Open AccessSpoof plasmons enable giant Raman scattering enhancement in Near-Infrared region
Author(s) -
Yana V. Fedotova,
В. И. Кукушкин,
V. V. Solovyev,
И. В. Кукушкин
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.032578
Subject(s) - materials science , plasmon , raman scattering , optics , surface plasmon polariton , surface plasmon , optoelectronics , infrared , scattering , dielectric , photolithography , metamaterial , localized surface plasmon , raman spectroscopy , physics
Exceptionally strong enhancement of the Raman signal exceeding eight orders of magnitude for near-infrared (1064 nm) excitation is demonstrated for an array of dielectric submicron pillars covered by a relatively thick metal layer. The microstructure is designed to support 'spoof' plasmon-polariton excitations with resonant frequencies significantly below the fundamental surface plasmon resonance. Experiments reveal a relatively narrow range of spatial parameters for the optimal resonant scattering enhancement. They include a period close to the excitation wavelength, a specific ratio of the pillar planar size to the period, and optimal heights of both the pillars and the covering silver metal layer. The realized microstructures can be produced by fab-compatible photolithography techniques, and their outstanding sensing possibilities open the venue for the biomedical applications.