Mr. Vikas Kumar Profile

Vikas Kumar

Research Associate at University of Glasgow

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Proceedings Article | 1 August 2021 Poster + Paper

Role of domain size towards quantifying the optical properties of gold nanorods

Vikas ., Raj Kumar, Sanjeev Soni

Proceedings Volume 11797, 1179721 (2021) https://doi.org/10.1117/12.2594154

KEYWORDS: Absorption, Optical properties, Scattering, Nanoparticles, Gold, Plasmonics, Finite element methods, Refractive index, Nanorods

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The quantification of the spectral variation in optical properties, such as absorption and scattering cross-sections, of gold nanorods (GNRs) present within a medium is important for various applications such as spectroscopy, sensing and biomedical applications. The calculated absorption cross-section helps in the estimation of the plasmonic response of GNR, which is suitable for heat generation within a medium during the interaction of electromagnetic fields with nanoparticles. Here, the optical properties of GNR are simulated by using the finite element method and the role of domain size is evaluated. The domain is finer meshed by using tetrahedral elements of size range 0.48 – 60 nm, curvature factor of 0.7 and maximum element growth of 1.40. The electric field distribution is estimated by considering the propagation direction along the x-axis with incident field vectors along z-axis. The discussed results indicate that, on increasing the size of domain (medium) surrounding the GNR from 50 nm to 200 nm, the optical absorption cross-section increases by 450 nm², and scattering cross-section decreases by 190 nm². Also, the plasmonic wavelength of GNR gets blue-shifted, and the full-width half maxima (FWHM) gets decreased with an increase in the domain size. So, for the evaluation of the optical properties of GNR in a medium using the FEM model, the selection of domain diameter plays a significant role. Also, this quantitative knowledge of the role of a domain size will be useful for an estimation of the electric field distribution in a medium.

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