Strong coupling between a dipole emitter and localized plasmons: enhancement by sharp silver tips

被引：27
作者：
D'Agostino, Stefania [1 ,2 ,3 ]
Alpeggiani, Filippo [1 ,2 ]
Andreani, Lucio Claudio [1 ,2 ]
机构：
[1] Univ Pavia, Dipartimento Fis, I-27100 Pavia, Italy
[2] CNISM, I-27100 Pavia, Italy
[3] UNILE, Ist Italiano Tecnol, Ctr Biomol Nanotechnol, I-73010 Arnesano, Italy
来源：
OPTICS EXPRESS | 2013年 / 21卷 / 23期
关键词：
SINGLE QUANTUM-DOT; SYSTEM;
D O I：
10.1364/OE.21.027602
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In this work sharp silver nanotips are analyzed and proposed as useful plasmonic tools to reduce the threshold for the onset of strong coupling in the electromagnetic interaction of a point-like emitter with localized surface plasmons. If compared to similarly-sized spherical nanoparticles, conically-shaped nanoparticles turn out to be extremely useful to reduce the oscillator strength requirements for the emitting dipole, a reduction of the threshold by one sixth being obtained in a double cone configuration. Moreover the transition to the strong coupling regime is analyzed for several cone apertures, revealing a nonmonotonic behavior with the appearance of an optimal cone geometry. The emitted-light spectrum is obtained from the computation of the perturbative decay rate and photonic Lamb shift in the classical framework of the Discrete Dipole Approximation. This combined classical-quantum electrodynamics treatment is useful for the theoretical investigation on nonperturbative light-matter interactions involving complex shaped nanoparticles or aggregates. (C) 2013 Optical Society of America
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收藏
页码：27602 / 27610
页数：9
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