Ultrafast superconducting single-photon detector with a reduced active area coupled to a tapered lensed single-mode fiber

Sidorova, M.; Divochiy, A.; Vakhtomin, Yury; Smirnov, K.

doi:10.1117/1.jnp.9.093051

Cited by 10 publications

(8 citation statements)

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“…In order to measure the quantum efficiency, the detectors were installed in a special holder. The installation technique of the detector and its coupling with a single-mode optical fiber were described earlier [12]. The calculated optical coupling between the detector active area and the radiation propagating in the fiber core is more than 99 % at wavelength 1310 nm taking into account the data for the mode field diameter, the Gaussian distribution in single-mode fiber, and possible misalignment of 1 µm.…”

Section: Resultsmentioning

confidence: 99%

“…Over recent years, superconducting single-photon detectors (SSPD) have demonstrated continuous improvement of the key characteristics such as quantum efficiency [1][2][3][4][5], dark counts rate [6][7][8], jitter [9,10], dead time [11][12][13] and noiseequivalent power [14]. Also SSPD has found numerous applications in various fields [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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NbN single-photon detectors with saturated dependence of quantum efficiency

Smirnov

Divochiy²,

Vakhtomin

et al. 2018

Supercond. Sci. Technol.

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It was investigated the possibility of creating NbN superconducting single-photon detectors with saturated dependence of quantum efficiency versus normalized bias current. It was shown that the saturation increases for the detectors based on finer films with a lower value of R s300 /R s20 . The decreasing of R s300 /R s20 related to increasing influence of quantum corrections to conductivity of superconductors and, in its turn, to decreasing electron diffusion coefficient. The best samples has constant value of system quantum efficiency 94% at I b /I c~0 .8 and wavelength 1310 nm.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

NbN single-photon detectors with saturated dependence of quantum efficiency

Smirnov

Divochiy²,

Vakhtomin

et al. 2018

Supercond. Sci. Technol.

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“…The improvement in dynamic range comes from the much lower dead time along with an extremely low dark count rate. In addition, SSPDs offer cutting-edge timing resolution, which is comparable to or slightly better than the resolution of the best available avalanche photodetectors (APD) [36].…”

Section: Introductionmentioning

confidence: 99%

Polarization-Controlled Tunable Directional Coupling of Surface Plasmon Polaritons

Lin

Mueller

Wang

et al. 2013

Science

1,089

941

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Light can be coupled into propagating electromagnetic surface waves at a metal-dielectric interface known as surface plasmon polaritons (SPPs). This process has traditionally faced challenges in the polarization sensitivity of the coupling efficiency and in controlling the directionality of the SPPs. We designed and demonstrated plasmonic couplers that overcome these limits using polarization-sensitive apertures in a gold film. Our devices enable polarization-controlled tunable directional coupling with polarization-invariant total conversion efficiency and preserve the incident polarization information. Both bidirectional and unidirectional launching of SPPs are demonstrated. The design is further applied to circular structures that create radially convergent and divergent SPPs, illustrating that this concept can be extended to a broad range of applications.

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“…It was found that the intrinsic jitter increases in nanowires with smaller thickness and larger kinetic inductance per unit length [3]. Furthermore, the jitter increases with the size of the detector [4,5] and is less for the central part of the detector area as compared to peripherals [6]. Although low jitter itself is a challenge, it becomes attractive only in conjunction with the practical values of the detection efficiency and maximum count rate.…”

Section: Introductionmentioning

confidence: 99%

Physical mechanisms of timing jitter in photon detection by current-carrying superconducting nanowires

Sidorova¹,

Semenov²,

Hübers³

et al. 2017

Phys. Rev. B

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We studied timing jitter in the appearance of photon counts in meandering nanowires with different fractional amount of bends. Timing jitter, which is the probability density of the random time delay between photon absorption in current-carrying superconducting nanowire and appearance of the normal domain, reveals two different underlying physical scenarios. In the deterministic regime, which is realized at large currents and photon energies, jitter is controlled by position dependent detection threshold in straight parts of meanders and decreases with the current. At small photon energies, jitter increases and its current dependence disappears. In this probabilistic regime jitter is controlled by Poisson process in that magnetic vortices jump randomly across the wire in areas adjacent to the bends.

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Ultrafast superconducting single-photon detector with a reduced active area coupled to a tapered lensed single-mode fiber

Cited by 10 publications

References 0 publications

NbN single-photon detectors with saturated dependence of quantum efficiency

NbN single-photon detectors with saturated dependence of quantum efficiency

Polarization-Controlled Tunable Directional Coupling of Surface Plasmon Polaritons

Physical mechanisms of timing jitter in photon detection by current-carrying superconducting nanowires

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