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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 6, Iss. 1 — Jan. 3, 2011

Plasmon field enhancement in silver core-protruded silicon shell nanocylinder illuminated with light at 633 nm

Ming-Je Sung, Yao-Feng Ma, Yuan-Fong Chau, and Ding-Wei Huang  »View Author Affiliations

Applied Optics, Vol. 49, Issue 32, pp. 6295-6301 (2010)

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We show, to the best of our knowledge, the first simulation result of the strong plasmonic field coupling and enhancement at the Ag/Si interface of a silver core/protruded silicon shell nanocylinder by using the finite-element method. The strong plasmon field, with a slow effective phase velocity accumulated at the Ag/Si interface, which results from the large effective index of the surface plasmon due to the nearly identical real parts with opposite signs of the permittivities of silver and silicon at 633 nm , is analyzed. When the silicon shell has shallow protrusions of proper periodicity to meet the phase matching condition between the incident light and the surface plasmon wave at the Ag/Si interface, a higher scattered electric field and a higher sensitivity to the refractive index change of the surrounding medium can be achieved. Furthermore, a feasible implementation of the core–shell nanocylinder design concept is studied and discussed.

© 2010 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Optics at Surfaces

Original Manuscript: June 7, 2010
Revised Manuscript: October 11, 2010
Manuscript Accepted: October 11, 2010
Published: November 5, 2010

Virtual Issues
Vol. 6, Iss. 1 Virtual Journal for Biomedical Optics

Ming-Je Sung, Yao-Feng Ma, Yuan-Fong Chau, and Ding-Wei Huang, "Plasmon field enhancement in silver core-protruded silicon shell nanocylinder illuminated with light at 633nm," Appl. Opt. 49, 6295-6301 (2010)

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