Tunable enhanced spontaneous emission in plasmonic waveguide cladded with liquid crystal and low-index metamaterial

被引:10
|
作者
Hao, He [1 ]
Ren, Juanjuan [1 ]
Chen, Hongyi [1 ]
Khoo, Iam Choon [3 ]
Gu, Ying [1 ,2 ]
Gong, Qihuang [1 ,2 ]
机构
[1] Peking Univ, Sch Phys, Collaborat Innovat Ctr Quantum Matter, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
[2] Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 020006, Shanxi, Peoples R China
[3] Penn State Univ, Dept Elect Engn, Elect Engn East 121, University Pk, PA 16802 USA
来源
OPTICS EXPRESS | 2017年 / 25卷 / 04期
基金
中国国家自然科学基金;
关键词
BIREFRINGENCE; SURFACES;
D O I
10.1364/OE.25.003433
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
The control and enhancement of the spontaneous emission (SE) of emitters embedded in subwavelength structures are fundamentally interesting and of practical interest. For example, in plasmonic lasers and on-chip single photon sources, a large SE rate and the active modulation of SE over a very broad spectral band are highly desired functionalities. In this paper, we demonstrate by an explicit theoretical calculation that a plasmonic waveguide cladded with liquid crystals (LCs) and low-index metamaterials can give rise to an enhancement in the intrinsic SE rate gamma(0) of more than two orders of magnitude. Furthermore, by varying the refractive index of the LC cladding, thereby changing the density of states of the surface plasmons, the enhanced SE rate can be modulated over a very large range, e.g., from 131 gamma(0) to 327 gamma(0). In general, the modulation range increases with the anisotropy in the refractive index of the LC, while for a fixed range of modulation, the SE rate is larger with lower cladding indices. These results for active modulation and enhanced SE may find application in enabling low-threshold plasmonic nanolasers and tunable on-chip single photon sources. (C) 2017 Optical Society of America
引用
收藏
页码:3433 / 3444
页数:12
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