Efficient excitation of dye molecules for single photon generation
Efficient excitation of dye molecules for single photon generation
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DOI：
10.1088/2399-6528/aaf09a
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发表时间：
2018-11-01
影响因子：
1.2
通讯作者：
Clark, Alex S.
中科院分区：
文献类型：
--
作者：
Schofield, Ross C.;Major, Kyle D.;Clark, Alex S.
量子技术的许多方面都需要可靠的单光子源。有机分子对于这种应用是有吸引力的，因为它们可以具有高量子产率并且即使在室温下也可以是光稳定的。为了以高概率产生光子，激光必须有效地激发分子。我们开发了一个简单的模型的效率，并讨论如何优化它。我们证明了我们的模型的有效性，通过实验上的一个单一的二苯并三萘（DBT）分子在蒽晶体。我们发现，在室温下，激发概率不能超过75%，但可以增加到99%以上，如果样品冷却到液氮温度。仅用适度冷却的高光子产生效率的可能性是朝向简单且实用的可靠光子源的重要一步。
A reliable single photon source is required for many aspects of quantum technology. Organic molecules are attractive for this application because they can have high quantum yield and can be photostable, even at room temperature. To generate a photon with high probability, a laser must excite the molecule efficiently. We develop a simple model for that efficiency and discuss how to optimise it. We demonstrate the validity of our model through experiments on a single dibenzoterrylene (DBT) molecule in an anthracene crystal. We show that the excitation probability cannot exceed 75% at room temperature, but can increase to over 99% if the sample is cooled to liquid nitrogen temperature. The possibility of high photon generation efficiency with only modest cooling is a significant step towards a reliable photon source that is simple and practical.