Issue 10, 2021

Coupled plasmonic systems: controlling the plasmon dynamics and spectral modulations for molecular detection

Abstract

This review describes recent studies on coupled plasmonic systems for controlling plasmon dynamics and molecular detection using spectral modulations. The plasmon dephasing time can be controlled by weak and strong coupling regimes between the plasmonic nanostructures or localized surface plasmon resonances (LSPRs) and the other optical modes such as microcavities. The modal coupling induces near-field enhancement by extending the plasmon dephasing time to increase the near-field enhancement at certain wavelengths resulting in the enhancement of molecular detection. On the other hand, the interaction between LSPR and molecular excited or vibrational states also modulates the resonance spectrum, which can also be used for detecting a small number of molecules with a subtle change in the spectrum. The spectral modulation is induced by weak and strong couplings between LSPRs and the electronic or vibrational states of molecules, and this method is sensitive enough to measure a single molecule.

Graphical abstract: Coupled plasmonic systems: controlling the plasmon dynamics and spectral modulations for molecular detection

Article information

Article type
Review Article
Submitted
16 sep 2020
Accepted
14 feb 2021
First published
09 mrt 2021

Nanoscale, 2021,13, 5187-5201

Coupled plasmonic systems: controlling the plasmon dynamics and spectral modulations for molecular detection

Y. Kitajima, H. Sakamoto and K. Ueno, Nanoscale, 2021, 13, 5187 DOI: 10.1039/D0NR06681H

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