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Electrotunable Nanoplasmonics for Amplified Surface Enhanced Raman Spectroscopy
Ye Ma1,2, Debabrata Sikdar1,3, Aleksandra Fedosyuk1
1Department of Chemistry , Imperial College London , Molecular Sciences Research Hub, White City Campus , London W12 0BZ , U.K.
ACS Nano
|December 7, 2019
Summary
Real-time tuning of optical metamaterials is achieved by electrovariable nanoparticle assembly. This enables adaptive photonic materials with tunable optical reflectivity and amplified SERS signals through electrochemical nanoplasmonics.
Area of Science:
- Photonics
- Materials Science
- Nanotechnology
Background:
- Tuning optical metamaterial properties in real-time is a significant challenge.
- Adaptive photonic materials are crucial for applications like SERS and tunable reflectors/absorbers.
Purpose of the Study:
- To demonstrate real-time tuning of optical metamaterials.
- To explore electrovariable self-assembly of nanoparticle arrays for adaptive photonics.
Main Methods:
- Utilized voltage-controlled assembly of gold nanoparticle arrays at a TiN/Ag electrode interface.
- Investigated plasmonic coupling between nanoparticles and the metal surface.
Main Results:
- Achieved reversible control over nanoparticle array density via electrode potential variation.
- Demonstrated a dramatic optical reflectivity change (93% to 1%) with <1 V potential change.
- Showcased SERS signal amplification by up to 5 orders of magnitude.
Conclusions:
- Electrochemical nanoplasmonics offers a promising route for adaptive photonic materials.
- Experimental results align with theoretical predictions for collective plasmon-coupling effects.
Keywords:
electrotunablemetasurfacenanoparticlesplasmonicsself-assemblysurface enhanced Raman spectroscopy
