Propagating gap-plasmons of a closely coupled dimeric silver nanowire directly visualized by wide-field SERS

Zee Hwan Kim; Sang-Min Park

doi:10.1117/12.2567614

20 August 2020 Propagating gap-plasmons of a closely coupled dimeric silver nanowire directly visualized by wide-field SERS

Zee Hwan Kim, Sang-Min Park

Author Affiliations +

Proceedings Volume 11468, Enhanced Spectroscopies and Nanoimaging 2020; 1146808 (2020) https://doi.org/10.1117/12.2567614
Event: SPIE Nanoscience + Engineering, 2020, Online Only

Abstract

We report the first direct visualization of gap-SPPs propagating on a AgNW dimer. A self-assembled AgNW dimer loaded with a monolayer of molecules is locally excited to launch the SPPs, and the wide-field microscopy maps of surface-enhanced Raman scattering (SERS) of the molecules are acquired. The SERS images, representing the gap-field intensity distributions, reveal that the gap-plasmons of AgNW dimers with a few nm of gap can propagate up to ~8 um. The images also show oscillating components with periods of 400 ~ 800 nm, arising from the mode-beating of the two gap-SPP modes. Through a close comparison with electrodynamics simulations of NWs, we identify that the two modes are the monopole-monopole gap-modes with a propagation length of 0.5 ~ 2 um), and the dipole-dipole gap-modes with a propagation length of 5 ~ 8 um.

Conference Presentation

Citation Download Citation

Zee Hwan Kim and Sang-Min Park "Propagating gap-plasmons of a closely coupled dimeric silver nanowire directly visualized by wide-field SERS", Proc. SPIE 11468, Enhanced Spectroscopies and Nanoimaging 2020, 1146808 (20 August 2020); https://doi.org/10.1117/12.2567614

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