Núñez Leyva, Juan ManuelKolosovas Machuca, Eleazar SamuelSánchez, John EderGuevara, EdgarCuadrado Conde, AlexanderAlda, JavierGonzález, Francisco Javier2023-06-172023-06-172021-06-282079-499110.3390/nano11071696https://hdl.handle.net/20.500.14352/8361Received: 12 May 2021 / Accepted: 22 June 2021 / Published: 28 June 2021.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.engAtribución 3.0 Españahttps://creativecommons.org/licenses/by/3.0/es/journal articlehttps://doi.org/10.3390/nano11071696https://www.mdpi.com/2079-4991/11/7/1696open access620.3537.8543.424.2Computational electromagnetismGold nanorodsRaman spectroscopyElectromagnetismoÓptica (Física)Partículas2202 Electromagnetismo2209.19 Óptica Física2208 Nucleónica