Extraordinary terahertz transmission in superconducting subwavelength hole array.
We report the extraordinary terahertz (THz) transmission through subwavelength hole array in superconducting NbN film. As the temperature drops below the superconducting transition temperature, the transmission spectra experience distinct changes. The extraordinary transmission is greatly enhanced in superconducting state due to the enhancement of surface plasmon polaritons (SPPs) and localized surface plasmons (LSPs). We have also observed temperature-dependent resonance frequency shift, which mainly depends on the coupling between SPPs and LSPs.
Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing, China.
Jingbo
J
Wu
Hao
H
Dai
Hao
H
Wang
Biaobing
B
Jin
Tao
T
Jia
Caihong
C
Zhang
Chunhai
C
Cao
Jian
J
Chen
Lin
L
Kang
Weiwei
W
Xu
Peiheng
P
Wu
D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008567:Membranes, Artificial; D012031:Refractometry / Q000295:instrumentation*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D055053:Terahertz Radiation
D008567:Membranes, Artificial