YBa
                  2
                    Cu
                  3
                  O
                    7
                    −
                    δ
           quasioptical detectors for fast time-domain analysis of terahertz synchrotron radiation

Probst, P.; Scheuring, A.; Hofherr, M.; Rall, D.; Wünsch, Stefan; Ilin, K.; Siegel, M.; Semenov, A. D.; Pohl, Andreas; Hübers, Heinz‐Wilhelm; Judin, V.; Müller, Anke-Susanne; Hoehl, Arne; Müller, Ralph H.; Ulm, G.

doi:10.1063/1.3546173

Cited by 23 publications

(13 citation statements)

References 15 publications

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“…As the value of the bias voltage U b is increased, the different curves show an increase in the QCL current but maintain the same general pulse shape. The detector signals depend linearly on the coupled radiation power due to the wide dynamic range of these detectors (see later and [26], [34]). In contrast to the QCL current, the measured detector signals show a strong variation in both the amplitude and shape of the pulses, as shown in Fig.…”

Section: Measurement Results and Analysismentioning

confidence: 99%

“…The geometry and operating conditions for both detector types are listed in Table I. Further details about the detector fabrication can be found in [25] for the NbN and [26] for the YBCO technologies. Owing to the sub-wavelength geometry, the detector bridges were embedded into a planar log-spiral antenna, made from 200-nm-thick gold, to improve the input radiation coupling efficiency.…”

Section: Methodsmentioning

confidence: 99%

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Transient Analysis of THz-QCL Pulses Using NbN and YBCO Superconducting Detectors

Scheuring

Dean

Valavanis

et al. 2013

IEEE Trans. THz Sci. Technol.

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Abstract-We report the time-domain analysis of fast pulses emitted by a quantum cascade laser (QCL) operating at ~3.1 THz using superconducting THz detectors made from either NbN or YBa 2 Cu 3 O 7- (YBCO) thin films. The ultra-fast response from these detectors allows resolution of emission features occurring on a nanosecond time-scale, which is not possible with commercially available Ge or InSb bolometers owing to their much larger time constants. We demonstrate that the timedependent emission can be strongly affected by relatively small variations in the driving pulse. The QCL output power-current relationship was determined, based on correlation of the timedependent emission of radiation with current flow in the QCL, under different QCL bias conditions. We show that this relationship differs from that obtained using bolometric detectors that respond only to the integrated pulse energy. The linearity of the detectors, and their agreement with measurements using a Ge bolometer, was also established by studying the QCL emission as a function of bias voltage and excitation pulse length. This measurement scheme could be readily applied to the study of ultra-fast modulation and mode-locking of THz-QCLs.

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Section: Measurement Results and Analysismentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Transient Analysis of THz-QCL Pulses Using NbN and YBCO Superconducting Detectors

Scheuring

Dean

Valavanis

et al. 2013

IEEE Trans. THz Sci. Technol.

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“…For ultimate time resolution and highly sensitive detectors, the film thickness of the detecting element has to be minimized. Recently we demonstrated the successful detection of synchrotron THz pulses with our thin-film YBCO detectors [5]. These measurements revealed a nonbolometric detection mechanism.…”

Section: Introductionmentioning

confidence: 95%

Magnetoresistivity of thin YBa2Cu3O7−δ films on sapphire substrate

Probst

Ilin

Engel

et al. 2012

Physica C: Superconductivity

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Magnetoresistivity of YBa2Cu3O7− films with thicknesses between 7 and 100 nm deposited on CeO2 and PrBa2Cu3O7− buffer layers on sapphire substrate has been measured to analyze the temperature dependence of the second critical magnetic field Bc2. To define Bc2, the mean-field transition temperature Tc was evaluated by fitting the resistive transition in zero magnetic field with the fluctuation conductivity theory of Aslamazov and Larkin. At T → Tc the Bc2(T) dependence shows a crossover from downturn to upturn curvature with the increase in film thickness. AbstractMagnetoresistivity of YBa 2 Cu 3 O 7- ultra-thin films with thicknesses between 7 and 100 nm deposited on sapphire substrate using CeO 2 and PrBa 2 Cu 3 O 7- buffer layers has been measured to analyze temperature dependence of the second critical magnetic field B c2 . B c2 was determined using T c values obtained by fitting of resistivity vs. temperature data with the fluctuation conductivity theory of Aslamazov-Larkin. At T  T c the B c2 (T) dependence shows a crossover from downturn to upturn curvature with the increase of the YBCO film thickness.

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“…Superconducting hot-electron bolometers (HEB) are promising candidates for fast direct detection of THz radiation [5][6][7]. YBCO microbridges have shown even faster photoresponse to THz radiation [8] as well as at optical through infrared wavelengths [9][10][11][12]. At optical wavelengths the relaxation time of the detector was found to be in the range of only a few picoseconds due to strong electron-phonon interaction [9,12].…”

Section: Introductionmentioning

confidence: 99%

Superconducting YBa2Cu3O7−δ Thin Film Detectors for Picosecond THz Pulses

et al. 2012

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Ultra-fast THz detectors from superconducting YBa 2 Cu 3 O 7−δ (YBCO) thin films were developed to monitor picosecond THz pulses. YBCO thin films were optimized by the introduction of CeO 2 and PrBaCuO buffer layers. The transition temperature of 10 nm thick films reaches 79 K. A 15 nm thick YBCO microbridge (transition temperature-83 K, critical current density at 77 K-2.4 MA/cm 2 ) embedded in a planar log-spiral antenna was used to detect pulsed THz radiation of the ANKA storage ring. First time resolved measurements of the multi-bunch filling pattern are presented.

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YBa 2 Cu 3 O 7 − δ quasioptical detectors for fast time-domain analysis of terahertz synchrotron radiation

Cited by 23 publications

References 15 publications

Transient Analysis of THz-QCL Pulses Using NbN and YBCO Superconducting Detectors

Transient Analysis of THz-QCL Pulses Using NbN and YBCO Superconducting Detectors

Magnetoresistivity of thin YBa2Cu3O7−δ films on sapphire substrate

Superconducting YBa2Cu3O7−δ Thin Film Detectors for Picosecond THz Pulses

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