Unveiling the Optical Emission Channels of Monolayer Semiconductors Coupled to Silicon Nanoantennas

• DOI: 10.1021/acsphotonics.0c01175
• Publication Date: 2020-09-24T01:51:10Z
• Authors: Jean-Marie Poumirol; Ioannis Paradisanos; Shivangi Shree; Gonzague Agez; Xavier Marie; Cédric Robert; Nicolas Mallet; Peter R. Wiecha; Guilhem Larrieu; Vincent Larrey; Frank Fournel; Kenji Watanabe; Takashi Taniguchi; Aurélien Cuche; Vincent Paillard; Bernhard Urbaszek
• Keywords: Purcell effect; Light emission; Trion; Thermophotovoltaic

Monolayers (MLs) of transition metal dichalcogenides (TMDs) such as WSe2 and MoSe2 can be placed by dry stamping directly on broadband dielectric resonators, which have the ability to enhance spontaneous emission rate brightness solid-state emitters at room temperature. We show strongly enhanced directivity modifications in room-temperature photoluminescence mapping experiments. By varying TMD material (WSe2 vs MoSe2) transferred silicon nanoresonators with various designs (planarized nonplanarized), we experimentally separate different physical mechanisms that govern global light enhancement. For MoSe2, address effects Mie resonances strain monolayer. WSe2, an important additional contribution comes from out-of-plane exciton dipoles. This paves way for more targeted TMD-Si nanoresonator structures applications.