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Numerical Simulation of Broadband Scattering by Coated and Noncoated Metal Nanostructures Using Discrete Dipole Approximation Method

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Abstract

We suggest numerical method to study the optical response of metal nanostructures. The analysis of optical properties such as scattering and absorption by coated and noncoated nanogeometry has been done using discrete dipole approximation (DDA) method. The core-shell nanogeometry supports surface plasmon resonances, which are highly tunable from 400 to 1100 nm. The tunability of surface plasmon resonance (SPR) highly depends on the structural anisotropy and chosen core-shell material. Further, we have observed that aspect ratio is one of the key parameter to decide the nature and position of the plasmonic peaks and magnitude of optical cross section. We have also shown that coated nanospheroid is a more appropriate geometry as compared to coated nanosphere and noncoated nanospheroid in terms of wide tunability of surface plasmon resonance. The wide tunability in SPR is observed for the effective radii 90 nm core-shell (Au@SiO2) nanospheroid with aspect ratio 0.1.

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Authors and Affiliations

  1. Center for Energy Studies, Indian Institute of Technology, Delhi, 110016, India

    Sangita Roopak, Nilesh Kumar Pathak, Alok Ji & R. P. Sharma

  2. Physics Department, Mahila Vidyalaya Degree College, Ganga Prasad Road, Aminabad, Lucknow, 226018, India

    Sangita Roopak

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  1. Sangita Roopak
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  2. Nilesh Kumar Pathak
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  3. Alok Ji
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  4. R. P. Sharma
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Correspondence to Sangita Roopak.

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Roopak, S., Pathak, N.K., Ji, A. et al. Numerical Simulation of Broadband Scattering by Coated and Noncoated Metal Nanostructures Using Discrete Dipole Approximation Method. Plasmonics 11, 425–432 (2016). https://doi.org/10.1007/s11468-015-0052-x

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