Abstract We demonstrate efficient random lasing from microslices containing dye-doped colloidal silica nanoparticles. The nanoparticles with diameters of 20 nm were synthesized by a modified Stober method, having a high emission efficiency and well dispersed in an aqueous medium. From the suspension of the nanoparticles, a film is created via self-assembly of colloidal nanoparticles. After grinding the film, microslices with dimensions of around 100– 200 μ m and thickness of 2 μ m are obtained. Under optical pulse excitation, these microslices emit random lasing. The lasers operate well in the air and also in water. Their emission spectrum and lasing threshold in both conditions are studied and compared. Interestingly, lasing emission can be observed from a laser embedded into the porcine skin tissue. Our work provides a simple technique and architecture for biocompatible random lasers which have potential for biosensing and biological probes.

中文翻译：

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可植入皮肤的基于二氧化硅的生物相容性随机激光器

摘要 我们展示了来自含有染料掺杂胶体二氧化硅纳米粒子的微切片的高效随机激光。直径为 20 nm 的纳米粒子采用改良的 Stober 法合成，具有较高的发射效率，并且在水性介质中分散良好。从纳米颗粒的悬浮液中，通过胶体纳米颗粒的自组装形成薄膜。研磨薄膜后，获得尺寸约为 100-200 μm、厚度为 2 μm 的微切片。在光脉冲激发下，这些微切片发出随机激光。激光器在空气和水中都能很好地工作。研究和比较了它们在两种条件下的发射光谱和激光阈值。有趣的是，可以从嵌入猪皮肤组织的激光中观察到激光发射。