Berlin 2024 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 26: 2D Materials and Heterostructures: Quantum Emitters and Defects
HL 26.7: Talk
Wednesday, March 20, 2024, 11:15–11:30, EW 201
Enhanced light-matter interaction in self-assembled photonic-defect nanocavities with a TMDC monolayer as active material — •Aris Koulas-Simos1, Chirag Palekar1, Kartik Gaur1, Imad Limame1, Ching-Wen Shih1, Bárbara Rosa1, Cun-Zheng Ning2, and Stephan Reitzenstein1 — 1Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany — 2Department of Electronic Enginnering, Tsinghua University, Beijing 100084, China
Micro- and nanolasers utilizing TMDCs as active materials have been gaining significant research popularity for novel photonic applications. Here, we report on the fabrication of multiple self-assembled photonic-defect nanocavities in a single, fully encapsulated WSe2 monolayer embedded in a dielectric distributed Bragg reflector (DBR) structure. The bubble-like Gaussian defect nanocavities provide tight optical lateral confinement and produce diameter-dependent optical signatures distinguishing them from the planar DBR-section, as validated in µPL-measurements and numerical cavity simulations. Last but not least, optical power-dependent studies at cryogenic temperatures reveal an enhanced light matter-interaction through a pronounced kink in the I/O-curve and a slight linewidth narrowing for two specific devices.
Keywords: TMDCs; Micro-and Nanolasers; Self-assembled; Photonic-Defect Cavities