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

He Hao, Juanjuan Ren, Hongyi Chen, Iam Choon Khoo, Ying Gu, Qihuang Gong

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

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 γ0 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 131γ0 to 327γ0. 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.

Original languageEnglish (US)
Pages (from-to)3433-3444
Number of pages12
JournalOptics Express
Volume25
Issue number4
DOIs
StatePublished - Feb 20 2017

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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