Adiabatic and nonadiabatic nanofocusing of plasmons by tapered gap plasmon waveguides

被引：129
作者：
Pile, D. F. P.
Gramotnev, D. K.
机构：
[1] Univ Tokushima, Dept Opt Sci & Technol, Fac Engn, Tokushima 7708506, Japan
[2] Queensland Univ Technol, Appl Opt Program, Sch Phys & Chem Sci, Brisbane, Qld 4001, Australia
来源：
APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 04期
基金：
日本学术振兴会;
关键词：
D O I：
10.1063/1.2236219
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Adiabatic and nonadiabatic nanofocusing of plasmons in tapered gap plasmon waveguides is analyzed using the finite-difference time-domain algorithm. Optimal adaptors between two different subwavelength waveguides and conditions for maximal local field enhancement are determined, investigated, and explained on the basis of dissipative and reflective losses in the taper. Nanofocusing of plasmons into a gap of similar to 1 nm width with more than 20 times increase in the plasmon energy density is demonstrated in a silver-vacuum taper of similar to 1 mu m long. Comparison with the approximate theory based on the geometrical optics approximation is conducted.
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