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Updated: Jul 30, 2025

Author Spotlight: Development and Application of SERS Flexible Substrates Using Synthesized AgNPs

Author Spotlight: Development and Application of SERS Flexible Substrates Using Synthesized AgNPs

Published on: November 17, 2023

Tailoring cavity coupled plasmonic substrates for SERS applications.

Jagathpriya L M¹, Jayakumar Pillanagrovi¹, Shourya Dutta-Gupta¹

¹Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Hyderabad, India.

|May 12, 2023

Summary

We developed a novel cavity-coupled plasmonic substrate that significantly enhances light-matter interactions for improved Surface-Enhanced Raman Spectroscopy (SERS) performance. This low-cost, large-area technique offers a nearly 9x enhancement in SERS signals.

Keywords:

SERS cavity-coupling gold nanoparticles plasmonics sensing

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Area of Science:

Plasmonics
Nanotechnology
Spectroscopy

Background:

Surface-enhanced Raman spectroscopy (SERS) offers high sensitivity and specificity for biosensing.
Optimizing light coupling into plasmonic nanostructures is key to enhancing SERS substrate performance.
Engineered substrates are needed to improve light-matter interactions for advanced SERS applications.

Purpose of the Study:

To demonstrate a cavity-coupled structure for enhanced light-matter interaction and improved SERS performance.
To investigate the influence of cavity length and wavelength on SERS signal modulation.
To fabricate and characterize cost-effective, large-area cavity-coupled plasmonic substrates.

Main Methods:

Numerical simulations were employed to model the optical properties of cavity-coupled structures.
Fabrication of substrates involved depositing gold nanospheres onto indium tin oxide (ITO)-Au-glass layers.
Experimental characterization of SERS enhancement was performed using the fabricated substrates.

Main Results:

Cavity-coupled structures demonstrated the ability to enhance or suppress SERS signals based on design parameters.
Simulations predicted tunable SERS signal modulation with cavity length and wavelength.
Fabricated substrates showed a nearly 9-fold improvement in SERS enhancement compared to uncoupled designs.

Conclusions:

The cavity-coupling approach effectively enhances light-matter interactions for superior SERS performance.
Low-cost, large-area fabrication methods are viable for producing these advanced plasmonic substrates.
This technique holds potential for improving other plasmonic phenomena, including trapping, catalysis, and nonlinear signal generation.