一种集成的全范德瓦尔斯纳米束激光器
An integrated all-van der Waals nanobeam laser
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中文总结 AI 辅助
研究基于WS₂/MoSe₂/WS₂异质结构的全范德瓦尔斯纳米束激光器，通过集成MoSe₂实现最佳增益模式重叠，展示了低温下高效激子 - 腔耦合等特性，验证了激光发射操作，确立其为集成相干光源和量子光子电路的有吸引力平台。
中文摘要 AI 辅助
过渡金属二硫族化合物为集成相干光源提供了一个有前景的平台，但激光发射很大程度上依赖于混合光子架构，缺乏直接的量子光学验证。在此，我们展示了一种基于WS₂/MoSe₂/WS₂异质结构的全范德瓦尔斯（全vdW）高β纳米束激光器，其中MoSe₂单层直接集成在基于WS₂的光学谐振器中以实现最佳增益模式重叠。该器件在低温下表现出高效的激子 - 腔耦合、强定向和线性偏振发射、软非线性输入 - 输出特性以及线宽变窄，实现了β接近1的激光发射操作。激发功率相关的光子自相关测量揭示了从热光子统计到泊松光子统计的转变，直接验证了激光发射操作。此外，自相关的时间展宽揭示了波动主导的激光动力学。这些结果确立了全vdW异质结构作为层状材料光子架构中集成相干光源和可扩展量子光子电路的极具吸引力的平台。
英文摘要
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-$β$ 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 $β$ 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.
