Flexible Nanoparticle-on-Mirror Strategy for Ultrasensitive Single-Molecule Detection by Directionally Coupling Surface Plasmon Polaritons

Social Science Research Network(2022)

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Abstract
Applying local surface plasmon resonance (LSPR) to a nanoparticle-on-mirror (NPOM) configuration for realizing highly sensitive molecule detection using surface-enhanced Raman scattering (SERS) typically enhances the Raman signal by 10 6 –10 10 under limiting conditions. We propose a special nanoparticle-fishbone structure (NPFS) system, which incorporates the surface plasmon polariton (SPP) coupler of the fishbone structure into the NPOM configuration, to achieve ultra-high local electric field enhancement by plasmon hybridizing the LSPR mode of metallic nanoparticles and the SPP mode of the fishbone array structure. During the numerical simulation, the NPFS system exhibited a SERS enhancement factor of 10 11 , which is two orders of magnitude higher than that of the NPOM system; the SERS experimental results further demonstrated its outstanding performance. These findings indicate that introducing a well-designed SPP coupler on the metallic film can further improve the advantages of various NPOM configurations. The proposed approach can open new horizons for designing nanoscale photonic devices for ultrasensitive single-molecule detection.
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