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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：等离子体局部场增强的光捕获生物天线中的共振能量转移辅助随机激射

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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 ～660 nm has been demonstrated. Furthermore, a wavelength tunability of ～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：由于随机激光器的出现，新的光应用已经打开，从生物光子到安全设备。在这里，通过使用广为人知但未开发的蝴蝶豌豆（Clitoria ternatea，CT）花提取物的生物色素，证明了在约660 nm处产生连续波（CW）随机激射。此外，利用CT提取物和市售亚甲基蓝（MB）染料的二元混合物作为增益介质，通过在增益介质中利用共振能量转移（RET）机理，在激光发射中获得了约30 nm的波长可调性。 。在CT提取物与染料的混合物中，生物颜料充当供体，MB染料分子充当受体。在存在最佳浓度的金属（Ag）-半导体（ZnO）散射纳米粒子的情况下，该二元系统的激光发射强度进一步得到了增强。有趣的是，在将Ag纳米等离子体激元加载到ZnO掺杂的二元增益介质中之后，激射阈值已从128 W cm〜（？2）降低到了狭窄的发射峰。由于金属纳米等离子体中强大的局部电场以及ZnO的多重散射效应，与不使用散射体的增益介质相比，激光阈值降低了大约四倍。因此，我们相信我们在波长可调，无毒，生物相容性随机激射方面的发现将开辟新的应用领域，包括低成本生物光子器件的设计。

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