SERS and plasmon resonance of engineered nanoparticle arrays

D. R. Chamberlin; Z. Wang; K. A. Sultana; E. K. C. Chow; M. M. Sigalas; M. Liu; A. C. Grot; S. Fan

doi:10.1117/12.617992

26 August 2005 SERS and plasmon resonance of engineered nanoparticle arrays

D. R. Chamberlin, Z. Wang, K. A. Sultana, E. K. C. Chow, M. M. Sigalas, M. Liu, A. C. Grot, S. Fan

Proceedings Volume 5927, Plasmonics: Metallic Nanostructures and Their Optical Properties III; 592708 (2005) https://doi.org/10.1117/12.617992
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

While much work has focused on simulation and measurement of plasmon resonances in noble metal nanostructures, usually the simulation tool is used as a confirmation of experimental results. In this work we use a finite difference time domain (FDTD) technique to calculate the plasmon resonance and electric field enhancement of Ag nanoparticles in regular arrays on quartz substrates. Such structures have also been prepared by e-beam lithography, and the plasmon resonance and surface-enhanced Raman scattering strength of arrays with different nanoparticle size and spacing have been investigated. Arrays of cylindrical nanoparticles were fabricated with varying particle size and interparticle spacing. The observed extinction peaks agree very well with the extinction peaks as calculated by FDTD; typically within a few percent. Experimental plasmon peak widths are considerably larger than their ideal values due to inhomogeneous broadening. As expected, the particle array with highest SERS enhancement has its plasmon resonance nearest the laser and Stokes-shifted wavelengths. We believe the FDTD modeling tool is accurate enough to use as a predictive tool for engineering plasmonic nanostructures.

Citation Download Citation

D. R. Chamberlin, Z. Wang, K. A. Sultana, E. K. C. Chow, M. M. Sigalas, M. Liu, A. C. Grot, and S. Fan "SERS and plasmon resonance of engineered nanoparticle arrays", Proc. SPIE 5927, Plasmonics: Metallic Nanostructures and Their Optical Properties III, 592708 (26 August 2005); https://doi.org/10.1117/12.617992

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