利用量子跳变探测的光反馈增强单分子光稳定性
Enhancing single-molecule photostability by optical feedback from quantum-jump detection
摘要：
我们报告了一种光学技术，产生的单分子光稳定性的增强，大大抑制光漂白途径，涉及从三重态的光激发。这是通过在光学检测到分子到三重态的量子跳跃时动态关闭激发激光器来实现的。这一过程导致单分子观测时间延长，探测到的光子总数增加。由此产生的光稳定性的改善明确证实了光漂白动力学的三重态光激发的重要性，并可能允许在单分子水平上的新现象的调查。
英文摘要：
We report an optical technique that yields an enhancement of single-molecule photostability, by greatly suppressing photobleaching pathways which involve photoexcitation from the triplet state. This is accomplished by dynamically switching off the excitation laser when a quantum-jump of the molecule to the triplet state is optically detected. This procedure leads to a lengthened single-molecule observation time and an increased total number of detected photons. The resulting improvement in photostability unambiguously confirms the importance of photoexcitation from the triplet state in photobleaching dynamics, and may allow the investigation of new phenomena at the single-molecule level.
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