Two-dimensional transition metal dichalcogenides (TMDCs) show a great potential for optoelectronic applications due to their unique properties. However, the control of their emission through coupling to nanoantennas remains largely unexplored. Importantly, antenna-TMDCs coupling promised to be an effective way for PL control due to the high Purcell enhancement such plasmonic nanostructures can offer. MoSe2, a member of the TMDCs family, is an appealing candidate for coupling to gold plasmonic nanostructures due to its smaller bandgap and higher electron mobility in comparison to the readily used MoS2. Moreover, the PL of MoSe2 occurs in the near-infrared spectral range, where the emissive properties do not suffer from the enhanced dissipation in the gold due to interband transitions.
Here we study the interaction between monolayer MoSe2 and plasmonic dipolar antennas demonstrating efficient control of the PL from the TMDC layer. In our experiments, we transfer an exfoliated monolayer MoSe2 onto an array of rectangular gold nanoantenna whose plasmonic resonances overlap with the PL emission of the material. By varying a thickness of the spacer between the MoSe2 layer and the nanoantenna, we demonstrate tuneable PL from threefold enhancement (sample with spacer) to twice quenching (sample without spacer). Furthermore, the observed PL from the TMDC-antenna system demonstrates polarization-dependent properties, thus offering the possibility of polarization-based PL control. Our experimental results are supported by numerical simulations. To the best of our knowledge, this is the first study of Au-MoSe2 plasmonic hybrid structures realizing flexible PL manipulation, which is promising for future optoelectronic applications.
Haitao Chen, Jiong Yang, Evgenia Rusak, Jakob Straubel, Rui Guo, Ye M. Myint, JiaJie Pei, Manuel Decker, Isabelle Staude, Carsten Rockstuhl, Yuerui Lu, Yuri S. Kivshar, and Dragomir N. Neshev, "Manipulation of photoluminescence of 2D MoSe2 by gold nanoantennas(Conference Presentation)," Proc. SPIE 9932, Carbon Nanotubes, Graphene, and Emerging 2D Materials for Electronic and Photonic Devices IX, 99320C (Presented at SPIE Nanoscience + Engineering: August 28, 2016; Published: 3 November 2016); https://doi.org/10.1117/12.2235726.5167075311001.
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