Terahertz superconducting metamaterials for magnetic tunability

We present the magnetic tunability of a metamaterial made from superconducting niobium nitride film. The inductive-capacitive resonance excited by a normally incident terahertz wave was found to be continuously modulated through an external magnetic field at temperatures below the superconducting transition point. A giant resonance modulation was observed due to a strong magnetic effect, where the variation of the magnetic field alters the intrinsic conductivity of the superconducting film. The high sensitivity of the metamaterial allows us to observe the temperature-dependent magnetic effect, and the magnitude of resonance modulation decreases with increasing temperatures. This work demonstrates that a strong magnetic effect could be implemented as an active control modality in superconducting integrated devices functioning at terahertz frequencies.

[1]  Yi Xiong,et al.  Magnetized plasma for reconfigurable subdiffraction imaging. , 2011, Physical review letters.

[2]  J. Rubinstein,et al.  Kinematic and dynamic vortices in a thin film driven by an applied current and magnetic field , 2013, 1301.3801.

[3]  J. Pendry,et al.  Hiding under the carpet: a new strategy for cloaking. , 2008, Physical review letters.

[4]  P. Kužel,et al.  Far-infrared electrodynamics of thin superconducting NbN film in magnetic fields , 2013, 1312.3776.

[5]  David R. Smith,et al.  Metamaterial Electromagnetic Cloak at Microwave Frequencies , 2006, Science.

[6]  David R. Smith,et al.  Controlling Electromagnetic Fields , 2006, Science.

[7]  N. Fang,et al.  Sub–Diffraction-Limited Optical Imaging with a Silver Superlens , 2005, Science.

[8]  Zhen Tian,et al.  Terahertz superconductor metamaterial , 2010 .

[9]  J. Pendry,et al.  Negative refraction makes a perfect lens , 2000, Physical review letters.

[10]  Steven M. Anlage,et al.  The physics and applications of superconducting metamaterials , 2010, 1004.3226.

[11]  R. Shelby,et al.  Experimental Verification of a Negative Index of Refraction , 2001, Science.

[12]  Steven M. Anlage,et al.  Progress in superconducting metamaterials , 2014, 1403.6514.

[13]  S. Anlage,et al.  Tunability of Superconducting Metamaterials , 2006, IEEE Transactions on Applied Superconductivity.

[14]  S. Maier,et al.  Active control of electromagnetically induced transparency analogue in terahertz metamaterials , 2012, Nature Communications.

[15]  Masayoshi Tonouchi,et al.  Terahertz nonlinear superconducting metamaterials , 2013 .

[16]  F. Lederer,et al.  Coupling between a dark and a bright eigenmode in a terahertz metamaterial , 2009, 0901.0365.

[17]  B. Jin,et al.  Nonlinear response of superconducting NbN thin film and NbN metamaterial induced by intense terahertz pulses , 2013 .

[18]  Xiansong Liu,et al.  Suppression of superconductivity in epitaxial NbN ultrathin films , 2011 .

[19]  Y. Wang,et al.  Plasmon-induced transparency in metamaterials. , 2008, Physical review letters.

[20]  M. Kafesaki,et al.  A comparison of graphene, superconductors and metals as conductors for metamaterials and plasmonics , 2012, 1210.0640.