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| Author | Stevens, M.; Hadfield, R.; Schwall, R.; Nam, S.W.; Mirin, R.; Gupta, J. | ||||
| Title | Fast lifetime measurements of infrared emitters using a low-jitter superconduct- ing single-photon detector | Type | Journal Article | ||
| Year | 2006 | Publication | Applied Physics Letters | Abbreviated Journal | Appl. Phys. Lett. |
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89 | Issue | Pages | 031109 | |
| Keywords | SSPD, jitter, QD, QW | ||||
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| Notes | Approved | no | |||
| Call Number | RPLAB @ akorneev @ | Serial | 611 | ||
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| Author | Walther, Christoph; Scalari, Giacomo; Faist, Jerome; Beere, Harvey; Ritchie, David | ||||
| Title | Low frequency terahertz quantum cascade laser operating from 1.6 to 1.8 THz | Type | Journal Article | ||
| Year | 2006 | Publication | Applied Physics Letters | Abbreviated Journal | Appl. Phys. Lett. |
| Volume |
89 | Issue | Pages | 231121(1-3) | |
| Keywords | QCL, 360 uW at 1.6 THz | ||||
| Abstract | The authors report a GaAs/Al0.1Ga0.9As quantum cascade laser based on a bound-to-continuum transition optimized for low frequency operation. High tunability of the gain curve is achieved by the Stark effect and laser emission is measured between 1.6 and 1.8 THz. Pulsed mode operation up to 95 K and continuous wave operation up to 80 K are reported. The dynamical range in current is as high as 43%. | ||||
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| Notes | Approved | no | |||
| Call Number | Serial | 629 | |||
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| Author | Baryshev A.; Hovenier J.N.; Adam A.J.L.; Kašalynas I.; Gao J.R.; Klaassen T.O.; Williams B.S.; Kumar S.; Hu Q.; Reno J.L. | ||||
| Title | Phase locking and spectral linewidth of a two-mode terahertz quantum cascade laser | Type | Journal Article | ||
| Year | 2006 | Publication | Physics Letters | Abbreviated Journal | |
| Volume |
89 | Issue | Pages | ||
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| Abstract | We have studied the phase locking and spectral linewidth of an ~ 2.7 THz quantum cascade laser by mixing its two lateral lasing modes. The beat signal at about 8 GHz is compared with a microwave eference by applying conventional phase lock loop circuitry with feedback to the laser bias current. Phase locking has been demonstrated, resulting in a narrow beat linewidth of less than 10 Hz. Under requency stabilization we find that the terahertz line profile is essentially Lorentzian with a minimum linewidth of ~ 6.3 kHz. Power dependent measurements suggest that this linewidth does not approach the Schawlow-Townes limit. | ||||
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| Notes | Approved | no | |||
| Call Number | RPLAB @ atomics90 @ | Serial | 967 | ||
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| Author | Słysz, W.; Węgrzecki, M.; Bar, J.; Grabiec, P.; Górska, M.; Zwiller, V.; Latta, C.; Bohi, P.; Milostnaya, I.; Minaeva, O.; Antipov, A.; Okunev, O.; Korneev, A.; Smirnov, K.; Voronov, B.; Kaurova, N.; Gol’tsman, G.; Pearlman, A.; Cross, A.; Komissarov, I.; Verevkin, A.; Sobolewski, R. | ||||
| Title | Fiber-coupled single-photon detectors based on NbN superconducting nanostructures for practical quantum cryptography and photon-correlation studies | Type | Journal Article | ||
| Year | 2006 | Publication | Appl. Phys. Lett. | Abbreviated Journal | Appl. Phys. Lett. |
| Volume |
88 | Issue | 26 | Pages | 261113 (1 to 3) |
| Keywords | SSPD, SNSPD | ||||
| Abstract | We have fabricated and tested a two-channel single-photon detector system based on two fiber-coupled superconducting single-photon detectors (SSPDs). Our best device reached the system quantum efficiency of 0.3% in the 1540-nm telecommunication wavelength with a fiber-to-detector coupling factor of about 30%. The photoresponse consisted of 2.5-ns-wide voltage pulses with a rise time of 250ps and timing jitter below 40ps. The overall system response time, measured as a second-order, photon cross-correlation function, was below 400ps. Our SSPDs operate at 4.2K inside a liquid-helium Dewar, but their optical fiber inputs and electrical outputs are at room temperature. Our two-channel detector system should find applications in practical quantum cryptography and in antibunching-type quantum correlation measurements. The authors would like to thank Dr. Marc Currie for his assistance in early time-resolved photoresponse measurements and Professor Atac Imamoglu for his support. This work was supported by the Polish Ministry of Science under Project No. 3 T11B 052 26 (Warsaw), RFBR 03-02-17697 and INTAS 03-51-4145 grants (Moscow), CRDF Grant No. RE2-2531-MO-03 (Moscow), RE2-2529-MO-03 (Moscow and Rochester), and US AFOSR FA9550-04-1-0123 (Rochester). Additional funding was provided by the grants from the MIT Lincoln Laboratory and BBN Technologies Corp. |
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| ISSN | 0003-6951 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | Serial | 1449 | |||
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| Author | Kerman, A. J.; Dauler, E. A.; Keicher, W. E.; Yang, J. K. W.; Berggren, K. K.; Gol’tsman, G.; Voronov, B. | ||||
| Title | Kinetic-inductance-limited reset time of superconducting nanowire photon counters | Type | Journal Article | ||
| Year | 2006 | Publication | Appl. Phys. Lett. | Abbreviated Journal | Appl. Phys. Lett. |
| Volume |
88 | Issue | 11 | Pages | 111116 (1 to 3) |
| Keywords | NbN SSPD, SNSPD | ||||
| Abstract | We investigate the recovery of superconducting NbN-nanowire photon counters after detection of an optical pulse at a wavelength of 1550nm, and present a model that quantitatively accounts for our observations. The reset time is found to be limited by the large kinetic inductance of these nanowires, which forces a tradeoff between counting rate and either detection efficiency or active area. Devices of usable size and high detection efficiency are found to have reset times orders of magnitude longer than their intrinsic photoresponse time. The authors acknowledge D. Oates and W. Oliver (MIT Lincoln Laboratory), S.W. Nam, A. Miller, and R. Hadfield (NIST) and R. Sobolewski, A. Pearlman, and A. Verevkin (University of Rochester) for helpful discussions and technical assistance. This work made use of MIT’s shared scanning-electron-beam-lithography facility in the Research Laboratory of Electronics. This work is sponsored by the United States Air Force under Air Force Contract No. FA8721-05-C-0002. Opinions, interpretations, recommendations and conclusions are those of the authors and are not necessarily endorsed by the United States Government. |
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| ISSN | 0003-6951 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 1453 | |||
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| Author | Jiang, Ling; Miao, Wei; Zhang, Wen; Li, Ning; Lin, Zhen Hui; Yao, Qi Jun; Shi, Sheng-Cai; Svechnikov, S. I.; Vakhtomin, Y. B.; Antipov, S. V.; Voronov, B. M.; Kaurova, N. S.; Gol'tsman, G. N. | ||||
| Title | Characterization of a quasi-optical NbN superconducting HEB mixer | Type | Journal Article | ||
| Year | 2006 | Publication | IEEE Trans. Microwave Theory Techn. | Abbreviated Journal | IEEE Trans. Microwave Theory Techn. |
| Volume |
54 | Issue | 7 | Pages | 2944-2948 |
| Keywords | NbN HEB mixers | ||||
| Abstract | In this paper, the performance of a quasi-optical NbN superconducting hot-electron bolometer (HEB) mixer, cryogenically cooled by a close-cycled 4-K refrigerator, is thoroughly investigated at 300, 500, and 850 GHz. The lowest receiver noise temperatures measured at the respective three frequencies are 1400, 900, and 1350 K, which can go down to 659, 413, and 529 K, respectively, after correcting the loss and associated noise contribution of the quasi-optical system before the measured superconducting HEB mixer. The stability of the quasi-optical superconducting HEB mixer is also investigated here. The Allan variance time measured with a local oscillator pumping at 500 GHz and an IF bandwidth of 110 MHz is 1.5 s at the dc-bias voltage exhibiting the lowest noise temperature and increases to 2.5 s at a dc bias twice that voltage. | ||||
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| ISSN | 0018-9480 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 1448 | |||
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| Author | Koshelets, V. P.; Khudchenko, A. V. | ||||
| Title | Analysis of spectral characteristics of a superconducting integrated receiver | Type | Journal Article | ||
| Year | 2006 | Publication | J. Communications Technol. Electron. | Abbreviated Journal | |
| Volume |
51 | Issue | 5 | Pages | 596-603 |
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| Notes | Approved | no | |||
| Call Number | RPLAB @ s @ mix_SIR | Serial | 400 | ||
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| Author | Koshelets, V. P.; Khudchenko, A. V. | ||||
| Title | Analysis of spectral characteristics of a superconducting integrated receiver | Type | Journal Article | ||
| Year | 2006 | Publication | J. Communications Technol. Electron. | Abbreviated Journal | |
| Volume |
51 | Issue | 5 | Pages | 596-603 |
| Keywords | SIR | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 1064-2269 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 526 | |||
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| Author | Brown, E. R.; Lee, A. W. M.; Navi, B. S.; Bjarnason, J. E. | ||||
| Title | Characterization of a planar self-complementary square-spiral antenna in the THz region | Type | Journal Article | ||
| Year | 2006 | Publication | Microwave and Optical Technology Letters | Abbreviated Journal | Microwave Opt Technol Lett |
| Volume |
48 | Issue | 3 | Pages | 524-529 |
| Keywords | optical antennas; square spiral antenna; self complementary THz; photomixing; lens; method of moments; geometric optics; physical optics | ||||
| Abstract | This paper describes a compact, self-complementary square-spiral antenna on a GaAs substrate with a broadside high-directivity (~9 dB) frequency-independent pattern when coupled through a silicon hyperhemisphere. The driving-point resistance undulates between ~00 and 300Ω from 200 GHz to 1 THz—much higher than the 72Ω value from Booker's modified formula, but quite beneficial for coupling to high-impedance broadband devices | ||||
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| Notes | Approved | no | |||
| Call Number | RPLAB @ gujma @ | Serial | 736 | ||
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| Author | McDonald, P.C.; Jaramillo, E.; Baudouy, B. | ||||
| Title | Thermal design of the CFRP support struts for the spatial framework of the Herschel Space Observatory | Type | Journal Article | ||
| Year | 2006 | Publication | Cryogenics | Abbreviated Journal | Cryogenics |
| Volume |
46 | Issue | 4 | Pages | 298-304 |
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| ISSN | 0011-2275 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | RPLAB @ s @ | Serial | 442 | ||
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| Author | Koshelets, V. P.; Ermakov, A. B.; Filippenko, L. V.; Koryukin, O. V.; Khudchenko, A. V.; Sobolev, A. S.; Torgashin, M. Yu.; Yagoubov, P. A.; Hoogeveen, R. W. M.; Vreeling, W. J.; Wild, W.; Pylypenko, O. M. | ||||
| Title | Superconducting submm integrated receiver for TELIS | Type | Conference Article | ||
| Year | 2006 | Publication | J. Phys.: Conf. Ser. | Abbreviated Journal | J. Phys.: Conf. Ser. |
| Volume |
43 | Issue | Pages | 1377-1380 | |
| Keywords | SIR | ||||
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| ISSN | 1742-6588 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 514 | |||
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| Author | Milostnaya, I.; Korneev, A.; Rubtsova, I.; Seleznev, V.; Minaeva, O.; Chulkova, G.; Okunev, O.; Voronov, B.; Smirnov, K.; Gol'tsman, G.; Slysz, W.; Wegrzecki, M.; Guziewicz, M.; Bar, J.; Gorska, M.; Pearlman, A.; Kitaygorsky, J.; Cross, A.; Sobolewski, R. | ||||
| Title | Superconducting single-photon detectors designed for operation at 1.55-µm telecommunication wavelength | Type | Conference Article | ||
| Year | 2006 | Publication | J. Phys.: Conf. Ser. | Abbreviated Journal | J. Phys.: Conf. Ser. |
| Volume |
43 | Issue | Pages | 1334-1337 | |
| Keywords | NbN SSPD, SNSPD | ||||
| Abstract | We report on our progress in development of superconducting single-photon detectors (SSPDs), specifically designed for secure high-speed quantum communications. The SSPDs consist of NbN-based meander nanostructures and operate at liquid helium temperatures. In general, our devices are capable of GHz-rate photon counting in a spectral range from visible light to mid-infrared. The device jitter is 18 ps and dark counts can reach negligibly small levels. The quantum efficiency (QE) of our best SSPDs for visible-light photons approaches a saturation level of ~30-40%, which is limited by the NbN film absorption. For the infrared range (1.55µm), QE is ~6% at 4.2 K, but it can be significantly improved by reduction of the operation temperature to the 2-K level, when QE reaches ~20% for 1.55-µm photons. In order to further enhance the SSPD efficiency at the wavelength of 1.55 µm, we have integrated our detectors with optical cavities, aiming to increase the effective interaction of the photon with the superconducting meander and, therefore, increase the QE. A successful effort was made to fabricate an advanced SSPD structure with an optical microcavity optimized for absorption of 1.55 µm photons. The design consisted of a quarter-wave dielectric layer, combined with a metallic mirror. Early tests performed on relatively low-QE devices integrated with microcavities, showed that the QE value at the resonator maximum (1.55-µm wavelength) was of the factor 3-to-4 higher than that for a nonresonant SSPD. Independently, we have successfully coupled our SSPDs to single-mode optical fibers. The completed receivers, inserted into a liquid-helium transport dewar, reached ~1% system QE for 1.55 µm photons. The SSPD receivers that are fiber-coupled and, simultaneously, integrated with resonators are expected to be the ultimate photon counters for optical quantum communications. | ||||
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| ISSN | 1742-6588 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 1450 | |||
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| Author | Gordon, N. T.; Lees, D. J.; Bowen, G.; Phillips, T. S.; Haigh, M.; Jones, C. L.; Maxey, C. D.; Hipwood, L.; Catchpole, R. A. | ||||
| Title | HgCdTe detectors operating above 200 K | Type | Journal Article | ||
| Year | 2006 | Publication | J. Electron. Mater. | Abbreviated Journal | |
| Volume |
35 | Issue | 6 | Pages | 1140-1144 |
| Keywords | HgCdTe detector | ||||
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| ISSN | 0361-5235 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 467 | |||
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| Author | Semenov, A. D.; Il'in, K.; Siegel, M.; Smirnov, A.; Pavlov, S.; Richter, H.; Hübers, H.-W. | ||||
| Title | Evidence of non-bolometric mixing in the bandwidth of a hot-electron bolometer | Type | Journal Article | ||
| Year | 2006 | Publication | Superconductor Science and Technology | Abbreviated Journal | Supercond. Sci. Technol. |
| Volume |
19 | Issue | 10 | Pages | 1051-1056 |
| Keywords | HEB | ||||
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| ISSN | 0953-2048 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 536 | |||
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| Author | Yang, Z. Q.; Hajenius, M.; Baselmans, J. J. A.; Gao, J. R.; Voronov, B.; Gol’tsman, G. N. | ||||
| Title | Reduced noise in NbN hot-electron bolometer mixers by annealing | Type | Journal Article | ||
| Year | 2006 | Publication | Supercond. Sci. Technol. | Abbreviated Journal | Supercond. Sci. Technol. |
| Volume |
19 | Issue | 4 | Pages | L (9 to 12) |
| Keywords | NbN HEB mixers | ||||
| Abstract | We find that the sensitivity of heterodyne receivers based on superconducting hot-electron bolometers (HEBs) increases by 25–30% after annealing at 85 °C in vacuum. The devices studied are twin-slot antenna coupled mixers with a small NbN bridge of 1 × 0.15 µm2. We show that annealing changes the device properties as reflected in sharper resistive transitions of the complete device, apparently reducing the device-related noise. The lowest receiver noise temperature of 700 K is measured at a local oscillator frequency of 1.63 THz and a bath temperature of 4.3 K. | ||||
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| ISSN | 0953-2048 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 1456 | |||
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