Enhanced optical absorption and electric field resonance in diabolo metal bar optical antennas | Zendy

Zeyu Pan | Zendy; Junpeng Guo | Zendy

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Enhanced optical absorption and electric field resonance in diabolo metal bar optical antennas

Author(s) -

Zeyu Pan,

Junpeng Guo

Publication year - 2013

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.21.032491

Subject(s) - optics , resonance (particle physics) , materials science , absorption (acoustics) , dipole , electric field , wavelength , finite difference time domain method , physics , nuclear magnetic resonance , atomic physics , quantum mechanics

Resonance behaviors of the fundamental resonance mode of diabolo metal bar optical antennas are investigated by using finite-difference time-domain (FDTD) numerical simulations and a dipole oscillator model. It is found that as the waist of the diabolo metal bar optical antenna is reduced, optical energy absorption cross section and near field enhancement at resonance increase significantly. Also reduction of the diabolo waist width causes red-shift of the resonant wavelengths in the spectra of absorption cross-section, scattering cross-section, and the near electric field. A dipole oscillator model including the self-inductance force is used to fit the FDTD numerical simulation results. The dipole oscillator model characterizes well the resonance behaviors of narrow waist diabolo metal bar optical antennas.

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