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Tuning of the Plasmonic Response Gold and Aluminum Nanoarrays for Sensing Applications

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Title Tuning of the Plasmonic Response Gold and Aluminum Nanoarrays for Sensing Applications
 
Creator Singh, Gaurav Pal
Harsh, Raj
Sardana, Neha
 
Subject Plasmons
Localized surface plasmon resonance (LSPR)
Sensing
Gold nanoparticles
 
Description 77-86
Nanoarrays are at the forefront of research and commercial plasmonic devices. The shape, size, periodicity and material of
the structures in nanoarrays determine their optical response. Therefore, the performance and operating wavelength range of the
nanoarrays can be tuned by the aforementioned parameters. Disc, square and triangular nanoarrays of gold and aluminum were
compared using finite element method (FEM) simulations. The effect of size, thickness and periodicity was studied in detail.
The coupling effect of the resonant modes observed in the nanoarrays resulted in a sharp resonance in the transmission spectra,
which could be used for next generation chemical and biosensors. Gold nanoarrays had stronger resonance in the visible
spectrum. Aluminum nanoarrays displayed resonant modes in the UV region, which were absent for gold. However, weak
resonances for aluminum were seen in the visible region due to the increased losses. Sensitivity of nanoarrays was compared to
quantify their performance. The coupling of the lattice resonance with the single structure resonance had a major impact on the
sensing performance. Nanoarray with gold triangles at the optimal coupling condition (wavelength of lattice resonance equal to
the single triangle) showed the highest sensitivity, 541 nm/RIU, which was also compared to the sensing substrates in literature.
Shapes with more potential for hotspots were considered highly suitable for sensing applications.
 
Date 2024-02-26T09:30:16Z
2024-02-26T09:30:16Z
2024-02
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://nopr.niscpr.res.in/handle/123456789/63417
https://doi.org/10.56042/ijpap.v62i2.7709
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source IJPAP Vol.62(02) [February 2024]