Open AccessDispersion-based intertwined SEIRA and SPR effect detection of 2,4-dinitrotoluene using a plasmonic metasurface
Author(s) -
Alice Fabas,
Hasnaa El Ouazzani,
JeanPaul Hugonin,
Christophe Dupuis,
Riad Haïdar,
JeanJacques Greffet,
Patrick Bouchon
Publication year - 2020
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.413325
Subject(s) - materials science , spectroscopy , plasmon , infrared spectroscopy , refractive index , surface plasmon resonance , infrared , optics , dispersion (optics) , near infrared spectroscopy , surface plasmon , optoelectronics , nanotechnology , nanoparticle , chemistry , physics , organic chemistry , quantum mechanics
Surface enhanced infrared absorption (SEIRA) spectroscopy and surface plasmon resonance (SPR) make possible, thanks to plasmonics nanoantennas, the detection of low quantities of biological and chemical materials. Here, we investigate the infrared response of 2,4-dinitrotoluene deposited on various arrays of closely arranged metal-insulator-metal (MIM) resonators and experimentally show how the natural dispersion of the complex refractive index leads to an intertwined combination of SEIRA and SPR effect that can be leveraged to identify molecules. They are shown to be efficient for SEIRA spectroscopy and allows detecting of the dispersive explosive material, 2,4-dinitrotoluene. By changing the in-plane parameters, a whole spectral range of absorptions of 2,4-DNT is scanned. These results open the way to the design of sensors based on SEIRA and SPR combined effects, without including a spectrometer.