Microscopic analysis of surface Bloch modes on periodically perforated metallic surfaces and their relation to extraordinary optical transmission

作者：Zhang, Xin; Liu, Haitao^*; Zhong, Ying

来源：Physical Review B, 2014, 89(19): 195431.

DOI：10.1103/PhysRevB.89.195431

• WAVES
• FORMULATION
• PLASMONS
• LIGHT
• THIN

We build up a microscopic description of the surface Bloch mode (SBM) on metallic surfaces patterned with a periodic array of subwavelength holes. The SBM also is called a spoof surface plasmon when metals approach perfect electric conductors at terahertz or microwave frequencies. In the description, the SBM is found to be composed of surface waves on flat metallic surfaces, the surface plasmon polariton (SPP), and the quasicylindrical wave (QCW) launched by every individual hole in the array, which shines new light on the design of perforated metallic surfaces as plasmonic metamaterials. We also establish explicit relations between the macroscopic SBM picture and the microscopic surface-wave picture for explaining the extraordinary optical transmission (EOT) through subwavelength metallic hole arrays. Our analysis shows that the SBM is related tightly to the EOT through a complex pole of the in-plane wave vector at which the SBM and the EOT possess similar field distributions expressed as superpositions of the SPPs and QCWs.

• 出版日期2014-5-21
• 单位天津大学; 南开大学