Computational and Experimental Analysis of Gold Nanorods in Terms of Their Morphology: Spectral Absorption and Local Field Enhancement
- Resource Type
- Authors
- Eleazar Samuel Kolosovas-Machuca; John E. Sanchez; Francisco Javier González; Alexander Cuadrado; Juan Manuel Núñez-Leyva; Javier Alda; Edgar Guevara
- Source
- Nanomaterials
Volume 11
Issue 7
E-Prints Complutense. Archivo Institucional de la UCM
instname
Nanomaterials, Vol 11, Iss 1696, p 1696 (2021)
- Subject
- Materials science
General Chemical Engineering
Physics::Medical Physics
Physics::Optics
Nanoparticle
Molecular physics
Article
symbols.namesake
General Materials Science
Electromagnetismo
Optica
Absorption (electromagnetic radiation)
QD1-999
Local field
Óptica
computational electromagnetism
Surface plasmon
Amplification factor
gold nanorods
Finite element method
Chemistry
Raman spectroscopy
Partículas
symbols
Nanorod
- Language
- ISSN
- 2079-4991
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.