| Records |
| Author |
Zwiller, V.; Aichele, T.; Seifert, W.; Persson, J.; Benson, O. |
| Title |
Generating visible single photons on demand with single InP quantum dots |
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Journal Article |
| Year |
2003 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
| Volume |
82 |
Issue |
10 |
Pages |
1509-1511 |
| Keywords |
single photon, quantum dot, InP |
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| ISSN |
0003-6951 |
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503 |
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| Author |
Semenov, A.; Engel, A.; Il'in, K.; Gol'tsman, G.; Siegel, M.; Hübers, H.-W. |
| Title |
Ultimate performance of a superconducting quantum detector |
Type |
Journal Article |
| Year |
2003 |
Publication |
Eur. Phys. J. Appl. Phys. |
Abbreviated Journal |
Eur. Phys. J. Appl. Phys. |
| Volume |
21 |
Issue |
3 |
Pages |
171-178 |
| Keywords |
NbN SSPD, SNSPD |
| Abstract |
We analyze the ultimate performance of a superconducting quantum detector in order to meet requirements for applications in near-infrared astronomy and X-ray spectroscopy. The detector exploits a combined detection mechanism, in which avalanche quasiparticle multiplication and the supercurrent jointly produce a voltage response to a single absorbed photon via successive formation of a photon-induced and a current-induced normal hotspot in a narrow superconducting strip. The response time of the detector should increase with the photon energy providing energy resolution. Depending on the superconducting material and operation conditions, the cut-off wavelength for the single-photon detection regime varies from infrared waves to visible light. We simulated the performance of the background-limited infrared direct detector and X-ray photon counter utilizing the above mechanism. Low dark count rate and intrinsic low-frequency cut-off allow for realizing a background limited noise equivalent power of 10−20 W Hz−1/2 for a far-infrared direct detector exposed to 4-K background radiation. At low temperatures, the intrinsic response time of the counter is rather determined by diffusion of nonequilibrium electrons than by the rate of energy transfer to phonons. Therefore, thermal fluctuations do not hamper energy resolution of the X-ray photon counter that should be better than 10−3 for 6-keV photons. Comparison of new data obtained with a Nb based detector and previously reported results on NbN quantum detectors support our estimates of ultimate detector performance. |
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1286-0042 |
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no |
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534 |
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Tong, C.-Y.E.; Meledin, D.V.; Marrone, D.P.; Paine, S.N.; Gibson, H.; Blundell, R. |
| Title |
Near field vector beam measurements at 1 THz |
Type |
Journal Article |
| Year |
2003 |
Publication |
IEEE Microw. Compon. Lett. |
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| Volume |
13 |
Issue |
6 |
Pages |
235-237 |
| Keywords |
HEB, mixer, waveguide, LO power, local oscillator power, saturation effect, dynamic range |
| Abstract |
We have performed near-field vector beam measurements at 1.03 THz to characterize and align the receiver optics of a superconducting receiver. The signal source is a harmonic generator mounted on an X-Y translation stage. We model the measured two-dimensional complex beam pattern by a fundamental Gaussian mode, from which we derive the position of the beam center, the beam radius and the direction of propagation. By performing scans in the planes separated by 400 mm, we have confirmed that our beam pattern measurements are highly reliable. |
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1531-1309 |
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RPLAB @ lobanovyury @ |
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574 |
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Hirata, A.; Harada, M.; Nagatsuma, T. |
| Title |
120-GHz wireless link using photonic techniques for generation, modulation, and emission of millimeter-wave signals |
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Journal Article |
| Year |
2003 |
Publication |
J. of Lightwave Technology |
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| Volume |
21 |
Issue |
10 |
Pages |
2145-2153 |
| Keywords |
subterahartz terahertz THz communications |
| Abstract |
We present a wireless link system that uses millimeter-wave (MMW) photonic techniques. The photonic transmitter in the wireless link consists of an optical 120-GHz MMW generator, an optical modulator, and a high-power photonic MMW emitter. A uni-traveling carrier photodiode (UTC-PD) was used as the photonic emitter in order to eliminate electronic MMW amplifiers. We evaluated the dependence of UTC-PD output power on its transit-time limited bandwidth and its CR-time constant limited bandwidth, and employed a UTC-PD with the highest output power for the photonic emitter. As for the MMW generation, we developed a 120-GHz optical MMW generator that generates a pulse train and one that generates a sinusoidal signal. The UTC-PD output power generated by a narrow pulse train was higher than that generated by sinusoidal signals under the same average optical power condition, which contributes to reducing the photocurrent of the photonic emitter. We have experimentally demonstrated that the photonic transmitter can transmit data at up to 3.0 Gb/s. The wireless link using the photonic transmitter can be applied to optical gigabit Ethernet signals. |
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592 |
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Tinkham, M.; Free, J. U.; Lau, C. N.; Markovic, N. |
| Title |
Hysteretic I–V curves of superconducting nanowires |
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Journal Article |
| Year |
2003 |
Publication |
Phys. Rev. B |
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68 |
Issue |
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Pages |
134515(1 to 7) |
| Keywords |
MoGe nanowires, self-heating effect |
| Abstract |
Experimental I–V curves of superconducting MoGe nanowires show hysteresis for the thicker wires and none for the thinner wires. A rather quantitative account of these data for representative wires is obtained by numerically solving the one-dimensional heat flow equation to find a self-consistent distribution of temperature and local resistivity along the wire, using the measured linear resistance R(T) as input. This suggests that the retrapping current in the hysteretic I–V curves is primarily determined by heating effects, and not by the dynamics of phase motion in a tilted washboard potential as often assumed. Heating effects and thermal fluctuations from the low-resistance state to a high-resistance, quasinormal regime appear to set independent upper bounds for the switching current. |
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918 |
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