Plasmonics have allowed revolutionary progress in field of random lasers through improvement of the lasing property via surface plasmon resonance (SPR). However, localized surface plasmon resonance (LSPR) spectra of conventional metal nanostructures are too narrow to sufficiently cover both the absorption and emission spectra of dyes. Therefore, in this paper, we fabricate a typical Ag-TiO₂ composite nanostructure by a solution-reduction method and dope it into a random-laser system with a dye solution. With the assistance of this new nanostructure with a broadened plasmon-resonance band, the random-lasing device shows a lower threshold, sharper peak, and higher intensity compared with devices with pure TiO₂ nanoparticles (NPs) and mixtures of TiO₂ and Ag NPs as scattering media. The results further stimulate consideration of the plasmon effects in random laser systems and help in the design of high-performance, cost-effective random laser devices.

等离子体技术通过改善表面等离子体激元共振（SPR）的激光发射性能，在随机激光领域取得了革命性的进展。然而，常规金属纳米结构的局部表面等离子体激元共振（LSPR）光谱太窄而不能充分覆盖染料的吸收光谱和发射光谱。因此，在本文中，我们通过溶液还原法制备了典型的Ag-TiO ₂复合纳米结构，并用染料溶液将其掺杂到无规激光系统中。与具有纯TiO ₂纳米颗粒（NPs）和TiO ₂混合物的设备相比，借助这种具有宽等离激元共振带的新型纳米结构，随机激射设备显示出更低的阈值，更尖锐的峰和更高的强度。和银纳米颗粒作为散射介质。结果进一步激发了对随机激光系统中的等离激元效应的考虑，并有助于设计高性能，具有成本效益的随机激光设备。