The dynamic process and microscopic mechanism of extraordinary terahertz transmission through perforated superconducting films

摘要: Superconductor is a compelling plasmonic medium at terahertz frequencies owing to its intrinsic low Ohmic loss and good tuning property. However, the microscopic physics of interaction between wave superconducting structures still unknown. In this paper, we conducted experiments enhanced transmission through series NbN subwavelength hole arrays, employed hybrid model in theoretical analysis role waves transmission. The calculation provided match experimental data. particular, obtained following results. When width holes far below wavelength, mainly caused by localized resonance around individual holes. On contrary, when are large, scattered array dominate extraordinary surface plasmon polaritions proved be launched on film excitation efficiency increases temperature approaches critical working frequency goes near energy gap frequency. This work will enrich our knowledge optical contribute developing devices.