可重构光阱阵列中的直接与介导偶极-偶极相互作用
Direct and mediated dipole-dipole interactions in a reconfigurable array of optical traps
AI总结：
针对光阱阵列中独立控制粒子间相互作用的难题，研究引入辅助纳米粒子作为耦合器，在可重构三粒子阵列中实现了直接偶极-偶极相互作用的广泛可调谐性，并观察到介导相互作用的光谱特征，为多粒子阵列的定制化控制提供了实用途径。
摘要：
真空中的光悬浮纳米粒子同时经历静电和光诱导的偶极-偶极相互作用，为探索介观纠缠和多体动力学提供了多功能平台。光阱阵列中的一个重大挑战是实现位置分辨的点对点可调谐性：调整单个阱的激光参数通常会对相邻位置产生全局串扰，阻碍独立控制。受超导电路中可调耦合器的启发，我们引入了一个辅助纳米粒子，作为两个目标纳米粒子之间的耦合器。在可重构的三粒子阵列中，我们通过控制阱的相位和位置，展示了直接偶极-偶极相互作用的广泛可调谐性。此外，我们观察到了与目标粒子之间通过辅助粒子产生的介导相互作用相一致的光谱特征，表现为超出非耦合响应的模式参与。我们的结果为多粒子光阱阵列中定制化的、位置分辨的控制建立了一条实用途径，扩展了光学束缚工具箱，并为与宏观量子力学和精密传感相关的可编程振荡器网络开辟了新机遇。
英文摘要：
Optically levitated nanoparticles in vacuum experience both electrostatic and light-induced dipole-dipole interactions, offering a versatile platform to explore mesoscopic entanglement and many-body dynamics. A significant challenge in optical trap arrays is to achieve site-resolved, point-to-point tunability: adjusting the laser parameters of a single trap typically induces global cross-talk to neighboring sites, hindering independent control. Inspired by tunable couplers in superconducting circuits, we implement an ancillary nanoparticle that functions as a coupler between two target nanoparticles. Within a reconfigurable three-particle array, we demonstrate broad tunability of the direct dipole-dipole interaction by controlling the phase and position of the traps. In addition, we observe spectral signatures consistent with mediated interactions between the target particles via the ancillary one, manifested as mode participation beyond the uncoupled response. Our results establish a practical route to tailored, site-resolved control in multi-particle optical trap arrays, expanding the optical-binding toolbox and opening opportunities for programmable oscillator networks relevant to macroscopic quantum mechanics and precision sensing.
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