Dr. Andrii Klimov Profile

Dr. Andrii Klimov

at Institute of Microelectronics and Photonics

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Author

Publications (6)

Proceedings Article | 14 May 2019 Paper

Superconducting single-photon detectors as smart sensors

W. Słysz, M. Guziewicz, R. Kruszka, A. Klimov, M. Węgrzecki, J. Bar, A. Panas

Proceedings Volume 11054, 110540F (2019) https://doi.org/10.1117/12.2525536

KEYWORDS: Photons, Field effect transistors, Superconductors, Sensors, Cryogenics, Statistical analysis, Single photon detectors, Smart sensors, Quantum efficiency, Photodetectors

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Proceedings Article | 15 May 2017 Paper

Superconducting order parameter fluctuations in NbN/NiCu and NbTiN/NiCu bilayer nanostripes for photon detection

Bernd Aichner, Florian Jausner, Georg Zechner, Rita Mühlgassner, Wolfgang Lang, Andrii Klimov, Roman Puźniak, Wojciech Słysz, Marek Guziewicz, Renata Kruszka, Maciej Węgrzecki, Roman Sobolewski

Proceedings Volume 10229, 102290H (2017) https://doi.org/10.1117/12.2270877

KEYWORDS: Superconductors, Photodetectors, Thermodynamics, Magnetism, Electroluminescent displays, Ferromagnetics, Temperature metrology, Sputter deposition, Sapphire, Annealing

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Proceedings Article | 22 December 2016 Paper

Critical current and electric transport properties of superconducting epitaxial Nb(Ti)N submicron structures

A. Klimov, W. Słysz, M. Guziewicz, V. Kolkovsky, M. Węgrzecki, J. Bar, M. Marchewka, B. Seredyński

Proceedings Volume 10175, 101750R (2016) https://doi.org/10.1117/12.2258216

KEYWORDS: Superconductors, Bridges, Sensors, Temperature metrology, Single photon detectors, Quantum computing, Aluminum, Silicon carbide, Resistance, Polishing

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Proceedings Article | 22 December 2016 Paper

New silicon photodiodes for detection of the 1064nm wavelength radiation

Maciej Węgrzecki, Tadeusz Piotrowski, Zbigniew Puzewicz, Jan Bar, Ryszard Czarnota, Rafal Dobrowolski, Andrii Klimov, Jan Kulawik, Helena Kłos, Michał Marchewka, Marek Nieprzecki, Andrzej Panas, Bartłomiej Seredyński, Andrzej Sierakowski, Wojciech Słysz, Beata Synkiewicz, Dariusz Szmigiel, Michał Zaborowski

Proceedings Volume 10175, 101750Y (2016) https://doi.org/10.1117/12.2257557

KEYWORDS: Photodiodes, Silicon, Photomasks, Aluminum, Photons, Mirrors, Reflectivity, Image segmentation, Diffusion, Optical lithography

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Proceedings Article | 22 December 2016 Paper

16-element photodiode array for the angular microdeflection detector and for stabilization of a laser radiation direction

Maciej Węgrzecki, Tadeusz Piotrowski, Jan Bar, Rafał Dobrowolski, Andrii Klimov, Helena Klos, Michał Marchewka, Marek Nieprzecki, Andrzej Panas, Piotr Prokaryn, Bartłomiej Seredyński, Andrzej Sierakowski, Wojciech Słysz, Dariusz Szmigiel, Michal Zaborowski

Proceedings Volume 10175, 101750Z (2016) https://doi.org/10.1117/12.2257558

KEYWORDS: Photodiodes, Laser stabilization, Sensors, Photovoltaics, Photomasks, Aluminum, Laser applications, Laser metrology, Laser development, Photography

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Proceedings Article | 6 May 2015 Paper

Superconducting and ferromagnetic properties of NbN/NiCu and NbTiN/NiCu bilayer nanostructures for photon detection

A. Klimov, R. Puźniak, B. Aichner, W. Lang, E. Joon, R. Stern, W. Słysz, M. Guziewicz, M. Juchniewicz, M. Borysiewicz, R. Kruszka, M. Węgrzecki, A. Łaszcz, A. Czerwinski, Roman Sobolewski

Proceedings Volume 9504, 950405 (2015) https://doi.org/10.1117/12.2179697

KEYWORDS: Magnetism, Superconductors, Temperature metrology, Nanostructures, Photonic nanostructures, Interfaces, Bridges, Nickel, Photodetectors, Ferromagnetics

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Performance of superconducting single-photon detectors based on resistive hotspot formation in nanostripes upon optical photon absorption depends strongly on the critical current density J_C of the fabricated nanostructure. Utilization of an ultrathin, weak-ferromagnet cap layer on the top of a superconducting film enhances of the structure’s J_C due to an extra flux pinning. We have fabricated a number of both NbN/NiCu and NbTiN/NiCu superconductor/ferromagnet (S/F) ultrathin bilayers and microbridges. NbN and NbTiN underlayers with thicknesses varying from 4 to 7 nm were grown using dc-magnetron sputtering on chemically cleaned sapphire single-crystal substrates. After rapid thermal annealing at high temperatures, the S films were coated with Ni_0.54Cu_0.46 overlayers with thicknesses of about 6 nm, using cosputtering. Compositions of the deposited films were confirmed by EDX spectroscopy analysis, while TEM studies demonstrated excellent epitaxial quality of our S layers with ~2-nm-thick F/S transition layer and atomically-sharp S/substrate interface. Magnetic properties of bilayers were studied using both the SQUID and Vibrating Sample Magnetometer techniques in low and high magnetic fields. Low-temperature tests confirmed that in all cases NiCu films were ferromagnetic with the Curie temperature of above 30 K. Below the bilayer critical temperature of approx. 12-13 K, the structures were fully proximitized with the strong superconducting signal. For superconducting transport properties characterization, we used bilayers patterned into 40-μm-long microbridges with the width varying from 0.4 μm to 2 μm. The same S/F nanostructures were also used to study their superconducting fluctuations. The temperature dependence of magnetoresistance demonstrated highly 2-dimensional character with an unusual negative region that extended almost to room temperature. In the S/F sample, the fluctuations were observed to be substantially below theoretical expectations.

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