期刊
NANO LETTERS
卷 15, 期 4, 页码 2633-2639出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b00226
关键词
plasmonics; photonic cavity; ultrafast modulation; transient optical response; nonlinear optical response; gold nanoparticles
类别
资金
- Spanish Ministry of Economy Competitivity [MAT2009-14282-C02-01, TEC2012-38901-C02-01]
- Spanish Government through a FPI grant
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.
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