標題: Giant photoluminescence enhancement in tungsten-diselenide-gold plasmonic hybrid structures
作者: Wang, Zhuo
Dong, Zhaogang
Gu, Yinghong
Chang, Yung-Huang
Zhang, Lei
Li, Lain-Jong
Zhao, Weijie
Eda, Goki
Zhang, Wenjing
Grinblat, Gustavo
Maier, Stefan A.
Yang, Joel K. W.
Qiu, Cheng-Wei
Wee, Andrew T. S.
電子物理學系
Department of Electrophysics
公開日期: 五月-2016
摘要: Impressive properties arise from the atomically thin nature of transition metal dichalcogenide two-dimensional materials. However, being atomically thin limits their optical absorption or emission. Hence, enhancing their photoluminescence by plasmonic nanostructures is critical for integrating these materials in optoelectronic and photonic devices. Typical photoluminescence enhancement from transition metal dichalcogenides is 100-fold, with recent enhancement of 1,000-fold achieved by simultaneously enhancing absorption, emission and directionality of the system. By suspending WSe2 flakes onto sub-20-nm-wide trenches in gold substrate, we report a giant photoluminescence enhancement of similar to 20,000-fold. It is attributed to an enhanced absorption of the pump laser due to the lateral gap plasmons confined in the trenches and the enhanced Purcell factor by the plasmonic nanostructure. This work demonstrates the feasibility of giant photoluminescence enhancement in WSe2 with judiciously designed plasmonic nanostructures and paves a way towards the implementation of plasmon-enhanced transition metal dichalcogenide photodetectors, sensors and emitters.
URI: http://dx.doi.org/10.1038/ncomms11283
http://hdl.handle.net/11536/133646
ISSN: 2041-1723
DOI: 10.1038/ncomms11283
期刊: NATURE COMMUNICATIONS
Volume: 7
顯示於類別:期刊論文