Slot antenna as a bound charge oscillator

Jong Ho Choe, Ji Hun Kang, Dai Sik Kim, Q. Han Park

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)6521-6526
Number of pages6
JournalOptics Express
Issue number6
Publication statusPublished - 2012 Mar 12

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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