Abstract：
: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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Wu HY,Huang YT,Shen PT,Lee H,Oketani R,Yonemaru Y,Yamanaka M,Shoji S,Lin KH,Chang CW,Kawata S,Fujita K,Chu SWdoi
10.1038/srep24293subject
Has Abstractpub_date
2016-04-11 00:00:00pages
24293issn
2045-2322pii
srep24293journal_volume
6pub_type
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