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)
 VIEW AFFILIATIONS
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.

Abstract-Study on terahertz emission and optical/terahertz pulse responses with superconductors

Iwao Kawayama¹, Caihong Zhang¹, Huabing Wang² and Masayoshi Tonouchi¹
http://iopscience.iop.org/0953-2048/26/9/093002;jsessionid=F87B757F752FE819355A675537AF0596.c2

tonouchi@ile.osaka-u.ac.jp
¹ Institute of Laser Engineering, Osaka University, Osaka 565-0871, Japan
² National Institute for Materials Science, Tsukuba 305-0047, Japan

Recent progress in terahertz technology has enabled precise investigation of the ultrafast dynamics of excited carriers, nonequilibrium state and nonlinear response of superconductors, resulting in the proposal of novel optoelectronic device applications based on such ultrafast perturbation of supercarriers in the terahertz frequency region. In this paper, we focus on exploratory research in the field of superconductor terahertz science and technology, and present a review of superconducting terahertz sources and the response of superconductors excited by ultrashort electromagnetic pulses, including optical pulses and high-intensity THz pulses.

Abstract-Linewidth dependence of coherent terahertz emission from Bi2Sr2CaCu2O8 intrinsic Josephson junction stacks in the hot-spot regime

http://prb.aps.org/abstract/PRB/v86/i6/e060505
Mengyue Li^1,2, Jie Yuan^2,3,*, Nickolay Kinev⁴, Jun Li^2,5, Boris Gross⁶, Stefan Guénon⁶, Akira Ishii², Kazuto Hirata², Takeshi Hatano², Dieter Koelle⁶, Reinhold Kleiner⁶, Valery P. Koshelets⁴, Huabing Wang^1,2,†, and Peiheng Wu^1 
1Research Institute of Superconductor Electronics, Nanjing University, Nanjing 210093, China
²National Institute for Materials Science, Tsukuba 3050047, Japan
³Department of Applied Physics, Wuhan University of Science and Technology, Wuhan 430081, China
⁴Kotel'nikov Institute of Radio Engineering and Electronics, Moscow 125009, Russia
⁵Hokkaido University, Hokkaido 0600810, Japan
⁶Physikalisches Institut and Center for Collective Quantum Phenomena in LISA⁺, Universität Tübingen, D-72076 Tübingen, Germany

 Received 3 April 2012; revised 20 July 2012; published 8 August 2012

We report on measurements of the linewidth Δf of terahertz radiation emitted from intrinsic Josephson junction stacks, using a Nb/AlN/NbN integrated receiver for detection. Previous resolution-limited measurements indicated that Δf may be below 1 GHz—much smaller than expected from a purely cavity-induced synchronization. While at low bias we found Δf to be not smaller than ∼500 MHz, at high bias, where a hot spot coexists with regions which are still superconducting, Δfturned out to be as narrow as 23 MHz. We attribute this to the hot spot acting as a synchronizing element. Δf decreases with increasing bath temperature, a behavior reminiscent of motional narrowing in NMR or electron spin resonance (ESR), but hard to explain in standard electrodynamic models of Josephson junctions.

©2012 American Physical Society

URL:

http://link.aps.org/doi/10.1103/PhysRevB.86.060505

DOI:

10.1103/PhysRevB.86.060505

PACS:

74.50.+r, 74.72.-h, 85.25.Cp

^*phy.wust@gmail.com

^†hbwang1000@gmail.com