A pancake-shaped nano-aggregate for focusing surface plasmons

Shao Ying Huang, Weng Cho Chew, Yang G. Liu, Bae Ian Wu, H. W. Choi

Research output: Contribution to journalArticlepeer-review

Abstract

We proposed a pancake-shaped nano-aggregate that highly focuses surface plasmons. The structure is a superposition of bowtie-shaped dimers, where surface plasmons are excited, resonated with the structure, and coupled. Surface integral equation method (Poggio-Miller-Chang-Harrington-Wu-Tsai method) is used to predict the performance of the proposed structure. It is a method which can accurately calculate the near-fields of nanoparticles. Based on the numerical prediction, the proposed structure shows an electric field (E-field) enhancement of more than 400 times, which is equivalent to a Raman enhancement factor of more than 2.5 e 10 times. It is promising for single molecule detections using surface-enhanced Raman scattering. The physics of the proposed structure are revealed. It is useful to design nanostructures for high E-field enhancement.

Original languageEnglish (US)
Article number034308
JournalJournal of Applied Physics
Volume111
Issue number3
DOIs
StatePublished - Feb 1 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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