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Slot antenna as a bound charge oscillator
Jong-Ho Choe1, Ji-Hun Kang, Dai-Sik Kim
1Department of Physics, Korea University, Seoul 136-701, Korea.
Optics Express
|March 16, 2012
Summary
We model optical slot antennas as bound charge oscillators, revealing resonant light scattering properties. This model explains spectral width, influenced by radiative damping, and agrees with rigorous simulations.
Area of Science:
- Optics and Photonics
- Plasmonics
- Nanophotonics
Background:
- Optical slot antennas, fabricated as narrow rectangular holes in metal films, are crucial components in nanophotonic devices.
- Understanding their scattering properties is essential for designing efficient light manipulation systems.
Purpose of the Study:
- To develop a simplified physical model for the resonant light scattering of optical slot antennas.
- To derive a closed-form expression for the scattering spectrum and analyze the factors influencing it.
Main Methods:
- Modeling the slot antenna as a bound charge oscillator.
- Deriving a closed-form expression for the scattering spectrum.
- Analyzing radiative damping effects using the Abraham-Lorentz force.
- Comparing model predictions with finite-difference time-domain (FDTD) simulations.
Main Results:
- Slot antennas can be accurately represented as bound charge oscillators.
- A simple expression for the scattering spectrum was obtained, elucidating the role of the substrate.
- Radiative damping, stemming from the Abraham-Lorentz force, significantly determines the spectral width of the resonance.
- The bound charge oscillator model shows good agreement with FDTD calculations.
Conclusions:
- The bound charge oscillator model offers an intuitive physical understanding of optical slot antenna scattering.
- This model effectively predicts scattering spectra and highlights the dominance of radiative damping.
- The findings facilitate the design and optimization of slot antennas for various photonic applications.
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