Electric field enhancement and light transmission in cylindrical nanoholes

Kevin L. Shuford, Mark A Ratner, Stephen K. Gray, George C Schatz

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The properties of electric fields in subwavelength cylindrical apertures are examined upon excitation by a far-field source. We find that the largest enhancements are localized at the edge of the aperture, close to its rim. Both the entrance and exit rims of the hole can produce intense fields, although at long wavelengths thick slabs lead to smaller fields at the exit rim. The fields display a two lobe angular pattern characteristic of a radiating dipole in the near field. The influence of aperture size and slab thickness on field enhancement is presented. Although there is often a connection between peak transmission and peak field, the two rarely occur at the same wavelength. Enhancements in the electric field intensity can be increased by an order of magnitude by adding a grooved structure around the aperture, which acts as a grating and permits coupling to surface plasmon polaritons. Our results indicate that nanohole systems can be optimized to yield large electric field enhancements, making them an attractive medium for surface enhanced spectroscopies.

Original languageEnglish
Pages (from-to)239-246
Number of pages8
JournalJournal of Computational and Theoretical Nanoscience
Volume4
Issue number2
DOIs
Publication statusPublished - Mar 2007

Fingerprint

light transmission
Light transmission
Electric Field
Enhancement
apertures
rims
Electric fields
electric fields
augmentation
Wavelength
slabs
Surface Plasmon Polariton
wavelengths
Spectroscopy
lobes
polaritons
entrances
far fields
near fields
Near-field

Keywords

  • Field enhancement
  • Light transmission
  • Subwavelength aperture
  • Surface enhanced spectroscopy

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Computational Theory and Mathematics

Cite this

Electric field enhancement and light transmission in cylindrical nanoholes. / Shuford, Kevin L.; Ratner, Mark A; Gray, Stephen K.; Schatz, George C.

In: Journal of Computational and Theoretical Nanoscience, Vol. 4, No. 2, 03.2007, p. 239-246.

Research output: Contribution to journalArticle

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