Open AccessLight localization and SERS in tip-shaped silicon metasurface
Author(s) -
A. N. Lagarkov,
I. A. Boginskaya,
I. V. Bykov,
Igor A. Budashov,
А. В. Иванов,
Ilya N. Kurochkin,
Ilya A. Ryzhikov,
Ilya A. Rodionov,
Marina Sedova,
A. V. Zverev,
Andrey K. Sarychev
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.017021
Subject(s) - dielectric , materials science , electric field , plasmon , optics , nanophotonics , optoelectronics , surface plasmon resonance , silicon , electromagnetic field , surface plasmon , raman spectroscopy , surface plasmon polariton , resonance (particle physics) , resonator , nanoparticle , nanotechnology , physics , atomic physics , quantum mechanics
Optical properties of two dimensional periodic system of the silicon micro-cones are investigated. The metasurface, composed of the silicon tips, shows enhancement of the local optical field. Finite element computer simulations as well as real experiment reveal anomalous optical response of the dielectric metasurface due to excitation of the dielectric resonances. Various electromagnetic resonances are considered in the dielectric cone. The metal-dielectric resonances, which are excited between metal nanoparticles and dielectric cones, are also considered. The resonance local electric field can be much larger than the field in the usual surface plasmon resonances. To investigate local electric field the signal molecules are deposited on the metal nanoparticles. We demonstrate enhancement of the electromagnetic field and Raman signal from the complex of DTNB acid molecules and gold nanoparticles, which are distributed over the metasurface. The metasurfaces composed from the dielectric resonators can have quasi-continuous spectrum and serve as an efficient SERS substrates.