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Liao, Xing

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Liao

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Xing

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Liao, Xing
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    An Inverse-Designed Nanophotonic Interface for Excitons in Atomically Thin Materials
    (American Chemical Society (ACS), 2023-09-11) Gelly, Ryan; White, Alexander; Scuri, Giovanni; Liao, Xing; Geun Ho, Ahn; Deng, Bingchen; Watanabe, Kenji; Taniguchi, Takashi; Vučković, Jelena; Park, Hongkung
    Efficient nanophotonic devices are essential for applications in quantum networking, optical information processing, sensing, and nonlinear optics. Extensive research efforts have focused on integrating two-dimensional (2D) materials into photonic structures, but this integration is often limited by size and material quality. Here, we use hexagonal boron nitride (hBN), a benchmark choice for encapsulating atomically thin materials, as a waveguiding layer while simultaneously improving the optical quality of the embedded films. When combined with photonic inverse design, it becomes a complete nanophotonic platform to interface with optically active 2D materials. Grating couplers and low-loss waveguides provide optical interfacing and routing, tunable cavities provide a large exciton-photon coupling to transition metal dichalcogenides (TMD) monolayers through Purcell enhancement, and metasurfaces enable the efficient detection of TMD dark excitons. This work paves the way for advanced 2D-material nanophotonic structures for classical and quantum nonlinear optics.