Few percent efficient polarization-sensitive conversion in nonlinear plasmonic interactions inside oligomeric gold structures

Nikolay Busleev, Sergey Kudryashov, Irina Saraeva, Pavel Danilov, Andrey Rudenko, Dmitry Zayarny, Stefan A. Maier, Pham Hong Minh, Andrey Ionin

Research output: Contribution to journalArticleResearchpeer-review

1 Citation (Scopus)

Abstract

The backscattering spectra of a 500 nm thick gold film, which was excited near the 525 nm transverse localized plasmon resonance of its constituent, self-organized, vertically-aligned nanorods by normally incident 515 nm, 300 fs laser pulses with linear, radial, azimuthal and circular polarizations, 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 oligomeric structure and numerical simulations of its backscattering response indicated nonlinear Fano-like plasmonic interactions, particularly the partially degenerate four-wave mixing comprised by the visible-range transverse plasmon resonance of the individual nanorods and an IR-range collective mode of the oligomeric structure. Such oligomeric structures in plasmonic films may greatly enhance inner nonlinear electromagnetic interactions and inner near-IR hotspots, paving the way for their engineered IR tunability for broad applications in chemosensing and biosensing.

Original languageEnglish
Article number59
Number of pages9
JournalSensors
Volume21
Issue number1
DOIs
Publication statusPublished - 1 Jan 2021
Externally publishedYes

Keywords

  • Four-wave mixing
  • Gold nanorods
  • Laguerre–Gaussian beams
  • Plasmonic sensors
  • Resonance structures

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