Few Percent Efficient Polarization-Sensitive Conversion in Nonlinear Plasmonic Interactions Inside Oligomeric Gold Structuresстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 1 февраля 2021 г.
Аннотация:The backscattering spectra of a 500 nm thick gold film, which was excited near the525 nm transverse localized plasmon resonance of its constituent, self-organized, vertically-alignednanorods by normally incident 515 nm, 300 fs laser pulses with linear, radial, azimuthal and circularpolarizations, revealed a few-percent conversion into Stokes and anti-Stokes side-band peaks.The investigation of these spectral features based on the nanoscale characterization of the oligomericstructure and numerical simulations of its backscattering response indicated nonlinear Fano-likeplasmonic interactions, particularly the partially degenerate four-wave mixing comprised by thevisible-range transverse plasmon resonance of the individual nanorods and an IR-range collectivemode of the oligomeric structure. Such oligomeric structures in plasmonic films may greatly enhanceinner nonlinear electromagnetic interactions and inner near-IR hotspots, paving the way for theirengineered IR tunability for broad applications in chemosensing and biosensing.