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Coupling localized plasmonic and photonic modes tailors and boosts ultrafast light modulation by gold nanoparticles

AuthorsWang, X.; Morea, Roberta ; Gonzalo, J. ; Palpant, B.
KeywordsPhotonic cavity
Gold nanoparticles
Nonlinear optical response
Transient optical response
Ultrafast modulation
Issue Date23-Mar-2015
PublisherAmerican Chemical Society
CitationNano Letters 15: 2633- 2639 (2015)
Abstract© 2015 American Chemical Society. (Figure Presented) Plasmonic nanoparticles offer a broad range of functionalities, owing to their ability to amplify light in the near-field or convert it into heat. However, their ultrafast nonlinear optical response remains too low to envisage all-optical high-rate photonic processing applications. Here, we tackle this challenge by coupling the localized plasmon mode in gold nanoparticles with a localized photonic mode in a 1D resonant cavity. Despite the nonradiative losses, we demonstrate that a strong, reversible, and ultrafast optical modulation can be achieved. By using a light pumping fluence of less than 1 mJ cm-2, a change of signal transmittance of more than 100% is generated within a few picosecond time scale. The nanoparticle transient optical response is enhanced by a factor of 30 to 40 while its spectral profile is strongly sharpened. The large nonlinear response of such plasmonic cavities could open new opportunities for ultrafast light processing at the nanoscale.
Description7 págs.; 3 figs.
Publisher version (URL)http://dx.doi.org/10.1021/acs.nanolett.5b00226
Identifiersdoi: 10.1021/acs.nanolett.5b00226
issn: 1530-6992
Appears in Collections:(CFMAC-IO) Artículos
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