Slot antenna as a bound charge oscillator

被引：49

作者：

Choe, Jong-Ho ^{[1
]}

Kang, Ji-Hun ^{[1
]}

Kim, Dai-Sik ^{[2
]}

Park, Q-Han ^{[1
]}

机构：

[1] Korea Univ, Dept Phys, Seoul 136701, South Korea

[2] Seoul Natl Univ, Dept Phys & Astron, Seoul 151747, South Korea

来源：

OPTICS EXPRESS | 2012年 / 20卷 / 06期

基金：

新加坡国家研究基金会;

关键词：

DIFFRACTION; APERTURE;

D O I：

10.1364/OE.20.006521

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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. (C) 2012 Optical Society of America

引用

页码：6521 / 6526

页数：6

共 13 条

[1]

[Anonymous], 2001, CLASSICAL ELECTRODYN

[2] Theory of diffraction by small holes [J].