Fan Tongmiao, Tang Yilin, Lung Shaun, Weissflog Maximilian, Ma Jinyong, Shinde Saniya, Saravi Sina, Nauman Mudassar, Yang Wenkai, Qin Hao, Qiu Shuyao, Sukhorukov Andrey A, Lu Yuerui, Setzpfandt Frank
ARC Centre of Excellence for Transformative Meta-Optical Systems (TMOS), Department of Electronic Materials Engineering, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia.
School of Engineering, College of Engineering, Computing and Cybernetics,The Australian National University, Canberra, Australian Capital Territory 2601, Australia.
Nano Lett. 2025 Aug 6;25(31):11844-11851. doi: 10.1021/acs.nanolett.5c02170. Epub 2025 Jul 23.
Quantum photon pairs play a pivotal role in many quantum applications. Metasurfaces, two-dimensional arrays of nanostructures, have been studied intensively to enhance and control pair generation via spontaneous parametric downconversion (SPDC). Van der Waals (VdW) layered materials have emerged as promising candidates for nonlinear materials in quantum light sources, owing to their high nonlinear susceptibility and compatibility with on-chip integration. In this work, we present the first demonstration of SPDC from a metasurface composed of the VdW material 3R-MoS. The nanoresonators support quasi-bound states in the continuum (qBIC) with a quality factor of up to 120, enhancing light-matter interactions. This design achieves a 20-fold increase in SPDC rate compared to an unstructured film and significantly higher brightness, resulting in enhanced quantum photon-pair generation. This work establishes a new approach for utilizing van der Waals metasurfaces in the generation of quantum photon pairs, opening avenues for advanced quantum applications.
量子光子对在许多量子应用中起着关键作用。超表面，即纳米结构的二维阵列，已被深入研究，以通过自发参量下转换（SPDC）增强和控制光子对的产生。范德华（VdW）层状材料因其高非线性极化率以及与片上集成的兼容性，已成为量子光源中非线性材料的有前途的候选者。在这项工作中，我们首次展示了由VdW材料3R-MoS组成的超表面产生的SPDC。纳米谐振器支持连续谱中的准束缚态（qBIC），品质因数高达120，增强了光与物质的相互作用。与无结构薄膜相比，这种设计使SPDC速率提高了20倍，亮度显著更高，从而增强了量子光子对的产生。这项工作建立了一种在量子光子对产生中利用范德华超表面的新方法，为先进量子应用开辟了道路。
