Records |
Author |
Beebe, M. R.; Beringer, D. B.; Burton, M. C.; Yang, K.; Lukaszew, R. A. |
Title |
Stoichiometry and thickness dependence of superconducting properties of niobium nitride thin films |
Type |
Journal Article |
Year |
2016 |
Publication |
Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films |
Abbreviated Journal |
Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films |
Volume |
34 |
Issue |
2 |
Pages |
021510 (1 to 4) |
Keywords |
potential plagiarism, possible plagiarism, NbN films |
Abstract ![sorted by Abstract field, ascending order (up)](img/sort_asc.gif) |
The current technology used in linear particle accelerators is based on superconducting radio frequency (SRF) cavities fabricated from bulk niobium (Nb), which have smaller surface resistance and therefore dissipate less energy than traditional nonsuperconducting copper cavities. Using bulk Nb for the cavities has several advantages, which are discussed elsewhere; however, such SRF cavities have a material-dependent accelerating gradient limit. In order to overcome this fundamental limit, a multilayered coating has been proposed using layers of insulating and superconducting material applied to the interior surface of the cavity. The key to this multilayered model is to use superconducting thin films to exploit the potential field enhancement when these films are thinner than their London penetration depth. Such field enhancement has been demonstrated in MgB2 thin films; here, the authors consider films of another type-II superconductor, niobium nitride (NbN). The authors present their work correlating stoichiometry and superconducting properties in NbN thin films and discuss the thickness dependence of their superconducting properties, which is important for their potential use in the proposed multilayer structure. While there are some previous studies on the relationship between stoichiometry and critical temperature TC, the authors are the first to report on the correlation between stoichiometry and the lower critical field HC1. |
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ISSN |
0734-2101 |
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Notes |
Potential plagiarism for 1503 |
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no |
Call Number |
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Serial |
1504 |
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Author |
Prokhodtsov, A.; Golikov, A.; An, P.; Kovalyuk, V.; Goltsman, G.; Arakelyan, S.; Evlyukhin, A.; Kalachev, A.; Naumov, A. |
Title |
Effect of silicon oxide coating on a silicon nitride focusing grating coupler efficiency |
Type |
Conference Article |
Year |
2019 |
Publication |
EPJ Web Conf. |
Abbreviated Journal |
EPJ Web Conf. |
Volume |
220 |
Issue |
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Pages |
02009 |
Keywords |
grating coupler, SiO2 |
Abstract ![sorted by Abstract field, ascending order (up)](img/sort_asc.gif) |
The dependence of the efficiency of the focusing grating couplers on the period and filling factor before and after deposition of the upper silicon oxide layer was experimentally studied. The obtained data are of practical importance for tunable integrated-optical devices based on silicon nitride platform. |
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ISSN |
2100-014X |
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Serial |
1188 |
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Author |
Ozhegov, R. V.; Okunev, O. V.; Gol’tsman, G. N.; Filippenko, L. V.; Koshelets, V. P. |
Title |
Noise equivalent temperature difference of a superconducting integrated terahertz receiver |
Type |
Journal Article |
Year |
2009 |
Publication |
J. Commun. Technol. Electron. |
Abbreviated Journal |
J. Commun. Technol. Electron. |
Volume |
54 |
Issue |
6 |
Pages |
716-720 |
Keywords |
SIS mixer SIR NETD, FFO, harmonic mixer |
Abstract ![sorted by Abstract field, ascending order (up)](img/sort_asc.gif) |
The dependence of the noise equivalent temperature difference (NETD) of a superconducting integrated receiver (SIR) on the receiver noise temperature and the inputsignal level has been investigated. An unprecedented NETD of 13±2 mK has been measured at a SIR noise temperature of 200 K, intermediate-frequency bandwidth of 4 GHz, and time constant of 1 s. With a decrease in the input signal, an improvement in the NETD is observed. This effect is explained by a reduction in the influence of the instabilities of the receiver power supply and the amplification circuit that occur when the input signal is decreased. |
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ISSN |
1064-2269 |
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no |
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Serial |
1400 |
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Author |
Kahl, O.; Ferrari, S.; Kovalyuk, V.; Vetter, A.; Lewes-Malandrakis, G.; Nebel, C.; Korneev, A.; Goltsman, G.; Pernice, W. |
Title |
Spectrally multiplexed single-photon detection with hybrid superconducting nanophotonic circuits |
Type |
Journal Article |
Year |
2017 |
Publication |
Optica |
Abbreviated Journal |
Optica |
Volume |
4 |
Issue |
5 |
Pages |
557-562 |
Keywords |
Waveguide integrated superconducting single-photon detectors; Nanophotonics and photonic crystals; Quantum detectors; Spectrometers and spectroscopic instrumentation |
Abstract ![sorted by Abstract field, ascending order (up)](img/sort_asc.gif) |
The detection of individual photons by superconducting nanowire single-photon detectors is an inherently binary mechanism, revealing either their absence or presence while concealing their spectral information. For multicolor imaging techniques, such as single-photon spectroscopy, fluorescence resonance energy transfer microscopy, and fluorescence correlation spectroscopy, wavelength discrimination is essential and mandates spectral separation prior to detection. Here, we adopt an approach borrowed from quantum photonic integration to realize a compact and scalable waveguide-integrated single-photon spectrometer capable of parallel detection on multiple wavelength channels, with temporal resolution below 50 ps and dark count rates below 10 Hz at 80% of the devices' critical current. We demonstrate multidetector devices for telecommunication and visible wavelengths, and showcase their performance by imaging silicon vacancy color centers in diamond nanoclusters. The fully integrated hybrid superconducting nanophotonic circuits enable simultaneous spectroscopy and lifetime mapping for correlative imaging and provide the ingredients for quantum wavelength-division multiplexing on a chip. |
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Call Number |
RPLAB @ kovalyuk @ |
Serial |
1119 |
Permanent link to this record |
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Author |
Kahl, O.; Ferrari, S.; Kovalyuk, V.; Vetter, A.; Lewes-Malandrakis, G.; Nebel, C.; Korneev, A.; Goltsman, G.; Pernice, W. |
Title |
Spectrally resolved single-photon imaging with hybrid superconducting – nanophotonic circuits |
Type |
Miscellaneous |
Year |
2016 |
Publication |
arXiv |
Abbreviated Journal |
arXiv |
Volume |
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Issue |
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Pages |
1-20 |
Keywords |
waiveguide SSPD, SNSPD, imaging |
Abstract ![sorted by Abstract field, ascending order (up)](img/sort_asc.gif) |
The detection of individual photons is an inherently binary mechanism, revealing either their absence or presence while concealing their spectral information. For multi-color imaging techniques, such as single photon spectroscopy, fluorescence resonance energy transfer microscopy and fluorescence correlation spectroscopy, wavelength discrimination is essential and mandates spectral separation prior to detection. Here, we adopt an approach borrowed from quantum photonic integration to realize a compact and scalable waveguide-integrated single-photon spectrometer capable of parallel detection on multiple wavelength channels, with temporal resolution below 50 ps and dark count rates below 10 Hz. We demonstrate multi-detector devices for telecommunication and visible wavelengths and showcase their performance by imaging silicon vacancy color centers in diamond nanoclusters. The fully integrated hybrid superconducting-nanophotonic circuits enable simultaneous spectroscopy and lifetime mapping for correlative imaging and provide the ingredients for quantum wavelength division multiplexing on a chip. |
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Call Number |
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Serial |
1334 |
Permanent link to this record |