Bichromatic Imaging of Single Molecules in an Optical Tweezer Array
Bichromatic Imaging of Single Molecules in an Optical Tweezer Array
复制标题
光镊阵列中单分子的双色成像
DOI：
10.1103/physrevlett.131.053202
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发表时间：
2023
影响因子：
8.6
通讯作者：
Cheuk, Lawrence W.
中科院分区：
文献类型：
--
作者：
Holland, Connor M.;Lu, Yukai;Cheuk, Lawrence W.
我们报告了一种新型双色荧光成像方案，用于无背景检测光镊阵列中捕获的单个 CaF 分子。通过收集一个光学跃迁上的荧光，同时使用另一个光学跃迁进行激光冷却，我们实现了 97.7(2)% 的成像保真度和 95.5(6)% 的无损检测保真度。值得注意的是，这些保真度是通过适度的光子预算实现的，这表明该方法可以扩展到具有不太有利的光学循环特性的更复杂的激光可冷却分子。我们还报告了一个框架和新方法来表征捕获分子荧光检测期间通常发生的各种损失机制，包括双光子衰变和捕获光诱导的更高激发态的混合。特别是，我们开发了一种新方法来分散测量电子激发态之间的跃迁矩阵元素。该方法还可用于测量电子激发态之间任意小的弗兰克-康登因子，这可以极大地帮助正在进行的激光冷却复杂多原子分子的努力。
We report on a novel bichromatic fluorescent imaging scheme for background-free detection of single CaF molecules trapped in an optical tweezer array. By collecting fluorescence on one optical transition while using another for laser cooling, we achieve an imaging fidelity of 97.7(2)% and a nondestructive detection fidelity of 95.5(6)%. Notably, these fidelities are achieved with a modest photon budget, suggesting that the method could be extended to more complex laser-coolable molecules with less favorable optical cycling properties. We also report on a framework and new methods to characterize various loss mechanisms that occur generally during fluorescent detection of trapped molecules, including two-photon decay and admixtures of higher excited states that are induced by the trapping light. In particular, we develop a novel method to dispersively measure transition matrix elements between electronically excited states. The method could also be used to measure arbitrarily small Franck-Condon factors between electronically excited states, which could significantly aid in ongoing efforts to laser cool complex polyatomic molecules.