Abstract
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.
Highlights
Since the discovery of extraordinary optical transmission through subwavelength aperture arrays on opaque metal films [1], the design of metal nanostructures and analysis of involved physical mechanisms have attracted enormous attention, and these studies have tremendously contributed to the development of surface plasmonic nanophotonics [2,3,4,5,6]
Surface plasmon sensors have developed into an advanced detection method because of their high sensitivity, wide detection range and easy miniaturization
In order to overcome the shortcomings of a single-layer plasmonic groove structure in the sensing application, this paper proposes a novel structure in which multiple resonant modes of double-layer plasmonic grooves are induced by employing a prism
Summary
Since the discovery of extraordinary optical transmission through subwavelength aperture arrays on opaque metal films [1], the design of metal nanostructures and analysis of involved physical mechanisms have attracted enormous attention, and these studies have tremendously contributed to the development of surface plasmonic nanophotonics [2,3,4,5,6]. For the incident angle 30◦, the double-layer groove structure generates a sharp sub-radiant resonance with a narrow line width of 4.5 nm and a high FOM of up to 111.11.
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