集成飞秒激光写入波导的硼硅酸盐衬底离子阱
Ion trap on borosilicate substrate with integrated femtosecond-laser-written waveguide
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中文总结 AI 辅助
该研究开发了集成飞秒激光写入波导的硼硅酸盐衬底离子阱平台，实现了特定波长光的低损耗传输，经低温$^{40}$Ca$^+$离子系统验证可完成囚禁、穿梭及相干操作，为囚禁离子器件集成光传输提供了可扩展方案。
中文摘要 AI 辅助
我们提出了一种基于硼硅酸盐玻璃的离子阱平台，该平台集成了用于片上光传输的飞秒激光写入波导。光学层与电极衬底物理分离并键合在阱上方，仍与硅基集成兼容。我们在729 nm波长下实现了单模低损耗传输，其模场直径可调，并制备出曲率半径低至6 mm的低损耗弯曲波导；同时将单模工作扩展至405 nm波长。该制备工艺与单层金属表面电极阱的工业制备兼容，包括主动光纤对准与键合。我们在低温囚禁离子系统中使用$^{40}$Ca$^+$验证了该平台，成功实现离子囚禁、将离子穿梭至波导前方区域，以及通过集成波导传输的729 nm光驱动的相干操作。我们表征了暴露的电介质对离子的影响，测得杂散电场在数小时时间尺度上呈现缓慢漂移。该架构与混合微光学（如拾取-放置透镜）兼容，可实现单离子寻址，为囚禁离子器件的集成光传输提供了稳健且可扩展的途径。
英文摘要
We present an ion-trap platform on borosilicate glass with an integrated femtosecond-laser-written waveguide for on-chip light delivery. The optical layer is physically separated from the electrode substrate and bonded atop the trap, remaining compatible with silicon-based integration. We engineer single-mode low-loss guidance at 729 nm with tunable mode-field diameter and achieve low-loss curved waveguides down to a radius of curvature of 6 mm. We also extend single-mode operation to a wavelength of 405 nm. The fabrication process is compatible with the industrial fabrication of a single-metal-layer surface-electrode trap, including active fiber alignment and bonding. We validate the platform in a cryogenic trapped-ion system with $^{40}$Ca$^+$, demonstrating trapping, shuttling the ion to a zone in front of the waveguide, and coherent operations driven by 729 nm light delivered through the integrated waveguide. We characterize the effect of the exposed dielectric on the ion and measure stray electric fields that show slow drift at a timescale of hours. The architecture is compatible with hybrid micro-optics (e.g. pick-and-place lenses) to realize single ion addressing and provides a robust, scalable route to integrated light delivery for trapped-ion devices.
