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Zhang, Wen; Li, Ning; Jiang, Ling; Miao, Wei; Lin, Zhen-Hui; Yao, Qi-Jun; Shi, Sheng-Cai; Chen, Jian; Wu, Pei-Heng; Svechnikov, S. I.; Vachtomin, Y. B.; Antipov, S. V.; Voronov, B. M.; Gol'tsman, G. N. |
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Title |
Noise behaviour of a THz superconducting hot-electron bolometer mixer |
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2007 |
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Chinese Phys. Lett. |
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Chinese Phys. Lett. |
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24 |
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6 |
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1778-1781 |
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NbN HEB mixers |
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A quasi-optical superconducting NbN hot-electron bolometer (HEB) mixer is measured in the frequency range of 0.5–2.5 THz for understanding of the frequency dependence of noise temperature of THz coherent detectors. It has been found that noise temperature increasing with frequency is mainly due to the coupling loss between the quasi-optical planar antenna and the superconducting HEB bridge when taking account of non-uniform distribution of high-frequency current. With the coupling loss corrected, the superconducting HEB mixer demonstrates a noise temperature nearly independent of frequency. |
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0256-307X |
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1430 |
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Kawamura, J.; Blundell, R.; Tong, C.-yu E.; Gol’tsman, G.; Gershenzon, E.; Voronov, B.; Cherednichenko, S. |
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Low noise NbN lattice-cooled superconducting hot-electron bolometric mixers at submillimeter wavelengths |
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1997 |
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Appl. Phys. Lett. |
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Appl. Phys. Lett. |
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70 |
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12 |
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1619-1621 |
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NbN HEB mixers |
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Lattice-cooled superconducting hot-electron bolometric mixers are used in a submillimeter-wave waveguide heterodyne receiver. The mixer elements are niobium nitride film with 3.5 nm thickness and ∼10 μm2 area. The local oscillator power for optimal performance is estimated to be 0.5 μW, and the instantaneous bandwidth is 2.2 GHz. At an intermediate frequency centered at 1.4 GHz with 200 MHz bandwidth, the double sideband receiver noise temperature is 410 K at 430 GHz. The receiver has been used to detect molecular line emission in a laboratory gas cell. |
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0003-6951 |
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1599 |
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Hong, Kyushik; Marsh, P. F.; Geok-Ing Ng; Pavlidis, D.; Hong, Chang-Hee |
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Optimization of MOVPE grown InxAl1-xAs/In0.53Ga0.47As planar heteroepitaxial Schottky diodes for terahertz applications |
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1994 |
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IEEE Trans. Electron Devices |
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41 |
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9 |
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1489-1497 |
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253 |
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Karpowicz, Nicholas; Lu, Xiaofei; Zhang, X.-C. |
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Terahertz gas photonics |
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2009 |
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J. Modern Opt. |
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56 |
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10 |
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1137-1150 |
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The underlying physics of the generation and detection of terahertz (THz) waves in gases are described. The THz wave generation process takes place in two steps: asymmetric gas ionization by two-frequency laser fields, followed by interaction of the ionized electron wave packets with the surrounding medium, producing an intense ‘echo' with tunable spectral content. In order to clarify the physical picture at the moment of ionization, the laser–atom interaction is treated through solution of the time-dependent Schrödinger equation, yielding an ab initio understanding of the release of the electron wave packets. The second step, where the electrons interact with the surrounding plasma is treated analytically. The resulting pressure dependence of the THz radiation is explored in detail. The THz wave detection process is shown to be the result of four-wave mixing, leading to analytical expressions of the signal obtained which allow for improved optimization of systems that exploit these effects. |
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RPLAB @ gujma @ |
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670 |
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Semenov, A. D.; Il'in, K.; Siegel, M.; Smirnov, A.; Pavlov, S.; Richter, H.; Hübers, H.-W. |
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Evidence of non-bolometric mixing in the bandwidth of a hot-electron bolometer |
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2006 |
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Superconductor Science and Technology |
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Supercond. Sci. Technol. |
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19 |
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10 |
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1051-1056 |
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HEB |
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0953-2048 |
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