Wu Dongda, Wang Yi, Liu Yujun, La Junqiao, He Shijia, Lv Fanzhou, Wang Wenxin
College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, P. R. China.
Qingdao Innovation and Development Center of Harbin Engineering University, Harbin Engineering University, 266500 Qingdao, P. R. China.
ACS Appl Mater Interfaces. 2023 Mar 29;15(12):16198-16203. doi: 10.1021/acsami.2c22139. Epub 2023 Mar 15.
The light-matter interactions at nanoscale can be enhanced by Bloch-surface plasmon polariton (Bloch-SPP) on the plasmonic lattice. An Ag nanohole array in hexagonal arrangement served as an optical cavity to realize the directional and polarized amplified spontaneous emission (ASE) of R6G. A 100-fold enhanced ASE was observed at 15° emission angle under TM polarization when the pump power density exceeded the threshold of 198 W/cm based on the degenerated high state density modes. Moreover, a specific polarization dependence of ASE was modulated by the Bloch-SPP modes, and the degree of polarization was enhanced from 1.3 to 2.1 when the pump power density exceeded the threshold of ASE. This work clarifies the interaction between the gain media and plasmonic systems, which lays a foundation for the plasmonic device designing.
纳米尺度下的光与物质相互作用可通过等离子体晶格上的布洛赫表面等离激元极化激元（Bloch-SPP）得到增强。六边形排列的银纳米孔阵列用作光学腔，以实现罗丹明6G（R6G）的定向和偏振放大自发辐射（ASE）。当泵浦功率密度超过基于简并高态密度模式的198 W/cm²阈值时，在TM偏振下15°发射角处观察到ASE增强了100倍。此外，ASE的特定偏振依赖性由Bloch-SPP模式调制，当泵浦功率密度超过ASE阈值时，偏振度从1.3提高到2.1。这项工作阐明了增益介质与等离子体系统之间的相互作用，为等离子体器件设计奠定了基础。
