Numerically study the method to tune the intensity of the surface plasmon

Sheng Chung Chen, Tieh Ming Chang, Din Ping Tsai

Research output: Journal article publicationConference articleAcademic researchpeer-review


There are two modes of surface plasmon, radiative and nonradiative. Theoretically, the evanescent surface electric fileds (nonradiative surface plasmon) have their maximum on the surface and exponentially decaying field perpendicular to it. Though the evanescent surface wave can not radiate, the enhancement of the surface electric field has become an important feature in plasmonics. Especially, if one can control the enhancement factor of a plasmonic device, that is, if the intensity of the optical near field which is excited on a plasmonic object can be adjusted exactly, there will be many novel applications implemented. Based on three-dimensional finite-difference time-domain method, we analyze the interactions of the two identical spherical silver particles with optical waves. Our results show that the electric amplitudes at the midpoint of the two particles are dependent on the direction of the alignment. We convince that by changing the angle between the alignment of the particles and the polarization, the local electric intensity would be tuned well.

Original languageEnglish
Article number59280Y
Pages (from-to)1-6
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1 Dec 2005
Externally publishedYes
EventPlasmonic Nanoimaging and Nanofabrication - San Diego, CA, United States
Duration: 3 Aug 20054 Aug 2005


  • 3D FDTD
  • Nano-optics
  • Surface plasmon

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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