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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 6 — Mar. 12, 2012
  • pp: 6521–6526

Slot antenna as a bound charge oscillator

Jong-Ho Choe, Ji-Hun Kang, Dai-Sik Kim, and Q-Han Park  »View Author Affiliations

Optics Express, Vol. 20, Issue 6, pp. 6521-6526 (2012)

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We study the scattering properties of an optical slot antenna formed from a narrow rectangular hole in a metal film. We show that slot antennas can be modeled as bound charge oscillators mediating resonant light scattering. A simple closed-form expression for the scattering spectrum of a slot antenna is obtained that reveals the nature of a bound charge oscillator and also the effect of a substrate. We find that the spectral width of scattering resonance is dominated by a radiative damping caused by the Abraham-Lorentz force acting on a bound charge. The bound charge oscillator model provides not only an intuitive physical picture for the scattering of an optical slot antenna but also reasonable numerical agreements with rigorous calculations using the finite-difference time-domain method.

© 2012 OSA

OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(050.1960) Diffraction and gratings : Diffraction theory
(050.5745) Diffraction and gratings : Resonance domain
(290.5825) Scattering : Scattering theory
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Diffraction and Gratings

Original Manuscript: August 22, 2011
Revised Manuscript: October 17, 2011
Manuscript Accepted: February 27, 2012
Published: March 6, 2012

Jong-Ho Choe, Ji-Hun Kang, Dai-Sik Kim, and Q-Han Park, "Slot antenna as a bound charge oscillator," Opt. Express 20, 6521-6526 (2012)

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