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首页> 外文期刊>RSC Advances >Resonance energy transfer-assisted random lasing in light-harvesting bio-antenna enhanced with a plasmonic local field
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Resonance energy transfer-assisted random lasing in light-harvesting bio-antenna enhanced with a plasmonic local field

机译：用等离子体局部域增强光收集生物天线的共振能量转移辅助随机激光

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Thanks to the advent of the random laser, new light applications have opened up, ranging from biophotonic to security devices. Here, by using the well-known but unexplored light-harvesting bio-pigment of butterfly pea (Clitoria ternatea, CT) flower extract, generation of continuous-wave (CW) random lasing at similar to 660 nm has been demonstrated. Furthermore, a wavelength tunability of similar to 30 nm in the lasing emission was obtained by utilizing the resonance energy transfer (RET) mechanism in a gain medium with a binary mixture of CT extract and a commercially available methylene blue (MB) dye as the gain medium. In the CT extract-dye mixture, the bio-pigments are acting as donors and the MB dye molecules are acting as acceptors. Amplification in intensity of the lasing emission of this binary system has further been achieved in the presence of optimized concentrations of metal (Ag)-semiconductor (ZnO) scattering nanoparticles. Interestingly, the lasing threshold has been reduced from 128 to 25 W cm(-2), with a narrowed emission peak just after loading of the Ag nanoplasmon in the ZnO-doped binary gain medium. Thanks to the strong localized electric field in the metal nanoplasmon, and the multiple scattering effects of ZnO, the lasing threshold was reduced by approximately four times compared to that of the gain medium without the use of scatterers. Thus, we believe that our findings on wavelength-tunable, non-toxic, biocompatible random lasing will open up new applications, including the design of low-cost biophotonic devices.
机译：由于随机激光的出现，新的光应用已打开，从生物照相到安全设备。在这里，通过使用蝴蝶豌豆（Clitoria Ternatea，CT）花提取物的众所周知但未探测的光收获生物颜料，已经证明了类似于660nm的连续波（CW）随机激光的产生。此外，通过利用CT提取物的二元混合物和作为增益的市售亚甲基蓝（MB）染料，通过利用增益介质中的共振能量转移（RET）机理，获得激光发射中相似于30nm的波长可调性。作为增益中等的。在CT提取物混合物中，生物颜料用作供体，MB染料分子用作受体。在该二元体系的激光发射强度的扩增在存在优化的金属（Ag） - 血液导体（ZnO）散射纳米粒子的情况下进一步实现。有趣的是，激光阈值从128〜25W厘米（-2）减少，在ZnO掺杂二进制增益介质中加载Ag纳米载载量之后的狭窄发射峰值。由于金属纳米载体中的强局部电场，以及ZnO的多个散射效果，与增益介质的相比，激光阈值减小了大约四次，而不会使用散射体。因此，我们认为，我们对波长可调，无毒，生物相容性随机激光的发现将开辟新的应用，包括低成本生物光学器件的设计。

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    《RSC Advances》 |2019年第65期|共9页
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  • 正文语种 eng
  • 中图分类 化学;
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