Cascaded exciton energy transfer in a monolayer semiconductor lateral heterostructure assisted by surface plasmon polariton

Jinwei Shi, Meng-Hsien Lin, I-Tung Chen, Nasim Mohammadi Estakhri, Xin-Quan Zhang, Yanrong Wang, Hung-Ying Chen, Chun-An Chen, Chih-Kang Shih, Andrea Alù, Xiaoqin Li (), Yi-Hsien Lee () and Shangjr Gwo ()
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Jinwei Shi: National Tsing-Hua University
Meng-Hsien Lin: National Tsing-Hua University
I-Tung Chen: National Tsing-Hua University
Nasim Mohammadi Estakhri: University of Pennsylvania
Xin-Quan Zhang: National Tsing-Hua University
Yanrong Wang: Beijing Normal University
Hung-Ying Chen: National Tsing-Hua University
Chun-An Chen: National Tsing-Hua University
Chih-Kang Shih: The University of Texas at Austin
Andrea Alù: The University of Texas at Austin
Xiaoqin Li: The University of Texas at Austin
Yi-Hsien Lee: National Tsing-Hua University
Shangjr Gwo: National Tsing-Hua University

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Atomically thin lateral heterostructures based on transition metal dichalcogenides have recently been demonstrated. In monolayer transition metal dichalcogenides, exciton energy transfer is typically limited to a short range (~1 μm), and additional losses may be incurred at the interfacial regions of a lateral heterostructure. To overcome these challenges, here we experimentally implement a planar metal-oxide-semiconductor structure by placing a WS2/MoS2 monolayer heterostructure on top of an Al2O3-capped Ag single-crystalline plate. We find that the exciton energy transfer range can be extended to tens of microns in the hybrid structure mediated by an exciton-surface plasmon polariton–exciton conversion mechanism, allowing cascaded exciton energy transfer from one transition metal dichalcogenides region supporting high-energy exciton resonance to a different transition metal dichalcogenides region in the lateral heterostructure with low-energy exciton resonance. The realized planar hybrid structure combines two-dimensional light-emitting materials with planar plasmonic waveguides and offers great potential for developing integrated photonic and plasmonic devices.

Date: 2017
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DOI: 10.1038/s41467-017-00048-y

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