An integrated all-van der Waals nanobeam laser

Aris Koulas-Simos; Pietro Metuh; Athanasios Paralikis; Kartik Gaur; Maximilian Klonz; Imad Limame; Bárbara L. T. Rosa; Chirag C. Palekar; Battulga Munkhbat; Stephan Reitzenstein

arXiv · 2607.21566

An integrated all-van der Waals nanobeam laser

Aris Koulas-Simos·Pietro Metuh·Athanasios Paralikis·Kartik Gaur·Maximilian Klonz·Imad Limame·Bárbara L. T. Rosa·Chirag C. Palekar·Battulga Munkhbat·Stephan Reitzenstein

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Abstract

Transition-metal dichalcogenides offer a promising platform for integrated coherent light sources, yet lasing has largely relied on hybrid photonic architectures without direct quantum-optical verification. Here, we demonstrate an all-van der Waals (all-vdW) high-$\beta$ nanobeam laser based on a WS$_2$/MoSe$_2$/WS$_{2}$ heterostructure, with the MoSe$_2$ monolayer directly integrated in the WS$_{2}$-based optical resonator for optimal gain-mode overlap. The devices exhibit efficient exciton-cavity coupling at cryogenic temperatures, strongly directional and linearly polarized emission, soft nonlinear input-output characteristics and linewidth narrowing, enabling lasing operation with $\beta$ near unity. Excitation-power-dependent photon-autocorrelation measurements reveal a transition from thermal to Poissonian photon statistics, with $g_{\mathrm{peak}}^{(2)}(0)$ decreasing from $(1.28\,\pm\,0.09)$ near threshold to $(1.07\,\pm\,0.07)$ above threshold, directly verifying lasing operation. Furthermore, temporal broadening of the autocorrelation uncovers fluctuation-dominated lasing dynamics. These results establish all-vdW heterostructures as a highly attractive platform for integrated coherent light sources in layered-material photonic architectures and scalable quantum-photonic circuits.

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Aris Koulas-Simos, Pietro Metuh, Athanasios Paralikis, Kartik Gaur, Maximilian Klonz, Imad Limame, Bárbara L. T. Rosa, Chirag C. Palekar, Battulga Munkhbat, Stephan Reitzenstein. 2026-07-23. An integrated all-van der Waals nanobeam laser. https://arxiv.org/abs/2607.21566

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