Computational and Experimental Analysis of Gold Nanorods in Terms of Their Morphology: Spectral Absorption and Local Field Enhancement

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Núñez Leyva, Juan Manuel and Kolosovas Machuca, Eleazar Samuel and Sánchez, John Eder and Guevara, Edgar and Cuadrado Conde, Alexander and Alda, Javier and González, Francisco Javier (2021) Computational and Experimental Analysis of Gold Nanorods in Terms of Their Morphology: Spectral Absorption and Local Field Enhancement. Nanomaterials, 11 (1696). 12 p.. ISSN 2079-4991

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Official URL: https://doi.org/10.3390/nano11071696




Abstract

A nanoparticle’s shape and size determine its optical properties. Nanorods are nanoparticles that have double absorption bands associated to surface plasmon oscillations along their two main axes. In this work, we analize the optical response of gold nanorods with numerical simulations and spectral absorption measurements to evaluate their local field enhancement—which is key for surface-enhanced Raman spectroscopic (SERS) applications. Our experimental results are in good agreement with finite element method (FEM) simulations for the spectral optical absorption of the nanoparticles. We also observed a strong dependence of the optical properties of gold nanorods on their geometrical dimension and shape. Our numerical simulations helped us reveal the importance of the nanorods’ morphology generated during the synthesis stage in the evaluation of absorption and local field enhancement. The application of these gold nanorods in surface-enhancement Raman spectroscopy is analyzed numerically, and results in a 5.8×104 amplification factor when comparing the values obtained for the nanorod deposited on a dielectric substrate compared to the nanorod immersed in water.


Item Type:Article
Additional Information:

Received: 12 May 2021 / Accepted: 22 June 2021 / Published: 28 June 2021.

Uncontrolled Keywords:Computational electromagnetism; Gold nanorods; Raman spectroscopy
Subjects:Sciences > Physics > Electromagnetism
Sciences > Physics > Optics
Sciences > Physics > Particles
ID Code:67518
Deposited On:01 Dec 2021 12:31
Last Modified:01 Dec 2021 15:37

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