Abstract-Nonlinear terahertz superconducting plasmonics

Jingbo Wu¹, Caihong Zhang², Lanju Liang¹, Biaobing Jin^1,a), Iwao Kawayama²,Hironaru Murakami², Lin Kang¹, Weiwei Xu¹, Huabing Wang^1,3, Jian Chen¹,Masayoshi Tonouchi^2,a) and Peiheng Wu^1,a)
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a) Electronic addresses: bbjin@nju.edu.cn; tonouchi@ile.osaka-u.ac.jp; and phwu@nju.edu.cn
Appl. Phys. Lett. 105, 162602 (2014); http://dx.doi.org/10.1063/1.4898818

http://scitation.aip.org/content/aip/journal/apl/105/16/10.1063/1.4898818

Nonlinear terahertz (THz) transmission through subwavelength hole array in superconductingniobium nitride (NbN) film is experimentally investigated using intense THz pulses. The good agreement between the measurement and numerical simulations indicates that the field strength dependent transmission mainly arises from the nonlinear properties of thesuperconducting film. Under weak THz pulses, the transmission peak can be tuned over a frequency range of 145 GHz which is attributed to the high kinetic inductance of 50 nm-thick NbN film. Utilizing the THz pump-THz probe spectroscopy, we study the dynamic process of transmission spectra and demonstrate that the transition time of such superconducting plasmonic device is within 5 ps.