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A nano‐plasmonic chip for simultaneous sensing with dual‐resonance surface‐enhanced Raman scattering and localized surface plasmon resonance
Author(s) -
Lin Jiao,
Zhang Yuan,
Qian Jun,
He Sailing
Publication year - 2014
Publication title -
laser and photonics reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.778
H-Index - 116
eISSN - 1863-8899
pISSN - 1863-8880
DOI - 10.1002/lpor.201400029
Subject(s) - raman scattering , surface plasmon resonance , materials science , resonance (particle physics) , raman spectroscopy , plasmon , optoelectronics , refractive index , optics , figure of merit , nanotechnology , nanoparticle , physics , particle physics
A dual‐resonance surface‐enhanced Raman scattering (SERS) chip which also serves as a localized surface plasmon resonance (LSPR) refractive index sensor is proposed. The dual‐resonance SERS chip can simultaneously enhance excitation and Stokes lines for Raman signals detection in a broad wavelength region with virtually no limitation. Thus, it is especially useful for Raman detection at long wave numbers and hyper Raman. The great performance of this chip relies on the highly independent tunability of the two localized plasmonic resonances from the optical to the near‐infrared region and the strict “hot spot” match in space for both resonant wavelengths. Furthermore, Raman signals of poly‐methyl‐methacrylate (PMMA) from 500 cm −1 to 3300 cm −1 are measured in the experiments and an obvious superiority can be seen compared to a single‐resonance SERS chip. In an addition, by using the subradiant magnetic dipole resonance, the LSPR refractive sensor gives a high sensitivity of 577 nm/RIU and high figure of merit (FoM) of 14.2. The experimental results are consistent with the simulated results. This dual‐functional sensing chip opens a route for dual‐modality detection of the concentration of some specific molecules.