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

被引：22

作者：

Pan, Zeyu ^{[1
]}

Guo, Junpeng ^{[1
]}

机构：

[1] Univ Alabama, Dept Elect & Comp Engn, Huntsville, AL 35899 USA

来源：

OPTICS EXPRESS | 2013年 / 21卷 / 26期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

PLASMONIC NANOANTENNA ARRAYS; NEAR-FIELD; INFRARED-SPECTROSCOPY; GOLD NANOPARTICLES; BOWTIE APERTURE; SCATTERING; SINGLE; LIGHT; NANOARRAYS; NANORODS;

D O I：

10.1364/OE.21.032491

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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. (C) 2013 Optical Society of America

引用

页码：32491 / 32500

页数：10

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