Exploring optimized configurations of plasmonic nanoparticles

Prathamesh Pavaskar; Jesse Theiss; Stephen B. Cronin

doi:10.1117/12.871876

22 September 2010 Exploring optimized configurations of plasmonic nanoparticles

Prathamesh Pavaskar, Jesse Theiss, Stephen B. Cronin

Author Affiliations +

Proceedings Volume 7757, Plasmonics: Metallic Nanostructures and Their Optical Properties VIII; 77573P (2010) https://doi.org/10.1117/12.871876
Event: SPIE NanoScience + Engineering, 2010, San Diego, California, United States

Abstract

Finite difference time domain (FDTD) simulations are used to find the electric field intensity at the center of a cluster of plasmonic nanoparticles irradiated by a planewave source. We use an iterative optimization algorithm to maximize the electric field intensity. The resulting optimized configurations are found to be non-symmetric and non-intuitive, and cannot be obtained by analytical calculation methods. Experimentally, we investigate a novel technique using angle evaporation to produce plasmonic nanostructures with gap sizes of 1-2 nm. We evaluate the plasmonic activity of these nanoparticles both experimentally using surface enhanced Raman spectroscopy (SERS) measurements and theoretically using FDTD simulations. These simulations predict an electric field intensity enhancement of 82,400 at the center of the nanoparticle dimer, and an electromagnetic SERS enhancement factor of 10⁹-10¹⁰.

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Prathamesh Pavaskar, Jesse Theiss, and Stephen B. Cronin "Exploring optimized configurations of plasmonic nanoparticles", Proc. SPIE 7757, Plasmonics: Metallic Nanostructures and Their Optical Properties VIII, 77573P (22 September 2010); https://doi.org/10.1117/12.871876

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KEYWORDS

Nanoparticles

Plasmonics

Surface enhanced Raman spectroscopy

Electromagnetism

Finite-difference time-domain method

Metals

Raman spectroscopy

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