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
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Creator |
Singh, Gaurav Pal
Harsh, Raj Sardana, Neha |
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Subject |
Plasmons
Localized surface plasmon resonance (LSPR) Sensing Gold nanoparticles |
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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. |
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Date |
2024-02-26T09:30:16Z
2024-02-26T09:30:16Z 2024-02 |
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Type |
Article
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Identifier |
0975-0959 (Online); 0301-1208 (Print)
http://nopr.niscpr.res.in/handle/123456789/63417 https://doi.org/10.56042/ijpap.v62i2.7709 |
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Language |
en
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Publisher |
NIScPR-CSIR, India
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Source |
IJPAP Vol.62(02) [February 2024]
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