Optofluidic chlorophyll lasers.
Optofluidic chlorophyll lasers.
复制标题
DOI：
10.1039/c6lc00512h
复制
发表时间：
2016-06-21
期刊：
影响因子：
6.1
通讯作者：
Fan X
中科院分区：
文献类型：
--
作者：
Chen YC;Chen Q;Fan X
叶绿素对光合作用至关重要，也是地球上最丰富的色素之一。利用超高q因子（> - 107）的光流环形谐振器，研究了叶绿素激光器的独特特性和潜在机制。在分离的叶绿素a （Chla）中首次观察到680 nm和730 nm的双激光带。特别是在0.1 mM Chla中实现了730 nm波段的激光，激光阈值仅为8 μJ/mm2。此外，我们观察到两个激光带之间的激光竞争。680 nm波段激光发射的存在可以导致730 nm波段激光发射的猝灭或显著降低，有效地提高了730 nm波段的激光阈值。进一步的浓度依赖性研究，以及理论分析，阐明了决定激光发射波段何时以及为何出现在两个波段之一，或同时出现在两个波段的机制。最后，利用Chla作为荧光共振能量转移的供体，将激光发射扩展到近红外波段，波长位移达到了前所未有的380 nm。我们的工作将为开发新型生物相容性和可生物降解的叶绿素激光器打开一扇门，用于各种应用，如小型化可调谐相干光源和体外/体内生物传感。它还将为叶绿素荧光和植物内部的光合作用过程提供重要的见解。
Chlorophylls are essential for photosynthesis and also one of the most abundant pigments on earth. Using the optofluidic ring resonator of extremely high Q-factors (>107), we investigated unique characteristics and the underlying mechanism of chlorophyll lasers. The chlorophyll lasers with dual lasing bands at 680 nm and 730 nm were observed for the first time in isolated chlorophyll a (Chla). Particularly, laser at the 730 nm band was realized in 0.1 mM Chla with a lasing threshold of only 8 μJ/mm2. Additionally, we observed lasing competition between the two lasing bands. The presence of the laser emission at the 680 nm band can lead to quenching or significant reduction of laser emission at the 730 nm band, effectively increasing the lasing threshold for the 730 nm band. Further concentration dependent studies, along with the theoretical analysis, elucidated the mechanism that determines when and why the laser emission band appears at one of the two bands, or concomitantly at both bands. Finally, Chla was exploited as the donor in fluorescence resonance energy transfer to extend the laser emission into the near infrared regime with an unprecedented wavelength shift as large as 380 nm. Our work will open a door to the development of novel biocompatible and biodegradable chlorophyll based lasers for various applications such as miniaturized tunable coherent light sources and in-vitro/in-vivo biosensing. It will also provide important insight into the chlorophyll fluorescence and photosynthesis processes inside plants.