Tailoring cavity coupled plasmonic substrates for SERS applications

Dutta-Gupta, Shourya (2023) Tailoring cavity coupled plasmonic substrates for SERS applications. Nanotechnology, 34 (33). p. 335501. ISSN 0957-4484

Text
L_M_2023_Nanotechnology_34_335501.pdf - Published Version
Download (1MB)

Abstract

Surface-enhanced Raman spectroscopy (SERS) has been effectively used in biosensing applications due to its high sensitivity and specificity. Enhancing the coupling of light into plasmonic nanostructures can lead to engineered SERS substrates with improved sensitivity and performance. In the current study, we demonstrate a cavity-coupled structure that assists in enhancing the light-matter interaction leading to an improved SERS performance. Using numerical simulations, we demonstrate that the cavity-coupled structures can either enhance or suppress the SERS signal depending on the cavity length and the wavelength of interest. Furthermore, the proposed substrates are fabricated using low-cost large-area techniques. The cavity-coupled plasmonic substrate consists of a layer of gold nanospheres on an indium tin oxide (ITO)-Au-glass substrate. The fabricated substrates exhibit nearly a 9 times improvement in SERS enhancement as compared to the uncoupled substrate. The demonstrated cavity-coupling approach can also be used for enhancing other plasmonic phenomena like plasmonic trapping, plasmon-enhanced catalysis, and nonlinear signal generation.

[error in script]

IITH Creators:

IITH Creators	ORCiD
Dutta-Gupta, Shourya	https://orcid.org/0000-0001-5680-3847

Item Type:

Article

Uncontrolled Keywords:

cavity-coupling; gold nanoparticles; plasmonics; sensing; SERS; Gold nanoparticles; Glass substrates; ITO glass; Nanospheres; Plasmonics; Raman spectroscopy; Tin oxides; Biosensing applications; Cavity-coupling; Coupled structures; Gold nanoparticle; Gold Nanoparticles; Performance; Plasmonics; Sensing; Spectroscopy applications; Surface enhanced Raman spectroscopy

Subjects:

Materials Engineering > Testing and measurement
Materials Engineering > Materials engineering
Materials Engineering > Nanostructured materials, porous materials

Divisions:

Department of Material Science Engineering

Depositing User:

Mr Nigam Prasad Bisoyi

Date Deposited:

05 Jan 2024 14:46

Last Modified:

05 Jan 2024 14:46

URI:

http://raiithold.iith.ac.in/id/eprint/11773