Response of superconducting films to a periodic optical irradiation

Perrin, N.; Vanneste, Christian

doi:10.1103/physrevb.28.5150

Cited by 73 publications

(43 citation statements)

References 31 publications

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“…Moreover, Figure 4b demonstrates that the responsivity of the device has a linear dependence on the bias current. These two observations confirm our previous theoretical prediction of the linear kinetic inductive response represented by equation (3). This linear response sustains as long as the perturbation in both kinetic inductance and normal resistance is small.…”

supporting

confidence: 79%

“…The interaction of light with superconducting samples is long known to perturb superconductivity [1][2][3][4] , which can be used as a probing mechanism for optoelectronic applications [5][6][7][8][9][10][11][12][13] . In general, photons of energy greater than the Cooper pair binding energy (2∆) can initiate a chain of pair-breaking events resulting in a deviation of the quasiparticle and pair densities from their equilibrium values.…”

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confidence: 99%

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Ultrafast linear kinetic inductive photoresponse of YBa2Cu3O7−δ meander-line structures by photoimpedance measurements

Atikian

Ghamsari

Anlage

et al. 2011

Applied Physics Letters

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We report the experimental demonstration of the linear kinetic-inductive photoresponse of thin-film YBa 2 Cu 3 O 7−δ (YBCO) meander-line structures, where the photoresponse amplitude, full-width-halfmaximum (FWHM), and rise-time are bilinear in the incident optical power and bias current. This bilinear behavior reveals a trade-off between obtaining high responsivity and high speed photodetection. We also report a rise-time as short as 29ps in our photoimpedance measurements.The interaction of light with superconducting samples is long known to perturb superconductivity 1-4 , which can be used as a probing mechanism for optoelectronic applications 5-13 . In general, photons of energy greater than the Cooper pair binding energy (2∆) can initiate a chain of pair-breaking events resulting in a deviation of the quasiparticle and pair densities from their equilibrium values. Typically, these distributions depend on temperature, optical power and wavelength, thermal boundary conditions, and material properties such as electron-electron and electron-phonon interactions times, electron density, coherence length, penetration depth, and geometry 6,14 . While determining the spatial and temporal distribution of quasiparticles and pairs under a time-varying optical illumination is a profound problem in non-equilibrium superconductivity, many of the important concepts of such an interaction for device applications can be captured by means of a much simpler and more phenomenological approach, namely the kinetic inductance model 13 . Within the kinetic inductance model the presence of the superconductive condensate, at a macroscopic level, can be adequately modeled by an additional inductive channel for charge transport. The optically initiated pair breaking mechanism, within this framework, should be interpreted as the spatial and temporal variations of the kinetic inductance and the normal resistance of the superconducting specimen.Many researchers have experimentally studied the kinetic inductive photoresponse of superconducting thin films through photoimpedance measurements 6,15 . In photoimpedance measurements, light induced changes in the microwave impedance of the superconducting structure are measured by an external high-frequency circuit. In its simplest form, the specimen is externally biased with a dc current and connected to a fast oscilloscope in series with a high bandwidth amplifier; absorption of optical photons then changes the impedance of the sample and produces a transient voltage response. A number a) Author to whom correspondence should be addressed. Electronic address: haatikia@maxwell.uwaterloo.ca of previous works have reported photoimpedance measurements on different superconductors mainly concluding that: 1) the resistive photoresponse dominates at temperatures well below the critical temperature (T c ), whereas the kinetic inductive response becomes the main mechanism of photoresponse close to T c ; 2) In the kinetic inductive regime the photoresponse could be very fast, with a rise time as low as 50...

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supporting

confidence: 79%

mentioning

confidence: 99%

Ultrafast linear kinetic inductive photoresponse of YBa2Cu3O7−δ meander-line structures by photoimpedance measurements

Atikian

Ghamsari

Anlage

et al. 2011

Applied Physics Letters

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“…All measurements were performed at bias currents Ib which correspond to the level of a dark counts ~10 cps (Ib~0.8-0.9 Ic). Also the power of the laser source corresponds to a count of ~10 6 Hz. The rise time rise(Lk) was determined from the dependence U(t) in Fig.…”

Section: Federation 5 National Research University Higher School Of Ementioning

confidence: 99%

Rise time of voltage pulses in NbN superconducting single photon detectors

Smirnov

Divochiy²,

Vakhtomin

et al. 2016

Applied Physics Letters

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We have found experimentally that the rise times of voltage pulses in NbN superconducting single photon detectors increase nonlinearly with increasing detector length. We fabricated superconducting single photon detectors based on NbN thin films with a meander-like sensitive region of area from 2x2 µm 2 to 11x11 µm 2 . The effect is connected with the dependence of the detector resistance, which appears after photon absorption, on its kinetic inductance and hence on detector length. This conclusion is confirmed by our calculations in the framework of the two-temperature model. _____________________________ a) Author to whom correspondence should be addressed. Electronic mail: morozov@scontel.ru

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“…The critical current density of the mixer amounts to 4.5 · 10 6 A/cm 2 , and the normal resistance lies in a range of 70 to 80 Ω. The conversion band is measured near the temperature of the superconducting transition since in this case, the model of uniform electron heating is valid and the heat-balance equations describing a superconducting film become linear and yield an analytical solution that can unambiguously be interpreted [8] and describes well the frequency dependence of the conversion efficiency.…”

Section: Technological Route Direct-current Characteristics Of Mixersmentioning

confidence: 99%

Low-noise wide-band hot-electron bolometer mixer based on an NbN film

Ryabchun

Tretyakov

Pentin

et al. 2009

Radiophys Quantum El

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UDC 520.27We develop and study a hot-electron bolometer mixer made of a two-layer NbN-Au film in situ deposited on a silicon substrate. The double-sideband noise temperature of the mixer is 750 K at a frequency of 2.5 THz. The conversion efficiency measurements show that at the superconducting transition temperature, the intermediate-frequency bandwidth amounts to about 6.5 GHz for a mixer 0.112 µm long. These record-breaking characteristics are attributed to the improved contacts between a sensitive element and a helical antenna and are reached due to using the in situ deposition of NbN and Au layers at certain stages of the process.

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Response of superconducting films to a periodic optical irradiation

Cited by 73 publications

References 31 publications

Ultrafast linear kinetic inductive photoresponse of YBa2Cu3O7−δ meander-line structures by photoimpedance measurements

Ultrafast linear kinetic inductive photoresponse of YBa2Cu3O7−δ meander-line structures by photoimpedance measurements

Rise time of voltage pulses in NbN superconducting single photon detectors

Low-noise wide-band hot-electron bolometer mixer based on an NbN film

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