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Optimal Dimensions of Gold Nanorod for Plasmonic Nanosensors

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Abstract

Localized surface plasmon resonance (LSPR) for longitudinal mode of gold nanorod is simulated by using Gans theory. The parameters like surface scattering, radiation damping, and dynamic depolarization of radiation across the surface of nanorod affecting response of free electrons towards optical excitation are considered. Simulation results show that refractive index sensitivity linearly rises with size and aspect ratio, whereas this leads to the broadening of resonant line width also. Therefore, to optimize the size of nanorod, figure of merit (FOM) is calculated and observed that optimized width is 15 nm for an aspect ratio of 2, whereas it is 12 nm for aspect ratios 3 and 4. Further, optimization by using newly modified figure of merit (MFOM) shows that optimized width is 39 nm for aspect ratio of 2 and 24 nm for 3 and 4 aspect ratios. It is also found that at aspect ratio 2, both FOM and MFOM are higher than the aspect ratios 3 and 4. The quality factor calculation for LSPR response of nanorod explains its dependence with aspect ratio and optimized dimensions.

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Acknowledgment

Author Jagmeet Singh Sekhon would like to thank SLIET authorities for the financial support in the form of institute fellowship towards his Ph.D.

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Authors and Affiliations

  1. Department of Physics, Sant Longowal Institute of Engineering and Technology Longowal, District Sangrur, Punjab, 148-106, India

    Jagmeet Singh Sekhon & S. S. Verma

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  1. Jagmeet Singh Sekhon
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  2. S. S. Verma
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Correspondence to Jagmeet Singh Sekhon.

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Sekhon, J.S., Verma, S.S. Optimal Dimensions of Gold Nanorod for Plasmonic Nanosensors. Plasmonics 6, 163–169 (2011). https://doi.org/10.1007/s11468-010-9182-3

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  • DOI: https://doi.org/10.1007/s11468-010-9182-3

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