Optoelectronic generation and detection of single-flux-quantum pulses

Wang, Chia‐Chi; Currie, Marc; Jacobs‐Perkins, D.; Feldman, M.J.; Sobolewski, Roman; Hsiang, Thomas Y.

doi:10.1063/1.113745

Cited by 31 publications

(24 citation statements)

References 5 publications

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“…In recent years superconducting circuits based on single-flux-quantum pulses have been shown to provide a new family of digital electronics with ultra-high speed and very low power-dissipitation. At clock rates exceeding 10 GHz and operation speed of many hundred GHz, these devices can in the future outrun any semiconductor device [7]. Using domain walls as active 'vortex-gates' we may add an additional degree of freedom in these devices.…”

Section: Introductionmentioning

confidence: 99%

Interaction between a magnetic domain wall and a superconductor

et al. 2002

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Section: Introductionmentioning

confidence: 99%

Interaction between a magnetic domain wall and a superconductor

et al. 2002

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“…From a practical point of view, the EO sampler can be regarded as an ultrafast ( 300fs temporal resolution) and ultrasensitive ( 150-voltage sensitivity) sampling oscilloscope. The temporal resolution and field sensitivity have been verified by measurements on a GaAs photoconductive switch [23] and characterization of single-flux-quantum pulses [24].…”

Section: Experimental Methodsmentioning

confidence: 90%

Ultrafast photoresponse in microbridges and pulse propagation in transmission lines made from high-T/sub c/ superconducting Y-Ba-Cu-O thin films

Lindgren

Currie

Williams

et al. 1996

IEEE J. Select. Topics Quantum Electron.

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We report our femtosecond time-resolved measurements of the photoresponse of microbridges in YBa2Cu3O70x (YBCO) thin films, performed using an electrooptic sampling technique. Our test structures consisted of 5-m-wide, 7-m-long microbridges, incorporated in 4-mm-long coplanar waveguides, fabricated in 100-nm-thick, high-quality epitaxial YBCO films grown on LaAlO3 substrates by laser deposition. When varying the biasing conditions between the superconducting and switched states, we observed transients of single-picosecond duration that corresponded to the nonequilibrium kinetic-inductance and the electron-heating response mechanisms, respectively. In both cases, experimental waveforms could be accurately simulated using a nonequilibrium (two-temperature) electron-heating model. From the fits, the YBCO intrinsic temporal parameters associated with the nonequilibrium conditions were extracted. The electron thermalization time was found to be 0.56 ps in the state above the material's critical temperature (T c = 89 K) and 0.9 6 0.1 ps in the superconducting state at temperatures ranging from 20 to 80 K. The electron-phonon energy relaxation time was found to be 1.1 ps. The single-picosecond pulse distortion due to propagation on a YBCO coplanar waveguide was also studied. Our results show that a YBCO microbridge can intrinsically operate as a photodetector at rates exceeding 100 Gb/s, making it useful as an optical-to-electrical transducer for optoelectronic interfaces in YBCO digital electronics. Simultaneously, YBCO mixers, based on hot-electron effects, should exhibit an intrinsic bandwidth exceeding 100 GHz.

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“…A successful integration of subpicosecond circuits with superconductive electronics has been made by Wang et al [6]. Here a voltage pulse was generated by a photoconductive switch and propagated along a Nb microstrip transmission I GaAs…”

Section: Introductionmentioning

confidence: 99%

Generation and propagation of subpicosecond pulses in a photoconductive GaAs switch integrated onto a gold/YBa/sub 2/Cu/sub 3/O/sub x/ coplanar transmission line structure

Larsen

Holst

Shen

et al. 1997

IEEE Trans. Appl. Supercond.

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We present a new type of photoconductive GaAs switch, which can be integrated directly onto an already existing high-T, circuit. Our test circuit consists of two coupled coplanar transmission lines made of gold on top of a YBa,Cu,O, layer grown on a MgO substrate. When the photoconductive switch is irradiated with femtosecond laser pulses, subpicosecond (0.4 ps) electric pulses are created. These pulses are capable of propagating more that 1 m m along the transmission line. The pulses were detected with a photoconductive sampling technique, and results are presented at both room temperature and at 81 K. The photoconductive switch is useful both'as an optical trigger generating pulses and in the sampling system detecting the pulses. This switch can be used to characterize high-T, circuits e.g. SFQ logic in the subpicosecond time domain.

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Optoelectronic generation and detection of single-flux-quantum pulses

Cited by 31 publications

References 5 publications

Interaction between a magnetic domain wall and a superconductor

Interaction between a magnetic domain wall and a superconductor

Ultrafast photoresponse in microbridges and pulse propagation in transmission lines made from high-T/sub c/ superconducting Y-Ba-Cu-O thin films

Generation and propagation of subpicosecond pulses in a photoconductive GaAs switch integrated onto a gold/YBa/sub 2/Cu/sub 3/O/sub x/ coplanar transmission line structure

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