High-Speed Y–Ba–Cu–O Direct Detection System for Monitoring Picosecond THz Pulses

A high-speed YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> direct detection system was developed to monitor terahertz picosecond pulses in the time domain. High-T<sub>C</sub> superconducting thin-film YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> microbridges with critical temperatures of T<sub>C</sub> = 85 K were embedded into a planar log-spiral antenna to couple the broadband terahertz radiation (0.1 -2 THz) of several picosecond pulsed sources. The YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> detectors were installed in a liquid nitrogen cryostat equipped with 18 GHz effective bandwidth readout electronics. THz pulses generated at the electron storage rings ANKA and UVSOR-II have been resolved with a temporal resolution of 30 ps (full width at half maximum) limited by the readout electronics bandwidth. Beam dynamic effects of bursting coherent synchrotron radiation were successfully monitored.

[1]  Glover,et al.  Generation of femtosecond pulses of synchrotron radiation , 2000, Science.

[2]  M. Siegel,et al.  YBa2Cu3O7−δ quasioptical detectors for fast time-domain analysis of terahertz synchrotron radiation , 2011 .

[3]  Semenov,et al.  Analysis of the nonequilibrium photoresponse of superconducting films to pulsed radiation by use of a two-temperature model. , 1995, Physical review. B, Condensed matter.

[4]  M. Lindgren,et al.  Nonequilibrium and bolometric photoresponse in patterned YBa2Cu3O7−δ thin films , 1994 .

[5]  Y. Mathis,et al.  Terahertz Radiation at ANKA, the New Synchrotron Light Source in Karlsruhe , 2003, Journal of biological physics.

[6]  H. Hübers,et al.  Steady-state far-infrared coherent synchrotron radiation detected at BESSY II. , 2002, Physical review letters.

[7]  Gabriel M. Rebeiz,et al.  Double-slot antennas on extended hemispherical dielectric lenses , 1992 .

[8]  S. Casalbuoni,et al.  ELECTRO-OPTICAL SAMPLING OF TERAHERTZ RADIATION EMITTED BY SHORT BUNCHES IN THE ANKA SYNCHROTRON , 2010 .

[9]  Roman Sobolewski,et al.  Ultrafast photoresponse in microbridges and pulse propagation in transmission lines made from high-T/sub c/ superconducting Y-Ba-Cu-O thin films , 1996 .

[10]  M. Siegel,et al.  Nonthermal response of YBaCuO thin films to picosecond THz pulses , 2012, 1204.2754.

[11]  H. Hübers,et al.  Application of Zero-Bias Quasi-Optical Schottky-Diode Detectors for Monitoring Short-Pulse and Weak Terahertz Radiation , 2010, IEEE Electron Device Letters.

[12]  T. Hara,et al.  Tunable narrowband terahertz emission from mastered laser|[ndash]|electron beam|[nbsp]|interaction , 2008 .