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Hovenier J.N.; Adam A.J.L.; Kašalynas I.; Gao J.R.; Klaassen T.O.; Baryshev A.; Williams B.S.; Kumar S.; Hu Q.; Reno J.L. |
| Title |
Phase-locking on the beat signal of a two-mode 2.7 terahertz metal-metal quantum cascade laser |
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Conference Article |
| Year |
2006 |
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Proc. Symp. IEEE/LEOS Benelux Chapter |
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125-128 |
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We have studied the linewidth and phase-locking of a 2.7 THz quantum cascade laser by using a superconducting bolometer mixer. The 8 GHz beat signal is compared with a microwave reference with a feedback to the laser bias current. Phase locking has been demonstrated, resulting in an extremely narrow beat linewidth of less than 10 Hz. Under frequency-stabilization conditions we find that the line profile is virtually Lorentzian with a long-term minimum linewidth of the THz modes of about 6.3 kHz. Temperature dependent measurements suggestthat this linewidthdoes not approach the Schawlow-Townes limit. |
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RPLAB @ atomics90 @ |
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968 |
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Hu, Xiaolong; Dauler, Eric A.; Kerman, Andrew J.; Yang, Joel K. W.; White, James E.; Herder, Charles H.; Berggren, Karl K. |
| Title |
Using surface plasmons to enhance the speed and efficiency of superconducting nanowire single-photon detectors |
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Conference Article |
| Year |
2009 |
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Proceedings of the Conference on Lasers and Electro-Optics, 2009 and 2009 Conference on Quantum electronics and Laser Science Conference |
Abbreviated Journal |
Proc of Conf. on Lasers and El.-Opt. |
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1-2 |
| Keywords |
optical antennas |
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We report our design and fabrication of superconducting nanowire single-photon detectors integrated with gold plasmonic nanostructures, which can enhance the absorption of TM-polarized light, and can enlarge the effective area without sacrificing detector speed. |
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RPLAB @ gujma @ |
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744 |
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Hübers, H. W.; Pavlov, S. G.; Semenov, A. D.; Tredicucci, A.; Köhler, R.; Mahler, L.; Beere, H. E.; Linfield, E. H.; Ritchie, D. A. |
| Title |
Investigation of a 2.5 THz quantum cascade laser as local oscillator |
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Conference Article |
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2005 |
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Proc. 16th Int. Symp. Space Terahertz Technol. |
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18 |
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Göteborg, Sweden |
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RPLAB @ s @ qc_lasers_huebers |
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366 |
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Hübers, H.-W.; Semenov, A. D.; Richter, H.; Schubert, J.; Hadjiloucas, S.; Bowen, J. W.; Gol'tsman, G.; Voronov, B. M.; Gershenzon, E. M. |
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Antenna pattern of the quasi-optical hot-electron bolometric mixer at terahertz frequencies |
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Conference Article |
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2001 |
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Proc. 12th Int. Symp. Space Terahertz Technol. |
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Proc. 12th Int. Symp. Space Terahertz Technol. |
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286-296 |
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NbN HEB mixers |
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San Diego, CA, USA |
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323 |
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Hübers, H.-W.; Schubert, J.; Krabbe, A.; Birk, M.; Wagner, G.; Semenov, A.; Gol’tsman, G.; Voronov, B.; Gershenzon, E. |
| Title |
Parylene anti-reflection coating of a quasi-optical hot-electron-bolometric mixer at terahertz frequencies |
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Journal Article |
| Year |
2001 |
Publication |
Infrared Physics & Technology |
Abbreviated Journal |
Infrared Physics & Technology |
| Volume |
42 |
Issue |
1 |
Pages |
41-47 |
| Keywords |
NbN HEB mixers, anti-reflection coating |
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Parylene C was investigated as anti-reflection coating for silicon at terahertz frequencies. Measurements with a Fourier-transform spectrometer show that the transmittance of pure silicon can be improved by about 30% when applying a layer of Parylene C with a quarter wavelength optical thickness. The 10% bandwidth of this coating extends from 1.5 to 3 THz for a center frequency of 2.3–2.5 THz, where the transmittance is constant. Heterodyne measurements demonstrate that the noise temperature of a hot-electron-bolometric mixer can be reduced significantly by coating the silicon lens of the hybrid antenna with a quarter wavelength Parylene C layer. Compared to the same mixer with an uncoated lens the improvement is about 30% at a frequency of 2.5 THz. |
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1350-4495 |
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1548 |
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