Absorptive Fabry–Pérot Interference in a Metallic Nanostructure
Rui Wang1, Yan-Ling Wu2, B. H. Yu2,3, Li-Li Hu2, C. Z. Gu2,3, J. J. Li2,3, Jimin Zhao2,3,4**
1CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190 2Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 3School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049 4Songshan Lake Materials Laboratory, Dongguan 523808
Abstract：In conventional optics, the Fabry–Pérot (FP) effect is only considered for transparent materials at a macroscopic dimension. Down to the nanometer scale, for absorptive metallic structures, the FP effect has not been directly observed so far. It is unclear whether such a macroscopic effect still holds for a subwavelength metallic nanostructure. Here, we demonstrate the probing of FP interference in a series of nanometer-thick Au films with subwavelength hole arrays. The evidence from both linear and second harmonic generation signals, together with angle-resolved investigations, exhibit features of a FP effect. We also derive an absorptive FP interference equation, which well explains our experimental results. Our results for the first time experimentally confirm the long-persisting hypothesis that the FP effect holds ubiquitously in a metallic nanostructure.
. [J]. 中国物理快报, 2019, 36(2): 27801-.
Rui Wang, Yan-Ling Wu, B. H. Yu, Li-Li Hu, C. Z. Gu, J. J. Li, Jimin Zhao. Absorptive Fabry–Pérot Interference in a Metallic Nanostructure. Chin. Phys. Lett., 2019, 36(2): 27801-.
2019, Vol. 36 
