Plasmon nanofocusing enables to create an intense nanoscale light source through super-focusing of plasmons propagating on a metallic tapered structure toward its apex. Among various unique characteristics of plasmon nanofocusing, the broadband property has recently been gaining attention in the nanophotonics field, owing to several successful applications such as broadband super-resolution spectral imaging. Here, we introduce a more active way to apply broadband plasmon nanofocusing, which is nanoscale optical switching of electronic states of photochromic materials by ultraviolet and visible plasmon nanofocusing. We will also introduce a few more new applications of broadband plasmon nanofocusing such as absorption sensing.
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