期刊
OPTICS EXPRESS
卷 20, 期 6, 页码 6521-6526出版社
Optica Publishing Group
DOI: 10.1364/OE.20.006521
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资金
- National Research Foundation of Korea (NRF)
- Korea government (MEST) [2010-0000175, 2010-0028713, 2010-0019171]
- Korea University
- National Research Foundation of Korea [2009-0092831, 2008-0062255, 과06A1102, 2009-0082660, 2008-0059320] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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
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