Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 7: Semiconductor Lasers
HL 7.3: Vortrag
Montag, 17. März 2025, 15:30–15:45, H14
Quantum optical validation of high-β lasing in monolayer-based self-assembled photonic-defect nanocavities — •Aris Koulas-Simos1, Chirag Palekar1, Kartik Gaur1, Imad Limame1, Bárbara Rosa1, Cun-Zheng Ning2, and Stephan Reitzenstein1 — 1Institut für Festkörperphysik, Teschnische Universität Berlin, 10623 Berlin, Germany — 2College of Integrated Circuits and Optoelectronic Chips, Shenzhen Technology Univesity, Shenzhen 518118, China
Nanolasers based on transition metal dichalcogenides have garnered substantial research interest for innovative photonic applications. This study presents the fabrication of multiple self-assembled photonic defect nanocavities within a single, fully encapsulated WSe2 monolayer integrated into a dielectric distributed Bragg reflector (DBR) structure. Spontaneously formed bubbles during the encapsulation process lead to the generation of photonic-defect nanocavities in the DBR. These structures achieve strong optical lateral confinement and exhibit size-dependent optical characteristics, as confirmed by µPL-measurements in both the real and k-space and numerical cavity simulations. Optical power-dependent investigations conducted at cryogenic temperatures reveal lasing behavior, evidenced by a distinct kink in the input-output curve, accompanied by slight linewidth narrowing and a lineshape transition in two specific devices. Finally, photon-autocorrelation measurements performed on one of these devices provide unequivocal confirmation of a lasing transition [1].
[1] A. Koulas-Simos et al., Laser & Photonics Rev., 2400271 (2024).
Keywords: transition metal dichalcogenides; micro- and nanolasers; high beta-factor; photonic-defect microcavities; photon-autocorrelation studies