標題: Coherent and Polarized Random Laser Emissions from Colloidal CdSe/ZnS Quantum Dots Plasmonically Coupled to Ellipsoidal Ag Nanoparticles
作者: Yao, Yung-Chi
Yang, Zu-Po
Hwang, Jung-Min
Su, Hai-Ching
Haung, Jing-Yu
Lin, Tzu-Neng
Shen, Ji-Lin
Lee, Min-Hung
Tsai, Meng-Tsan
Lee, Ya-Ju
光電系統研究所
光電工程學系
Institute of Photonic System
Department of Photonics
公開日期: Feb-2017
摘要: This study demonstrates the capability of controlling optical anisotropy of lasing emissions by manipulating the coupling strength spatially and spectrally between the oscillated electric field of emitted light and the localized surface plasmon (LSP) resonance for a random lasing medium composed of colloidal CdSe/ZnS quantum dots (QDs) and ellipsoidal silver nanoparticles (Ag NPs). Distinctive from the amplified spontaneous emission generally observed on colloidal CdSe/ZnS QDs, it has been found that lasing emissions of the revealed system exhibit clear interference features (coherent optical feedbacks) with low-threshold characteristics, mainly attributed to enhanced light scatterings and optical gains arisen in peripheral surfaces of ellipsoidal Ag NPs. Importantly, the relative orientation, between the oscillated electric field of emitted light from colloidal CdSe/ZnS QDs and the ellipse axis of Ag NPs, plays a critical role in selective excitation of LSP resonances leading to laser emissions with preferential optical polarizations. The achievement of spatial and spectral coupling of LSP resonance with colloidal QDs, respectively, by spin coating thin QDs film on Ag NPs and control of the Ag NP geometry makes the present system one of the promising candidates of colloidal QDs-based random lasers to achieve coherent and polarized lasing emissions.
URI: http://dx.doi.org/10.1002/adom.201600746
http://hdl.handle.net/11536/133193
ISSN: 2195-1071
DOI: 10.1002/adom.201600746
期刊: ADVANCED OPTICAL MATERIALS
Volume: 5
Issue: 3
Appears in Collections:Articles