| Records |
| Author |
Kostiuk, Theodor |
| Title |
Heterodyne spectroscopy in the thermal infrared region: a window on physics and chemistry |
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Conference Article |
| Year |
2003 |
Publication |
Proc. International Thermal Detectors Workshop (TDW'03), session 7 (Heterodyne detectors) |
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HgCdTe detector |
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3501 University Boulevar East Adelphi, MD 20783 |
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University of Maryland Inn and Conference Center |
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372 |
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| Author |
Snyder Hale, David D. |
| Title |
A thermal infrared heterodyne receiver with applications to astronomy |
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2003 |
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Berkeley, CA 94720 |
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373 |
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Sobolewski, R.; Verevkin, A.; Gol'tsman, G.N.; Lipatov, A.; Wilsher, K. |
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Ultrafast superconducting single-photon optical detectors and their applications |
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Journal Article |
| Year |
2003 |
Publication |
IEEE Trans. Appl. Supercond. |
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| Volume |
13 |
Issue |
2 |
Pages |
1151-1157 |
| Keywords |
NbN SSPD, SNSPD |
| Abstract |
We present a new class of ultrafast single-photon detectors for counting both visible and infrared photons. The detection mechanism is based on photon-induced hotspot formation, which forces the supercurrent redistribution and leads to the appearance of a transient resistive barrier across an ultrathin, submicrometer-width, superconducting stripe. The devices were fabricated from 3.5-nm- and 10-nm-thick NbN films, patterned into <200-nm-wide stripes in the 4 /spl times/ 4-/spl mu/m/sup 2/ or 10 /spl times/ 10-/spl mu/m/sup 2/ meander-type geometry, and operated at 4.2 K, well below the NbN critical temperature (T/sub c/=10-11 K). Continuous-wave and pulsed-laser optical sources in the 400-nm-to 3500-nm-wavelength range were used to determine the detector performance in the photon-counting mode. Experimental quantum efficiency was found to exponentially depend on the photon wavelength, and for our best, 3.5-nm-thick, 100-/spl mu/m/sup 2/-area devices varied from >10% for 405-nm radiation to 3.5% for 1550-nm photons. The detector response time and jitter were /spl sim/100 ps and 35 ps, respectively, and were acquisition system limited. The dark counts were below 0.01 per second at optimal biasing. In terms of the counting rate, jitter, and dark counts, the NbN single-photon detectors significantly outperform their semiconductor counterparts. Already-identified applications for our devices range from noncontact testing of semiconductor CMOS VLSI circuits to free-space quantum cryptography and communications. |
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1051-8223 |
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509 |
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| Author |
Stéphane Claude |
| Title |
Sideband-separating SIS mixer for ALMA band 7, 275–370 GHz |
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Conference Article |
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2003 |
Publication |
Proc. 14th Int. Symp. Space Terahertz Technol. |
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41 |
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Tucson, USA |
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no |
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RPLAB @ s @ nt_SIS_60at0p34THz |
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333 |
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Grimes, P.; Kittara, P.; Yassin, G.; Withington, S.; Jacobs, K. |
| Title |
Investigation of the performance of a 700 GHz nline mixer |
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Conference Article |
| Year |
2003 |
Publication |
Proc. 14th Int. Symp. Space Terahertz Technol. |
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247 |
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Tucson, USA |
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no |
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RPLAB @ s @ nt_SIS_250at0p69THz |
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336 |
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Hajenius, M.; Baselmans, J. J. A.; Gao, J. R.; Klapwijk, T. M.; de Korte, P. A. J.; Voronov, B.; Gol’tsman, G. |
| Title |
Improved NbN phonon cooled hot electron bolometer mixers |
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Conference Article |
| Year |
2003 |
Publication |
Proc. 14th Int. Symp. Space Terahertz Technol. |
Abbreviated Journal |
Proc. 14th Int. Symp. Space Terahertz Technol. |
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Pages |
413-423 |
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NbN HEB mixers |
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NbN phonon-cooled hot electron bolometer mixers (HEBs) have been realized with negligible contact resistance to Au pads. By adding either a 5 nm Nb or a 10 nm NbTiN layer between the Au and NbN, to preserve superconductivity in the NbN under the Au contact pad, superior noise temperatures have been obtained. Using DC I,V curves and resistive transitions in combination with process parameters we analyze the nature of these improved devices and determine interface transparencies. |
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Tucson, USA |
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337 |
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Amato, Michael J.; Benford, Dominic J.; Moseley, Harvey S.; Juan Roman |
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An engineering concept and enabling technologies for a large single aperture far-infrared observatory (SAFIR) |
Type |
Conference Article |
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2003 |
Publication |
Proc. SPIE |
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4850 |
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Pages |
1120-1131 |
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RPLAB @ s @ sun_shield_SAFIR_SPIE_2003 |
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339 |
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Albert Betz; Rita Boreiko; Yongdong Zhou; Jun Jhao; Yusuf Selamet; Yong Chang; Renganathan Ashokan; Charlie Bukcer; Sivalingam Sivanathan |
| Title |
HgCdTe photoconductive mixers for 3-15 terahertz |
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Conference Article |
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2003 |
Publication |
Proc. 14th Int. Symp. Space Terahertz Technol. |
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102-111 |
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Tucson, USA |
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no |
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RPLAB @ s @ HgCdTe_at3to15THz_fabr |
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338 |
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Tong, C.-Y. E.; Meledin, D.; Loudkov, D.; Blundell, R.; Erickson, N.; Kawamura, J.; Mehdi, I.; Gol’tsman, G. |
| Title |
A 1.5 THz Hot-Electron Bolometer mixer operated by a planar diode based local oscillator |
Type |
Conference Article |
| Year |
2003 |
Publication |
IEEE MTT-S Int. Microwave Symp. Digest |
Abbreviated Journal |
IEEE MTT-S Int. Microwave Symp. Digest |
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2 |
Issue |
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Pages |
751-754 |
| Keywords |
waveguide NbN HEB mixers |
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We have developed a 1.5 THz superconducting NbN Hot-Electron Bolometer mixer. It is operated by an all-solid-state Local Oscillator comprising of a cascade of 4 planar doublers following an MMIC based W-band power amplifier. The threshold available pump power is estimated to be 1 /spl mu/W. |
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Philadelphia, PA, USA |
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1516 |
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Meledin, D.; Tong, C. Y.-E.; Blundell, R.; Kaurova, N.; Smirnov, K.; Voronov, B.; Gol'tsman, G. |
| Title |
Study of the IF bandwidth of NbN HEB mixers based on crystalline quartz substrate with an MgO buffer layer |
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Journal Article |
| Year |
2003 |
Publication |
IEEE Trans. Appl. Supercond. |
Abbreviated Journal |
IEEE Trans. Appl. Supercond. |
| Volume |
13 |
Issue |
2 |
Pages |
164-167 |
| Keywords |
NbN HEB mixer |
| Abstract |
In this paper, we present the results of IF bandwidth measurements on 3-4 nm thick NbN hot electron bolometer waveguide mixers, which have been fabricated on a 200-nm thick MgO buffer layer deposited on a crystalline quartz substrate. The 3-dB IF bandwidth, measured at an LO frequency of 0.81 THz, is 3.7 GHz at the optimal bias point for low noise receiver operation. We have also made measurements of the IF dynamic impedance, which allow us to evaluate the intrinsic electron temperature relaxation time and self-heating parameters at different bias conditions. |
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