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Coupled plasmonic systems: controlling the plasmon dynamics and spectral modulations for molecular detection
Yuto Kitajima1, Hiyori Sakamoto1, Kosei Ueno1
1Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan. ueno@sci.hokudai.ac.jp.
Nanoscale
|March 9, 2021
Summary
Recent studies explore coupled plasmonic systems for enhanced molecular detection. Controlling plasmon dynamics via spectral modulations and coupling regimes improves sensitivity, enabling single-molecule detection.
Area of Science:
- Plasmonics and Nanophotonics
- Molecular Spectroscopy
- Sensing Technologies
Background:
- Coupled plasmonic systems offer tunable optical properties.
- Localized surface plasmon resonances (LSPRs) are sensitive to their environment.
- Controlling plasmon dynamics is key for advanced applications.
Purpose of the Study:
- To review recent advancements in coupled plasmonic systems for molecular detection.
- To elucidate the role of plasmon dynamics and spectral modulations in sensing.
- To highlight methods for achieving high-sensitivity molecular detection.
Main Methods:
- Investigating weak and strong coupling regimes between plasmonic nanostructures and optical modes (e.g., microcavities).
- Analyzing spectral modulations induced by plasmon-molecule interactions (electronic and vibrational states).
- Examining near-field enhancement through extended plasmon dephasing times.
Main Results:
- Coupling regimes effectively control plasmon dephasing time and near-field enhancement.
- Modal coupling enhances signal detection at specific wavelengths.
- Plasmon-molecule interactions induce subtle spectral shifts, enabling sensitive detection.
- Methods demonstrate sensitivity down to single-molecule detection.
Conclusions:
- Coupled plasmonic systems provide a powerful platform for ultrasensitive molecular detection.
- Spectral modulation is a viable strategy for label-free sensing.
- Further research in plasmon dynamics control can unlock new sensing capabilities.
