Intrinsic picosecond response times of Y–Ba–Cu–O superconducting photodetectors

Lindgren, Mikael; Currie, Marc; Williams, Carlo Kosik; Hsiang, Thomas Y.; Fauchet, P. M.; Sobolewski, Roman; Moffat, Steven; Hughes, Robert A.; Preston, J. S.; Hegmann, Frank A.

doi:10.1063/1.123388

Cited by 100 publications

(65 citation statements)

References 17 publications

(18 reference statements)

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“…Typical intrinsic NbN detector response times are  ≈ 30 ps [28], [29]. For YBCO response times as short as single picoseconds were achieved [30], [31]. These detectors are much faster than commercial Ge or InSb bolometers that exhibit time constants in the microsecond or even millisecond range [32].…”

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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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: 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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“…These receivers are noticeably noisier, compared to low temperature devices, as phonon dynamics play an appreciable role due to the relatively high operating tempe− rature and introduce of excess noise [225,226]. Actually, HTSC HEB mixers are not reaching the sensitivity of low temperature superconducting HEBs, but because of very short electron−phonon relaxation time (t eph »1.1 ps in YBaCuO [227] …”

Section: Superconducting Hot-electron Bolometersmentioning

confidence: 99%

Terahertz detectors and focal plane arrays

Rogalski

Сизов

2011

Opto-Electronics Review

307

225

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Terahertz (THz) technology is one of emerging technologies that will change our life. A lot of attractive applications in security, medicine, biology, astronomy, and non-destructive materials testing have been demonstrated already. However, the realization of THz emitters and receivers is a challenge because the frequencies are too high for conventional electronics and the photon energies are too small for classical optics. As a result, THz radiation is resistant to the techniques commonly employed in these well established neighbouring bands.In the paper, issues associated with the development and exploitation of THz radiation detectors and focal plane arrays are discussed. Historical impressive progress in THz detector sensitivity in a period of more than half century is analyzed. More attention is put on the basic physical phenomena and the recent progress in both direct and heterodyne detectors. After short description of general classification of THz detectors, more details concern Schottky barrier diodes, pair braking detectors, hot electron mixers and field-effect transistor detectors, where links between THz devices and modern technologies such as micromachining are underlined. Also, the operational conditions of THz detectors and their upper performance limits are reviewed. Finally, recent advances in novel nanoelectronic materials and technologies are described. It is expected that applications of nanoscale materials and devices will open the door for further performance improvement in THz detectors.

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“…The very short inelastic electron-phonon scattering time e-ph Ϸ2 ps at temperatures of about T Ϸ85-90 K allows one to suggest YBCO thin films for the development of hot-electron bolometer ͑HEB͒ mixers of electromagnetic radiation with a characteristic Ϫ3 dB rolloff frequency f ro up to 100 GHz. [2][3][4][5] This wide intermediate frequency ͑IF͒ bandwidth of the mixer is very important especially in the terahertz frequency range because of the lack of a tunable local oscillator ͑LO͒ for these frequencies. However, as shown in Ref.…”

Section: Introductionmentioning

confidence: 99%

Microwave mixing in microbridges made from YBa2Cu3O7−x thin films

Ilin

Siegel

2002

Journal of Applied Physics

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We present a systematic study of the response of a YBa 2 Cu 3 O 7Ϫx thin-film microbridge to millimeter wave radiation. The dependencies of the microwave response spectrum on the bias voltage and operating temperature have been measured on samples made from YBa 2 Cu 3 O 7Ϫx films with different thicknesses. Once the bias voltage exceeds the value corresponding to the first maximum of differential resistance, the value of the Ϫ3 dB roll-off frequency of the microbridge response is drastically reduced. On the other hand, at temperatures close to T c the roll-off frequency rises to about 20 GHz. For high resistivity YBa 2 Cu 3 O 7Ϫx films with relatively low upper critical magnetic fields the Ϫ3 dB roll-off frequency is about 7 GHz even at temperatures much smaller than T c . To explain the results obtained we consider the presence of two additive mechanisms that contribute to the YBa 2 Cu 3 O 7Ϫx thin-film microbridge response to microwave radiation: vibration of magnetic vortices and heating of electrons and phonons. The competition between these two mechanisms defines the bias voltage and temperature dependencies of the Ϫ3 dB roll-off frequency as well as the recently reported dependence of the intermediate frequency bandwidth of YBa 2 Cu 3 O 7Ϫx hot-electron bolometer mixers on the local oscillator frequency. Numerical calculations based on this assumption are in a good qualitative agreement with the experimental results.

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Intrinsic picosecond response times of Y–Ba–Cu–O superconducting photodetectors

Cited by 100 publications

References 17 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

Terahertz detectors and focal plane arrays

Microwave mixing in microbridges made from YBa2Cu3O7−x thin films

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