Ultrasmall all-optical plasmonic switch and its application to superresolution imaging

Because of their exceptional local-field enhancement and ultrasmall mode volume, plasmonic components can integrate photonics and electronics at nanoscale, and active control of plasmons is the key. However, all-optical modulation of plasmonic response with nanometer mode volume and unity modulation...

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Bibliographic Details
Published in:Scientific reports 2016-04, Vol.6 (1), p.24293-24293, Article 24293
Main Authors: Wu, Hsueh-Yu, Huang, Yen-Ta, Shen, Po-Ting, Lee, Hsuan, Oketani, Ryosuke, Yonemaru, Yasuo, Yamanaka, Masahito, Shoji, Satoru, Lin, Kung-Hsuan, Chang, Chih-Wei, Kawata, Satoshi, Fujita, Katsumasa, Chu, Shi-Wei
Format: Article
Language:English
Subjects:
Bleaching
Lasers
Nanoparticles
Nanowires
Nonlinear systems
Physics
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Summary:Because of their exceptional local-field enhancement and ultrasmall mode volume, plasmonic components can integrate photonics and electronics at nanoscale, and active control of plasmons is the key. However, all-optical modulation of plasmonic response with nanometer mode volume and unity modulation depth is still lacking. Here we show that scattering from a plasmonic nanoparticle, whose volume is smaller than 0.001 μm(3), can be optically switched off with less than 100 μW power. Over 80% modulation depth is observed, and shows no degradation after repetitive switching. The spectral bandwidth approaches 100 nm. The underlying mechanism is suggested to be photothermal effects, and the effective single-particle nonlinearity reaches nearly 10(-9) m(2)/W, which is to our knowledge the largest record of metallic materials to date. As a novel application, the non-bleaching and unlimitedly switchable scattering is used to enhance optical resolution to λ/5 (λ/9 after deconvolution), with 100-fold less intensity requirement compared to similar superresolution techniques. Our work not only opens up a new field of ultrasmall all-optical control based on scattering from a single nanoparticle, but also facilitates superresolution imaging for long-term observation.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep24293