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.
Highlights
Thin lateral heterostructures based on transition metal dichalcogenides have recently been demonstrated
For device applications based on two-dimensional (2D) transition metal dichalcogenides (TMDs), excitons created via local optical or electrical excitation in one TMD material needs to be transferred to different TMD regions in the lateral heterostructures (LHSs) to activate the entire active material
The natural 2D geometric match between the atomically thin LHS and the plasmonic plate confines the excitonic energy in the 2D MOS structure and allows energy carried by surface plasmon polaritons (SPPs) to propagate on the planar waveguide
Summary
Thin lateral heterostructures based on transition metal dichalcogenides have recently been demonstrated. The ultrafast exciton recombination dynamics[12,13,14] seriously restrict the exciton energy transfer distance This limitation is circumvented by coupling the TMD layer to a low-loss plasmonic substrate, which supports waveguiding and energy transfer via SPPs over a sufficiently long distance and offers additional benefits such as the capability of shaping and enhancing the near field[19,20,21]. In contrast to the previously reported exciton-SPP or SPP-exciton conversion in 1D hybrid structures consisting of Ag nanowires and monolayer TMDs22, 23, the demonstrated long-distance exciton energy transfer process contains a complete cascaded exciton–SPP–exciton conversion in a fully planar geometry This hybrid material platform offers promising perspectives in future integrated photonic/plasmonic applications by merging plasmonics with atomically thin semiconductors and their unique heterostructures[24,25,26]
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