银纳米粒子及薄膜复合结构增强有机分子激射行为的研究 ( 宁舒雅 Journal of Materials Chemistry C, 2016, DOI: 10.1039/C6TC01164K )


2016-06-02
 

Enhancement of Lasing in organic gain media assisted by the metallic nanoparticles-metallic film plasmonic hybrid structure

Shuya Ning1,2, Zhaoxin Wu2, *, Hua Dong2, Lin Ma2, Xun Hou2, and Fanghui Zhang1

1College of Electrical and Information engineering, Shaanxi University of Science and Technology, Xi’an 710021, PR China

2Key Laboratory of Photonics Technology for Information, School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an, 710049, PR China

*zhaoxinwu@mail.xjtu.edu.cn

Abstract: Metallic films were widely used in many micro-cavities or as electrodes. However, the quenching of fluorescent molecules and the large absorption loss of metallic films are generally considered fatal for the lasing. In this article, we present the enhanced lasing of organic gain medium in planar waveguide, assisted by the plasmonic hybrid structure of metallic nanoparticles (NPs)-metallic film. Compared to the gain medium depositing on glass, the lasing threshold of gain medium depositing on plasmonic hybrid structure is reduced by 4.6 times. It is attributed to the hybrid plasmonics coupling between the localized surface plasmons of metallic NPs and the delocalized surface plasmon polariton of metallic film, leading the more intense local electric field of hybrid structure. In addition, the reinjection and confinement of the leaking photons into gain media by the external feedback of metallic film also contributes to the enhanced lasing. Our results could provide us an unique idea to effectively avoid the negative effect of metallic film, enhance the lasing gain of organic dyes molecule, and realize the lower pumped threshold and stronger lasing.

© 2016 Optical Society of America