Bibliography database of Radiophysics Laboratory (RpLab) -- Query Results

<< 1 2 3 4 >>

Details

Records
Author	Boreman, Glenn D.
Title	Infrared microantennas			Type	Journal Article
Year	1997	Publication	SPIE	Abbreviated Journal	SPIE
Volume	3110	Issue		Pages	882-885
Keywords	optical antennas
Abstract	We present results of mesurments of the polarization response of asymetric spiral antennas coupled Ni-NiO-Ni diodes, over the wavelength range 10.2 to 10.7 μm. The feed structure of the antenna imposes an elliptical polarization singature that is different from the circular polarization expected from a symmetric spiral. We develop a lossy-transmission-line model yielding the measured polarization response. A combination of a balanced and an unbalanced mode is required. Reflected current waves from the arm ends are significant.
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
Notes				Approved	no
Call Number	RPLAB @ gujma @			Serial	755
Permanent link to this record



Author	Hubers, H.-W.; Semenov, A.; Richter, H.; Schwarz, M.; Gunther, B.; Smirnov, K.; Gol’tsman, G.; Voronov, B.
Title	Heterodyne receiver for 3-5 THz with hot-electron bolometer mixer			Type	Conference Article
Year	2004	Publication	Proc. SPIE	Abbreviated Journal	Proc. SPIE
Volume	5498	Issue		Pages	579-586
Keywords	NbN HEB mixers
Abstract	Heterodyne receivers for applications in astronomy and planetary research need quantum limited sensitivity. In instruments which are currently build for SOFIA and Herschel superconducting hot electron bolometers (HEB) will be used to achieve this goal at frequencies above 1.4 THz. The local oscillator and the mixer are the most critical components for a heterodyne receiver operating at 3-5 THz. The design and performance of an optically pumped THz gas laser optimized for this frequency band will be presented. In order to optimize the performance for this frequency hot electron bolometer mixers with different in-plane dimensions and logarithmic-spiral feed antennas have been investigated. Their noise temperatures and beam patterns were measured. Above 3 THz the best performance was achieved with a superconducting bridge of 2.0 x 0.2 Î¼m² incorporated in a logarithmic spiral antenna. The DSB noise temperatures were 2700 K, 4700 K and 6400 K at 3.1 THz, 4.3 THz and 5.2 THz, respectively. The results demonstrate that the NbN HEB is very well suited as a mixer for THz heterodyne receivers up to at least 5 THz.
Address
Corporate Author				Thesis
Publisher	SPIE	Place of Publication		Editor	Zmuidzinas, J.; Holland, W.S.; Withington, S.
Language		Summary Language		Original Title
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN		ISBN		Medium
Area		Expedition		Conference	Millimeter and Submillimeter Detectors for Astronomy II
Notes				Approved	no
Call Number				Serial	1483
Permanent link to this record



Author	Baubert, J.; Salez, M.; Delorme, Y.; Pons, P.; Goltsman, G.; Merkel, H.; Leconte, B.
Title	Membrane-based HEB mixer for THz applications			Type	Conference Article
Year	2003	Publication	Proc. SPIE	Abbreviated Journal	Proc. SPIE
Volume	5116	Issue		Pages	551-562
Keywords	membrane NbN HEB mixers, heterodyne receiver, stress-less membrane, coupling efficiency, submillimeter-waves frequency, low-cost space applications
Abstract	We report in this paper a new concept for 2.7 THz superconducting Niobium nitride (NbN) Hot-Electron Bolometer mixer (HEB). The membrane process was developped for space telecommnunication applications a few years ago and the HEB mixer concept is now considered as the best choice for low-noise submillimeter-wave frequency heterodyne receivers. The idea is then to join these two technologies. The novel fabrication scheme is to fabricate a NbN HEB mixer on a 1 μm thick stress-less Si₃N₄/SiO₂ membrane. This seems to present numerous improvements concerning : use at higher RF frequencies, power coupling efficiency, HEB mixer sensitivity, noise temperature, and space applications. This work is to be continued within the framework of an ESA TRP project, a 2.7 THz heterodyne camera with numerous applications including a SOFIA airborne receiver. This paper presents the whole fabrication process, the validation tests and preliminary results. Membrane-based HEB mixer theory is currently being investigated and further tests such as heterodyne and Fourier transform spectrometry measurement are planed shortly.
Address
Corporate Author				Thesis
Publisher	SPIE	Place of Publication		Editor	Chiao, J.-C.; Varadan, V.K.; Cané, C.
Language		Summary Language		Original Title
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN		ISBN		Medium
Area		Expedition		Conference	Smart Sensors, Actuators, and MEMS
Notes				Approved	no
Call Number				Serial	1520
Permanent link to this record



Author	Goltsman, G.; Korneev, A.; Minaeva, O.; Rubtsova, I.; Chulkova, G.; Milostnaya, I.; Smirnov, K.; Voronov, B.; Lipatov, A. P.; Pearlman, A. J.; Cross, A.; Slysz, W.; Verevkin, A. A.; Sobolewski, R.
Title	Advanced nanostructured optical NbN single-photon detector operated at 2.0 K			Type	Conference Article
Year	2005	Publication	Proc. SPIE	Abbreviated Journal	Proc. SPIE
Volume	5732	Issue		Pages	520-529
Keywords	NbN SSPD, SNSPD
Abstract	We present our studies on quantum efficiency (QE), dark counts, and noise equivalent power (NEP) of the latest generation of nanostructured NbN superconducting single-photon detectors (SSPDs) operated at 2.0 K. Our SSPDs are based on 4 nm-thick NbN films, patterned by electron beam lithography as highly-uniform 100÷120-nm-wide meander-shaped stripes, covering the total area of 10x10 μm² with the meander filling factor of 0.7. Advances in the fabrication process and low-temperature operation lead to QE as high as 30-40% for visible-light photons (0.56 μm wavelength)-the saturation value, limited by optical absorption of the NbN film. For 1.55 μm photons, QE was 20% and decreased exponentially with the wavelength reaching 0.02% at the 5-μm wavelength. Being operated at 2.0-K temperature the SSPDs revealed an exponential decrease of the dark count rate, what along with the high QE, resulted in the NEP as low as 5x10^-21 W/Hz^-1/2, the lowest value ever reported for near-infrared optical detectors. The SSPD counting rate was measured to be above 1 GHz with the pulse-to-pulse jitter below 20 ps. Our nanostructured NbN SSPDs operated at 2.0 K significantly outperform their semiconducting counterparts and find practical applications ranging from noninvasive testing of CMOS VLSI integrated circuits to ultrafast quantum communications and quantum cryptography.
Address
Corporate Author				Thesis
Publisher	Spie	Place of Publication		Editor	Razeghi, M.; Brown, G.J.
Language		Summary Language		Original Title
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN		ISBN		Medium
Area		Expedition		Conference	Quantum Sensing and Nanophotonic Devices II
Notes				Approved	no
Call Number				Serial	1478
Permanent link to this record



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
Permanent link to this record



Author	Huebers, H.-W.; Schubert, J.; Semenov, A.; Gol’tsman, G. N.; Voronov, B. M.; Gershenzon, E. M.; Schwaab, G. W.
Title	NbN phonon-cooled hot-electron bolometer as a mixer for THz heterodyne receivers			Type	Conference Article
Year	1999	Publication	Proc. SPIE	Abbreviated Journal	Proc. SPIE
Volume	3828	Issue		Pages	410-416
Keywords	NbN HEB mixers
Abstract	We have investigated a phonon-cooled NbN hot electron bolometric (HEB) mixer in the frequency range from 0.7 THz to 5.2 THz. The device was a 3.5 nm thin film with an in- plane dimension of 1.7 X 0.2 micrometers ² integrated in a complementary logarithmic spiral antenna. The measured DSB receiver noise temperatures are 1500 K, 2200 K, 2600 K, 2900 K, 4000 K, 5600 K and 8800 K. The sensitivity fluctuation, the long term stability, and the antenna pattern were measured and the suitability of the mixer for a practical heterodyne receiver is discussed.
Address
Corporate Author				Thesis
Publisher	Spie	Place of Publication		Editor	Chamberlain, J.M.
Language		Summary Language		Original Title
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN		ISBN		Medium
Area		Expedition		Conference	Terahertz Spectroscopy and Applications II
Notes				Approved	no
Call Number				Serial	1477
Permanent link to this record



Author	Huebers, H.-W.; Semenov, A.; Richter, H.; Birk, M.; Krocka, M.; Mair, U.; Smirnov, K.; Gol’tsman, G. N.; Voronov, B. M.
Title	Superconducting hot electron bolometer as mixer for far-infrared heterodyne receivers			Type	Conference Article
Year	2003	Publication	Proc. SPIE	Abbreviated Journal	Proc. SPIE
Volume	4855	Issue		Pages	395-401
Keywords	NbN HEB mixers
Abstract	Heterodyne receivers for applications in astronomy need quantum limited sensitivity. In instruments which are currently under development for SOFIA or Herschel superconducting hot electron bolometers (HEB) will be used to achieve this goal at frequencies above 1.4 THz. We present results of the development of a phonon-cooled NbN HEB mixer for GREAT, the German Receiver for Astronomy at Terahertz Frequencies, which will be flown aboard SOFIA. The mixer is a small superconducting bridge incorporated in a planar feed antenna and a hyperhemispherical lens. Mixers with logarithmic-spiral and double-slot feed antennas have been investigated with respect to their noise temperature, conversion loss, linearity and beam pattern. At 2.5 THz a double sideband noise temperature of 2200 K was achieved. The conversion loss was 17 dB. The response of the mixer was linear up to 400 K load temperature. The performance was verified by measuring an emission line of methanol at 2.5 THz. The measured linewidth is in good agreement with the linewidth deduced from pressure broadening measurements at millimeter wavelength. The results demonstrate that the NbN HEB is very well suited as a mixer for far-infrared heterodyne receivers.
Address
Corporate Author				Thesis
Publisher	SPIE	Place of Publication	Tucson, USA	Editor	Phillips, T. G.; Zmuidzinas, J.
Language		Summary Language		Original Title
Series Editor		Series Title	Presented at the Society of Photo-Optical Instrumentation Engineers (SPIE) Conference	Abbreviated Series Title
Series Volume	4855	Series Issue		Edition
ISSN		ISBN		Medium
Area		Expedition		Conference	Millimeter and Submillimeter Detectors for Astronomy
Notes				Approved	no
Call Number				Serial	335
Permanent link to this record



Author	Cherednichenko, S.; Khosropanah, P.; Adam, A.; Merkel, H. F.; Kollberg, E. L.; Loudkov, D.; Gol'tsman, G. N.; Voronov, B. M.; Richter, H.; Huebers, H.-W.
Title	1.4- to 1.7-THz NbN hot-electron bolometer mixer for the Herschel space observatory			Type	Conference Article
Year	2003	Publication	Proc. SPIE	Abbreviated Journal	Proc. SPIE
Volume	4855	Issue		Pages	361-370
Keywords	NbN HEB mixers
Abstract	NbN hot- electron bolometer mixers have reached the level of 10hv/k in terms of the input noise temperature with the noise bandwidth of 4-6 GHz from subMM band up to 2.5 THz. In this paper we discuss the major characteristics of this kind of receiver, i.e. the gain and the noise bandwidth, the noise temperature in a wide RF band, bias regimes and optimisation of RF coupling to the quasioptical mixer. We present the status of the development of the mixer for Band 6 Low for Herschel Telescope.
Address
Corporate Author				Thesis
Publisher	SPIE	Place of Publication		Editor	Phillips, T.G.; Zmuidzinas, J.
Language		Summary Language		Original Title
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN		ISBN		Medium
Area		Expedition		Conference	Millimeter and Submillimeter Detectors for Astronomy
Notes				Approved	no
Call Number				Serial	1521
Permanent link to this record



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
Permanent link to this record



Author	Hoogeveen, R. W. M.; Yagoubov, P. A.; Maurellis, A.; Koshelets, V. P.; Shitov, S. V.; Mair, U.; Krocka, M.; Wagner, G.; Birk, M.; Huebers, H.-W.; Richter, H.; Semenov, A.; Gol’tsman, G. N.; Voronov, B. M.; Ellison, B.N.; Kerridge, B.J.; Matheson, D. N.; Alderman, B.; Harman, M.; Siddans, R.; Reburn, J.
Title	New cryogenic heterodyne techniques applied in TELIS: the balloonborne THz and submillimeter limb sounder for atmospheric research			Type	Conference Article
Year	2003	Publication	Proc. SPIE	Abbreviated Journal	Proc. SPIE
Volume	5152	Issue		Pages	347-355
Keywords	TELIS, limb sounder, heterodyne detection, terahertz, sub millimeter, cryogenic, limb sounding, balloon borne, atmospheric research
Abstract	We present a design concept for a new state-of-the-art balloon borne atmospheric monitor that will allow enhanced limb sounding of the Earth’s atmosphere within the submillimeter and far-infrared wavelength spectral range: TELIS, TErahertz and submm LImb Sounder. The instrument is being developed by a consortium of major European institutes that includes the Space Research Organization of the Netherlands (SRON), the Rutherford Appleton Laboratory (RAL) will utilize state-of-the-art superconducting heterodyne technology and is designed to be a compact, lightweight instrument cpaable of providing broad spectral coverage, high spectral resolution and long flight duration ( 24 hours duration during a single flight campaign). The combination of high sensitivity and extensive flight duration will allow evaluation of the diurnal variation of key atmospheric constitutenets sucyh as OH, HO2, ClO, BrO togehter will onger lived constituents such as O₃, HCL and N₂O. Furthermore, TELIS will share a common balloon platform to that of the MIPAS-B Fourier Transform Spectrometer, developed by the Institute of Meteorology and Climate research of the over an extended spectral range. The combination of the TELIS and MIPAS instruments will provide atmospheric scientists with a very powerful observational tool. TELIS will serve as a testbed for new cryogenic heterodyne detection techniques, and as such it will act as a prelude to future spaceborne instruments planned by the European Space Agency (ESA).
Address
Corporate Author				Thesis
Publisher	SPIE	Place of Publication		Editor	Strojnik, M.
Language		Summary Language		Original Title
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN		ISBN		Medium
Area		Expedition		Conference	Infrared Spaceborne Remote Sensing XI
Notes				Approved	no
Call Number				Serial	1508
Permanent link to this record



Author	Gershenzon, E. M.; Gol'tsman, G. N.
Title	Hot-electron superconducting mixers			Type	Conference Article
Year	1993	Publication	Proc. SPIE	Abbreviated Journal	Proc. SPIE
Volume	2104	Issue		Pages	329-330
Keywords
Abstract	The creation of low noise heterodyne receivers for frequencies above 1 THz is in the urgentneed for radio astronomy, laser spectroscopy, plasma diagnostic, etc. In this paper we discussthe nonlinear effect related to hot electrons in superconductors, and their potential use in lownoise submilimeter wave mixer. We also discuss results achieved so far as well as possible futuredevelopments.
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	1654
Permanent link to this record



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
Permanent link to this record



Author	Puscasu, Irina; Boreman, Glenn D.
Title	Theoretical and experimental analysis of transmission and enchanced absorption of frequency selective surfaces in the infrared			Type	Conference Article
Year	2001	Publication	Proc. SPIE	Abbreviated Journal	Proc. SPIE
Volume	4293	Issue		Pages	185-190
Keywords	optical antennas
Abstract	A comparative study between theory and experiment is presented for transmission through lossy frequency selective surfaces (FSSs) on silicon in the 2 – 15 micrometer range. Important parameters controlling the resonance shape and location are identified: dipole length, spacing, impedance, and dielectric surroundings. Their separate influence is exhibited. The primary resonance mechanism of FSSs is the resonance of the individual metallic patches. There is no discernable resonance arising from a feed-coupled configuration. The real part of the element's impedance controls the minimum value of transmission, while scarcely affecting its location. Varying the imaginary part shifts the location of resonance, while only slightly changing the minimum value of transmission. With such fine-tuning, it is possible to make a good fit between theory and experiment near the dipole resonance on any sample. A fixed choice of impedance can provide a reasonable fit to all samples fabricated under the same conditions. The dielectric surroundings change the resonance wavelength of the FSS compared to its value in air. The presence of FSS on the substrate increases the absorptivity/emissivity of the surface in a resonant way. Such enhancement is shown for dipole and cross arrays at several wavelengths.
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
Notes				Approved	no
Call Number	RPLAB @ gujma @			Serial	753
Permanent link to this record



Author	Danerud, M.; Winkler, D.; Zorin, M.; Trifonov, V.; Karasik, B.; Gershenzon, E. M.; Gol'tsman, G. N.; Lindgren, M.
Title	Picosecond detection of infrared radiation with YBa₂Cu₃O_7-δ thin films			Type	Conference Article
Year	1993	Publication	Proc. SPIE	Abbreviated Journal	Proc. SPIE
Volume	2104	Issue		Pages	183-184
Keywords	YBCO HTS HEB detectors
Abstract	Picosecond nonequilibrium and slow bolometric responses from a patterned high-Tc superconducting (HTS) film due toinfrared radiation were investigated using both modulation and pulse techniques. Measurements at A, = 0.85 [tm andA, = 10.6 lim have shown a similar behaviour of the response vs modulation frequency f. The responsivity of the HTS filmbased detector at f ..- 0.6-1 GHz is estimated to be 10-2 – 10-1 V/W.
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	https://inis.iaea.org/search/searchsinglerecord.aspx?recordsFor=SingleRecord&RN=25034664			Approved	no
Call Number	10.1117/12.2298489			Serial	1653
Permanent link to this record



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
Permanent link to this record