Giant photoluminescence enhancement in tungsten-diselenide–gold plasmonic hybrid structures

Zhuo Wang, Zhaogang Dong, Yinghong Gu, Yung-Huang Chang, Lei Zhang, Lain-Jong Li, Weijie Zhao, Goki Eda, Wenjing Zhang, Gustavo Grinblat, Stefan A. Maier, Joel K. W. Yang (), Cheng-Wei Qiu () and Andrew T. S. Wee ()
Additional contact information
Zhuo Wang: NUS Graduate School for Integrative Sciences & Engineering (NGS), National University of Singapore
Zhaogang Dong: Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research)
Yinghong Gu: National University of Singapore
Yung-Huang Chang: National Chiao Tung University
Lei Zhang: National University of Singapore
Lain-Jong Li: King Abdullah University of Science and Technology
Weijie Zhao: National University of Singapore
Goki Eda: National University of Singapore
Wenjing Zhang: National University of Singapore
Gustavo Grinblat: Imperial College London
Stefan A. Maier: Imperial College London
Joel K. W. Yang: Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research)
Cheng-Wei Qiu: NUS Graduate School for Integrative Sciences & Engineering (NGS), National University of Singapore
Andrew T. S. Wee: NUS Graduate School for Integrative Sciences & Engineering (NGS), National University of Singapore

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract 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 ∼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.

Date: 2016
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DOI: 10.1038/ncomms11283

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