Wan Yuan, Deng Luogen
Opt Express. 2019 Sep 16;27(19):27103-27111. doi: 10.1364/OE.27.027103.
Recyclable coherent random lasers assisted by plasmonic nanoparticles in DCM-PVA thin films are studied. Four DCM-PVA films with different nanoparticles are made, and the radiation characteristics of these random lasers are studied. The results show that the emission spectrum of the DCM-PVA film with Au nanoparticle of 50 nm in diameter is optimal, and its threshold is about 6.53 µJ/pulse. Underlying mechanisms are discussed in detail. Then the DCM-PVA film with Au nanoparticles of 50 nm in diameter is detached from a glass substrate and adhered to different substrates. Coherent random lasers also occur when the sample is based on different substrates. Finally, a method of making samples recyclable is proposed, and the emission spectrum of samples as a function of cycle index is studied. The results show that recyclable coherent random lasers can be realized with this method. This study provides a new way, to the best of our knowledge, to realize recyclable coherent random lasers with low-threshold.
研究了在二氯甲烷-聚乙烯醇（DCM-PVA）薄膜中由等离子体纳米颗粒辅助的可回收相干随机激光器。制备了四种含有不同纳米颗粒的DCM-PVA薄膜，并研究了这些随机激光器的辐射特性。结果表明，直径为50nm的金纳米颗粒的DCM-PVA薄膜的发射光谱最佳，其阈值约为6.53μJ/脉冲。详细讨论了其潜在机制。然后将直径为50nm的金纳米颗粒的DCM-PVA薄膜从玻璃基板上剥离并粘附到不同的基板上。当样品基于不同的基板时也会出现相干随机激光器。最后，提出了一种使样品可回收的方法，并研究了样品发射光谱随循环指数的变化。结果表明，用这种方法可以实现可回收相干随机激光器。据我们所知，本研究为实现低阈值可回收相干随机激光器提供了一种新方法。
