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	Author	Verevkin, A. A.; Zhang, J.; Slysz, W.; Sobolewski, R.; Lipatov, A. P.; Okunev, O.; Chulkova, G.; Korneev, A.; Gol’tsman, G. N.
	Title	Superconducting single-photon detectors for GHz-rate free-space quantum communications			Type	Conference Article
	Year	2002	Publication	Proc. SPIE	Abbreviated Journal	Proc. SPIE
	Volume	4821	Issue		Pages	447-454
	Keywords	NbN SSPD, SNSPD, single-photon detector, thin-film superconductivity, quantum cryptography, ultrafast communications
	Abstract	We report our studies on the performance of new NbN ultrathin-film superconducting single-photon detectors (SSPDs). Our SSPDs exhibit experimentally measured quantum efficiencies from 5% at wavelength λ = 1550 nm up to 10% at λ = 405 nm, with exponential, activation-energy-type spectral sensitivity dependence in the 0.4-μm – 3-μm wavelength range. Using a variable optical delay setup, we have shown that our NbN SSPDs can resolve optical photons with a counting rate up to 10 GHz, presently limited by the read-out electronics. The measured device jitter was below 35 ps under optimum biasing conditions. The extremely high photon counting rate, together with relatively high (especially for λ > 1 μm) quantum efficiency, low jitter, and very low dark counts, make NbN SSPDs very promising for free-space communications and quantum cryptography.
	Address
	Corporate Author				Thesis
	Publisher	SPIE	Place of Publication		Editor	Ricklin, J.C.; Voelz, D.G.
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN		ISBN		Medium
	Area		Expedition		Conference	Free-Space Laser Communication and Laser Imaging II
	Notes				Approved	no
	Call Number				Serial	1523
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	Author	Huebers, H.-W.; Semenov, A.; Schubert, J.; Gol’tsman, G. N.; Voronov, B. M.; Gershenzon, E. M.; Krabbe, A.; Roeser, H.-P.
	Title	NbN hot-electron bolometer as THz mixer for SOFIA			Type	Conference Article
	Year	2000	Publication	Proc. SPIE	Abbreviated Journal	Proc. SPIE
	Volume	4014	Issue		Pages	195-202
	Keywords	NbN HEB mixers, airborne, stratospheric observatory, SOFIA
	Abstract	Heterodyne receivers for applications in astronomy need quantum limited sensitivity. We have investigated phonon- cooled NbN hot electron bolometric mixers in the frequency range from 0.7 THz to 5.2 THz. The devices were 3.5 nm thin films with an in-plane dimension of 1.7 X 0.2 micrometers ² integrated in a complementary logarithmic spiral antenna. The best measured DSB receiver noise temperatures are 1300 K (0.7 THz), 2000 K (1.4 THz), 2100 K (1.6 THz), 2600 K (2.5 THz), 4000 K (3.1 THz), 5600 K (4.3 THz), and 8800 K (5.2 THz). The sensitivity fluctuation, the long term stability, and the antenna pattern were measured. The results demonstrate that this mixer is very well suited for GREAT, the German heterodyne receiver for SOFIA.
	Address
	Corporate Author				Thesis
	Publisher	SPIE	Place of Publication		Editor	Melugin, R.K.; Roeser, H.-P.
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN		ISBN		Medium
	Area		Expedition		Conference	Airborne Telescope Systems
	Notes				Approved	no
	Call Number				Serial	1554
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	Author	Yngvesson, K. S.; Gerecht, E.; Musante, C. F.; Zhuang, Y.; Ji, M.; Goyette, T. M.; Dickinson, J. C.; Waldman, J.; Yagoubov, P. A.; Gol’tsman, G. N.; Voronov, B. M.; Gershenzon, E. M.
	Title	Low-noise HEB heterodyne receivers and focal plane arrays for the THz regime using NbN			Type	Conference Article
	Year	1999	Publication	Proc. SPIE	Abbreviated Journal	Proc. SPIE
	Volume	3795	Issue		Pages	357-368
	Keywords	NbN HEB mixers
	Abstract	We have developed prototype HEB receivers using thin film superconducting NbN devices deposited on silicon substrates. The devices are quasi-optically coupled through a silicon lens and a self-complementary log-specific toothed antenna. We measured DSB receiver noise temperatures of 500 K (13 X hf/2k) at 1.56 THz and 1,100 K (20 X hf/2k) at 2.24 THz. Noise temperatures are expected to fall further as devices and quasi-optical coupling methods are being optimized. The measured 3 dB IF conversion gain bandwidth for one device was 3 GHz, and it is estimated that the bandwidth over which the receiver noise temperature is within 3 dB of its minimum value is 6.5 GHz which is sufficient for a number of practical applications. We will discuss our latest results and give a detailed description of our prototype setup and experiments. We will also discuss our plans for developing focal plane arrays with tens of Hot Electron Bolometric mixer elements on a single silicon substrate which will make real time imaging systems in the THz region feasible.
	Address
	Corporate Author				Thesis
	Publisher	SPIE	Place of Publication		Editor	Hwu, R.J.; Wu, K.
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN		ISBN		Medium
	Area		Expedition		Conference	Terahertz and Gigahertz Photonics
	Notes				Approved	no
	Call Number				Serial	1561
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	Author	Schwaab, G.W.; Auen, K.; Bruendermann, E.; Feinaeugle, R.; Gol’tsman, G.N.; Huebers, H.-W.; Krabbe, A.; Roeser, H.-P.; Sirmain, G.
	Title	2- to 6-THz heterodyne receiver array for the Stratospheric Observatory for Infrared Astronomy (SOFIA)			Type	Conference Article
	Year	1998	Publication	Proc. SPIE	Abbreviated Journal	Proc. SPIE
	Volume	3357	Issue		Pages	85-96
	Keywords	NbN HEB mixers, applications, stratospheric observatory, airborne
	Abstract	The Institute of Space Sensor Technology of the German Aerospace Center (DLR) is developing a heterodyne array receiver for the frequency range 2 to 6 THz for the Stratospheric Observatory for Infrared Astronomy (SOFIA). Key science issues in that frequency range are the observation of lines of atoms [e.g. (OI)], ions [e.g. (CII), (NII)], and molecules (e.g. OH, HD, CO) with high spectral resolution to study the dynamics and evolution of galactic and extragalactic objects. Long term goal is the development of an integrated array heterodyne receiver with superconducting hot electron bolometric (HEB) mixers and p-type Ge or Si lasers as local oscillators. The first generation receiver will be composed of HEB mixers in a 2 pixel 2 polarization array which will be pumped by a gas laser local oscillator. Improved Schottky diode mixers are the backup solution for the HEBs. The state of the art of HEB mixer and p-type Ge laser technology are described as well as possible improvements in the ’conventional’ optically pumped far-infrared laser and Schottky diode mixer technology. Finally, the frequency coverage of the first generation heterodyne receiver for some important astronomical transitions is discussed. The expected sensitivity is compared to line fluxes measured by the ISO satellite.
	Address
	Corporate Author				Thesis
	Publisher	SPIE	Place of Publication		Editor	Phillips, T.G.
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN		ISBN		Medium
	Area		Expedition		Conference	Advanced Technology MMW, Radio, and Terahertz Telescopes
	Notes				Approved	no
	Call Number				Serial	1583
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	Author	Gol’tsman, G. N.; Gershenzon, E. M.
	Title	High speed hot-electron superconducting bolometer			Type	Conference Article
	Year	1993	Publication	Proc. SPIE	Abbreviated Journal	Proc. SPIE
	Volume	2104	Issue		Pages	181-182
	Keywords	NbN HEb, Nb, Al
	Abstract	Physical limitation of response time of a superconducting bolometer as well as the nature of non-equilibrium detection of radiation have been investigated for Al, Nb and NbN thin films in spectral range from submillimeter to near-infraredwavelengths [1,2]. In the case of ideal heat removal from the film with the f_‘. 100A thickness the detection mechanism is an electron heating effect that is not selective to radiation wavelength in a very broad range. The response time ofan electron heating bolometer is determined by an electron-phonon interaction time. This time is of about 10 ns, 0.5 ns and 20 ps for Al, Nb, and NbN correspondingly near the critical temperature of the superconducting film. Thesensitive area of the bolometer consists of a number of narrow strips (with awidth of 1Ã‚Âµm) connected in parallel to contact pads; these pads together witha sapphire substrate and a ground plate represent the microstrip transmissionline with an impedance of 50 Q.
	Address
	Corporate Author				Thesis
	Publisher	SPIE	Place of Publication		Editor	Birch, J.R.; Parker, T.J.
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN		ISBN		Medium
	Area		Expedition		Conference	18th International Conference on Infrared and Millimeter Waves
	Notes				Approved	no
	Call Number				Serial	1652
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	Author	Zhang, J.; Verevkin, A.; Slysz, W.; Chulkova, G.; Korneev, A.; Lipatov, A.; Okunev, O.; Gol’tsman, G. N.; Sobolewski, Roman
	Title	Time-resolved characterization of NbN superconducting single-photon optical detectors			Type	Conference Article
	Year	2017	Publication	Proc. SPIE	Abbreviated Journal	Proc. SPIE
	Volume	10313	Issue		Pages	103130F (1 to 3)
	Keywords	NbN SSPD, SNSPD
	Abstract	NbN superconducting single-photon detectors (SSPDs) are very promising devices for their picosecond response time, high intrinsic quantum efficiency, and high signal-to-noise ratio within the radiation wavelength from ultraviolet to near infrared (0.4 gm to 3 gm) [1-3]. The single photon counting property of NbN SSPDs have been investigated thoroughly and a model of hotspot formation has been introduced to explain the physics of the photon- counting mechanism [4-6]. At high incident flux density (many-photon pulses), there are, of course, a large number of hotspots simultaneously formed in the superconducting stripe. If these hotspots overlap with each other across the width w of the stripe, a resistive barrier is formed instantly and a voltage signal can be generated. We assume here that the stripe thickness d is less than the electron diffusion length, so the hotspot region can be considered uniform. On the other hand, when the photon flux is so low that on average only one hotspot is formed across w at a given time, the formation of the resistive barrier will be realized only when the supercurrent at sidewalks surpasses the critical current (jr) of the superconducting stripe [1]. In the latter situation, the formation of the resistive barrier is associated with the phase-slip center (PSC) development. The effect of PSCs on the suppression of superconductivity in nanowires has been discussed very recently [8, 9] and is the subject of great interest.
	Address
	Corporate Author				Thesis
	Publisher	SPIE	Place of Publication		Editor	Armitage, J. C.
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN		ISBN		Medium
	Area		Expedition		Conference	Opto-Canada: SPIE Regional Meeting on Optoelectronics, Photonics, and Imaging, 2002, Ottawa, Ontario, Canada
	Notes	Downloaded from http://www2.ece.rochester.edu/projects/ufqp/PDF/2002/213NbNTimeOPTO_b.pdf This artcle was published in 2017 with only first author indicated (Zhang, J.). There were 8 more authors!			Approved	no
	Call Number				Serial	1750
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	Author	Schroeder, E.; Mauskopf, P.; Pilyavsky, G.; Sinclair, A.; Smith, N.; Bryan, S.; Mani, H.; Morozov, D.; Berggren, K.; Zhu, D.; Smirnov, K.; Vakhtomin, Y.
	Title	On the measurement of intensity correlations from laboratory and astronomical sources with SPADs and SNSPDs			Type	Conference Article
	Year	2016	Publication	Proc. SPIE	Abbreviated Journal	Proc. SPIE
	Volume	9907	Issue		Pages	99070P (1 to 13)
	Keywords	SPAD, NbN SSPD applications, SNSPD
	Abstract	We describe the performance of detector modules containing silicon single photon avalanche photodiodes (SPADs) and superconducting nanowire single photon detectors (SNSPDs) to be used for intensity interferometry. The SPADs are mounted in fiber-coupled and free-space coupled packages. The SNSPDs are mounted in a small liquid helium cryostat coupled to single mode fiber optic cables which pass through a hermetic feed-through. The detectors are read out with microwave amplifiers and FPGA-based coincidence electronics. We present progress on measurements of intensity correlations from incoherent sources including gas-discharge lamps and stars with these detectors. From the measured laboratory performance of the correlation system, we estimate the sensitivity to intensity correlations from stars using commercial telescopes and larger existing research telescopes.
	Address
	Corporate Author				Thesis
	Publisher	SPIE	Place of Publication		Editor	Malbet, F.; Creech-Eakman, M.J.; Tuthill, P.G.
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN		ISBN		Medium
	Area		Expedition		Conference	Optical and Infrared Interferometry and Imaging V
	Notes				Approved	no
	Call Number				Serial	1809
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	Author	Korneev, A. A.
	Title	Superconducting NbN microstrip single-photon detectors			Type	Abstract
	Year	2021	Publication	Proc. Quantum Optics and Photon Counting	Abbreviated Journal	Proc. Quantum Optics and Photon Counting
	Volume	11771	Issue		Pages
	Keywords	NbN SSPD, SNSPD
	Abstract	Superconducting Single-Photon Detectors (SSPD) invented two decades ago have evolved to a mature technology and have become devices of choice in the advanced applications of quantum optics, such as quantum cryptography and optical quantum computing. In these applications SSPDs are coupled to single-mode fibers and feature almost unity detection efficiency, negligible dark counts, picosecond timing jitter and MHz photon count rate. Meanwhile, there are great many applications requiring coupling to multi-mode fibers or free space. ‘Classical’ SSPDs with 100-nm-wide superconducting strip and covering area of about 100 µm2 are not suitable for further scaling due to degradation of performance and low fabrication yield. Recently we have demonstrated single-photon counting in micron-wide superconducting bridges and strips. Here we present our approach to the realization of practical photon-counting detectors of large enough area to be efficiently coupled to multi-mode fibers or free space. The detector is either a meander or a spiral of 1-µm-wide strip covering an area of 50x50 µm2. Being operated at 1.7K temperature it demonstrates the saturated detection efficiency (i.e. limited by the absorption in the detector) up to 1550 nm wavelength, about 10 ns dead time and timing jitter in range 50-100 ps.
	Address
	Corporate Author				Thesis
	Publisher	SPIE	Place of Publication		Editor	Prochazka, I.; Štefaňák, M.; Sobolewski, R.; Gábris, A.
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN		ISBN		Medium
	Area		Expedition		Conference	Quantum Optics and Photon Counting; SPIE Optics + Optoelectronics, 2021, Online Only
	Notes				Approved	no
	Call Number				Serial	1784
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	Author	Jiang, L.; Zhang, W.; Yao, Q. J.; Lin, Z. H.; Li, J.; Shi, S. C.; Svechnikov, S. I.; Vachtomin, Y. B.; Antipov, S. V.; Voronov, B. M.; Kaurova, N. S.; Gol'tsman, G. N.
	Title	Characterization of a quasi-optical NbN superconducting hot-electron bolometer mixer			Type	Conference Article
	Year	2005	Publication	Proc. PIERS	Abbreviated Journal	Proc. PIERS
	Volume	1	Issue	5	Pages	587-590
	Keywords	NbN HEB mixers
	Abstract	In this paper, we report the performance of a quasi-optical NbN superconducting HEB (hot electron bolome-ter) mixer measured at 500 GHz. The quasi-optical NbN superconducting HEB mixer is cryogenically cooled bya 4-K close-cycled refrigerator. Its receiver noise temperature and conversion gain are thoroughly investigatedfor different LO pumping levels and dc biases. The lowest receiver noise temperature is found to be approxi-mately 1200 K, and reduced to about 445 K after correcting theloss of the measurement system. The stabilityof the mixer’s IF output power is also demonstrated.
	Address	Hangzhou, China
	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	1931-7360	ISBN		Medium
	Area		Expedition		Conference	Progress In Electromagnetics Research Symposium
	Notes				Approved	no
	Call Number				Serial	1482
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	Author	Gol'tsman, G.; Maslennikov, S.; Finkel, M.; Antipov, S.; Kaurova, N.; Grishina, E.; Polyakov, S.; Vachtomin, Y.; Svechnikov, S.; Smirnov, K.; Voronov, B.
	Title	Nanostructured ultrathin NbN film as a terahertz hot-electron bolometer mixer			Type	Conference Article
	Year	2006	Publication	Proc. MRS	Abbreviated Journal	Proc. MRS
	Volume	935	Issue		Pages	210 (1 to 6)
	Keywords	NbN HEB mixers
	Abstract	Planar spiral antenna coupled and directly lens coupled NbN HEB mixer structures are studied. An additional MgO buffer layer between the superconducting film and Si substrate is introduced. The buffer layer enables us to increase the gain bandwidth of a HEB mixer due to better acoustic transparency. The gain bandwidth is widened as NbN film thickness decreases and amounts to 5.2 GHz. The noise temperature of antenna coupled mixer is 1300 and 3100 K at 2.5 and 3.8 THz respectively. The structure and composition of NbN films is investigated by X-ray diffraction spectroscopy methods. Noise performance degradation at LO frequencies more than 3 THz is due to the use of a planar antenna and signal loss in contacts between the antenna and the sensitive NbN bridge. The mixer is reconfigured for operation at higher frequencies in a manner that receiver’s noise temperature is only 2300 K (3 times of quantum limit) at LO frequency of 30 THz.
	Address
	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	0272-9172	ISBN		Medium
	Area		Expedition		Conference
	Notes				Approved	no
	Call Number				Serial	1440
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	Author	Ryabchun, S.; Smirnov, A.; Pentin, I.; Vakhtomin, Yu.; Smirnov, K.; Kaurova, N.; Voronov, B.; Goltsman, G.
	Title	Superconducting single photon detector integrated with optical cavity			Type	Conference Article
	Year	2011	Publication	Proc. MLPLIT	Abbreviated Journal	Proc. MLPLIT
	Volume		Issue		Pages	143-145
	Keywords	NbN SSPD, cavity
	Abstract
	Address	Suzdal / Vladimir (Russia)
	Corporate Author				Thesis
	Publisher	Modern laser physics and laser-information technologies for science and manufacture	Place of Publication		Editor
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN		ISBN		Medium
	Area		Expedition		Conference	1st international russian-chinese conference / youthschool-workshop
	Notes	September 23-28, 2011			Approved	no
	Call Number				Serial	1385
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	Author	Maslennikova, A.; Larionov, P.; Ryabchun, S.; Smirnov, A.; Pentin, I.; Vakhtomin, Yu.; Smirnov, K.; Kaurova, N.; Voronov, B.; Goltsman, G.
	Title	Noise equivalent power and dynamic range of NBN hot-electron bolometers			Type	Conference Article
	Year	2011	Publication	Proc. MLPLIT	Abbreviated Journal	Proc. MLPLIT
	Volume		Issue		Pages	146-148
	Keywords	NbN HEB
	Abstract
	Address	Suzdal / Vladimir (Russia)
	Corporate Author				Thesis
	Publisher	Modern laser physics and laser-information technologies for science and manufacture	Place of Publication		Editor
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN		ISBN		Medium
	Area		Expedition		Conference	1st international russian-chinese conference / youthschool-workshop
	Notes	September 23-28, 2011			Approved	no
	Call Number				Serial	1386
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	Author	Semenov, A. D.; Hübers, H.-W.; Gol’tsman, G. N.; Smirnov, K.
	Title	Superconducting quantum detector for astronomy and X-ray spectroscopy			Type	Conference Article
	Year	2002	Publication	Proc. Int. Workshop on Supercond. Nano-Electronics Devices	Abbreviated Journal	Proc. Int. Workshop on Supercond. Nano-Electronics Devices
	Volume		Issue		Pages	201-210
	Keywords	NbN SSPD, SNSPD, SQD, superconducting quantum detectors, X-ray spectroscopy
	Abstract	We propose the novel concept of ultra-sensitive energy-dispersive superconducting quantum detectors prospective for applications in astronomy and X-ray spectroscopy. Depending on the superconducting material and operation conditions, such detector may allow realizing background limited noise equivalent power 10−21 W Hz−1/2 in the terahertz range when exposed to 4-K background radiation or counting of 6-keV photon with almost 10—4 energy resolution. Planar layout and relatively simple technology favor integration of elementary detectors into a detector array.
	Address	Naples, Italy
	Corporate Author				Thesis
	Publisher	Springer	Place of Publication	Boston, MA	Editor	Pekola, J.; Ruggiero, B.; Silvestrini, P.
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN		ISBN	978-1-4615-0737-6	Medium
	Area		Expedition		Conference	International Workshop on Superconducting Nano-Electronics Devices, May 28-June 1, 2001
	Notes				Approved	no
	Call Number	semenov2002superconducting			Serial	1525
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	Author	Gao, J. R.; Hajenius, M.; Baselmans, J. J. A.; Klapwijk, T. M.; de Korte, P. A. J.; Voronov, B.; Gol'tsman, G.
	Title	NbN hot electron bolometer mixers with superior performance for space applications			Type	Conference Article
	Year	2004	Publication	Proc. Int. workshop on low temp. electronics	Abbreviated Journal	Proc. Int. workshop on low temp. electronics
	Volume		Issue		Pages	11-17
	Keywords	NbN HEB mixers, applications
	Abstract
	Address
	Corporate Author				Thesis
	Publisher		Place of Publication	Noordwijk	Editor	Armandillo, E.; Leone, B.
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN		ISBN		Medium
	Area		Expedition		Conference	International workshop on low temperature electronics- WOLTE 6 - Noordwijk
	Notes				Approved	no
	Call Number				Serial	1496
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	Author	Kuznetsov, K. A.; Kornienko, V. V.; Vakhtomin, Y. B.; Pentin, I. V.; Smirnov, K. V.; Kitaeva, G. K.
	Title	Generation and detection of optical-terahertz biphotons via spontaneous parametric downconversion			Type	Conference Article
	Year	2018	Publication	Proc. ICLO	Abbreviated Journal	Proc. ICLO
	Volume		Issue		Pages	303
	Keywords	NbN HEB applications
	Abstract	We study spontaneous parametric downconversion (SPDC) in the strongly non-degenerate regime when the idler wave hits the terahertz range. By using the hot-electron bolometer, for the first time the SPDC-generated idler-wave photons were directly detected in the terahertz frequency range. Spectrum of corresponding signal photons was measured using standard technique by the CCD camera. Possible applications of correlated optical-terahertz biphotons are discussed.
	Address
	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN		ISBN		Medium
	Area		Expedition		Conference	International Conference Laser Optics
	Notes				Approved	no
	Call Number				Serial	1806
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