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Open AccessArticle

Numerical Investigation on Multiple Resonant Modes of Double-Layer Plasmonic Grooves for Sensing Application

1
School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian 116024, China
2
School of Physics, Dalian University of Technology, Dalian 116024, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(2), 308; https://doi.org/10.3390/nano10020308
Received: 17 December 2019 / Revised: 4 February 2020 / Accepted: 5 February 2020 / Published: 11 February 2020
(This article belongs to the Special Issue SERS/SERRS-Active Nanostructures and Nanocomposites)
A high-performance multi-resonance plasmonic sensor with double-layer metallic grooves is theoretically constructed by introducing a polymethyl methacrylate groove with a numerical simulation method. Multiple resonance wavelengths can be generated at the oblique incidence, and the number and feature of resonant mode for sensing detection is different for various incident angles. Specifically, at the incident angle of 30°, the reflection spectrum exhibits two resonant dips, in which the dip at the wavelength of 1066 nm has an extremely narrow line width of ~4.5 nm and high figure of merit of ~111.11. As the incident angle increases, the electric dipole mode gradually weakens, but the surface plasmon resonance and cavity resonance mode are enhanced. Therefore, for an incident angle of 65°, three resonance dips for sensing can be generated in the reflection spectrum to realize three-channel sensing measurement. These double-layer plasmonic grooves have potential in the development of advanced biochemical surface plasmon polariton measurements.
Keywords: double-layer plasmonic grooves; multi-resonance sensing; surface plasmon polaritons double-layer plasmonic grooves; multi-resonance sensing; surface plasmon polaritons
MDPI and ACS Style

Chu, S.; Wang, Q.; Yu, L.; Gao, H.; Liang, Y.; Peng, W. Numerical Investigation on Multiple Resonant Modes of Double-Layer Plasmonic Grooves for Sensing Application. Nanomaterials 2020, 10, 308.

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