中国物理B ›› 2022, Vol. 31 ›› Issue (10): 107104-107104.doi: 10.1088/1674-1056/ac8921
• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇 下一篇
Zhen-Long Zhao(赵振龙), Bo-Yu Ji(季博宇), Lun Wang(王伦), Peng Lang(郎鹏), Xiao-Wei Song(宋晓伟)†, and Jing-Quan Lin(林景全)‡
Zhen-Long Zhao(赵振龙), Bo-Yu Ji(季博宇), Lun Wang(王伦), Peng Lang(郎鹏), Xiao-Wei Song(宋晓伟)†, and Jing-Quan Lin(林景全)‡
摘要: Explicit visualization of different components of surface plasmon polaritons (SPPs) propagating at dielectric/metal interfaces is crucial in offering chances for the detailed design and control of the functionalities of plasmonic nanodevices in the future. Here, we reported independent imaging of the vertical and horizontal components of SPPs launched from a rectangular trench in the gold film by a 400-nm laser-assisted near-infrared (NIR) femtosecond laser time-resolved photoemission electron microscopy (TR-PEEM). The experiments demonstrate that distinct imaging of different components of SPPs field can be easily achieved by introducing the 400-nm laser. It can circumvent the risk of sample damage and information loss of excited SPPs field that is generally confronted in the usual NIR laser TR-PEEM scheme. The underlying mechanism for realizing distinct imaging of different components of the SPPs field with two-color PEEM is revealed via measuring the double logarithmic dependence of photoemission yield with the 800-nm and 400-nm pulse powers of different polarizations. Moreover, it is found that the PEEM image quality of the vertical and horizontal components of the SPPs field is nearly independent of the 400-nm pulse polarization. These results pave a way for SPPs-based applications and offer a possible solution for drawing a space—time field of SPPs in three dimensions.
中图分类号: (Exchange, correlation, dielectric and magnetic response functions, plasmons)