10.1117/12.2320554

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19 September 2018 Plasmonic vanadium dioxide microbolometers with wavelength and polarisation sensitivity

James D. Frame, Nicolas G. Green, Wakana Kubo, Xu Fang

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Proceedings Volume 10722, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVI; 1072216 (2018) https://doi.org/10.1117/12.2320554
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

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.

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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); https://doi.org/10.1117/12.2320554

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