AI 中文总结
该研究利用硅超表面的手性光-物质耦合，实现有机手性激子-极化激元的选择性传输，其不对称因子达0.93，传播距离超50μm，较裸激子提升3个数量级，为自旋选择性极化激元技术奠定基础。
AI 中文摘要
激子-极化激元为操控杂化光-物质态提供了强大平台，这类准粒子具有低有效质量与强非线性。在这些准粒子中引入手性，可实现对其自旋与传播的选择性操控，为手性传输及自旋选择性极化激元器件开辟了新机遇。我们利用由倾斜纳米棒二聚体构成的硅超表面中强的手性光-物质耦合，实现了有机手性激子-极化激元的选择性传输。该超表面支持表面晶格共振与连续态中的准束缚态，二者同时提供高光限制与外禀手性，从而在非手性分子中产生手性激子-极化激元。这些激子-极化激元表现出大的不对称因子，达到0.93。通过光致发光傅里叶显微术与实空间成像，我们证实手性激子-极化激元的传播距离超过50μm，且其不对称因子无明显衰减，特征传播长度约为6-13μm，这些传播长度相较于裸激子提升了3个数量级。本工作首次展示了由强光-物质耦合驱动的、在非手性超表面中有机激子-极化激元的增强且选择性手性传输，为采用简单超表面的自旋选择性极化激元技术铺平了道路。
英文摘要
Exciton-polaritons provide a powerful platform for manipulating hybrid light-matter states with low effective masses and strong nonlinearities. Introducing chirality into these quasiparticles enables selective control over their spin and propagation, opening new opportunities for chiral transport and spin-selective polaritonic devices. We exploit the strong chiral light-matter coupling in silicon metasurfaces composed of tilted nanorod dimers to demonstrate selective transport of organic chiral exciton-polaritons. The metasurface supports surface lattice resonances and quasi-bound states in the continuum that simultaneously provide high photonic confinement and extrinsic chirality, giving rise to chiral exciton-polaritons in the achiral molecules. These exciton-polaritons exhibit a large magnitude of the dissymmetry factor, reaching a value of 0.93. Using photoluminescence Fourier microscopy and real-space imaging, we show that chiral exciton-polaritons propagate over distances exceeding 50 um without significant degradation of their dissymmetry, with characteristic propagation lengths of approximately 6-13 um. These propagation lengths correspond to an enhancement of 3 orders of magnitude compared to bare excitons. This work constitutes the first demonstration of enhanced and selective chiral transport of organic exciton-polaritons, driven by strong light-matter coupling, in achiral metasurfaces, paving the way for spin-selective polaritonic technologies using simple metasurfaces.
