|
|
Ganzevles WFM, Gao JR, de Korte PAJ, Klapwijk TM. Direct response of microstrip line coupled Nb THz hot-electron bolometer mixers. Appl Phys Lett. 2001;79(15):2483–5.
|
|
|
|
Kroug M. Hot electron bolometric mixers for a quasi-optical terahertz receiver [Ph.D. thesis]. Chalmers University of Technology, Gothenburg, Sweden; 2001.
|
|
|
|
Van Rudd J, Johnson JL, Mittleman DM. Cross-polarized angular emission patterns from lens-coupled terahertz antennas. J. Opt. Soc. Am. B. 2001;18(10):1524.
|
|
|
|
Kroug M, Cherednichenko S, Merkel H, Kollberg E, Voronov B, Gol'tsman G, et al. NbN hot electron bolometric mixers for terahertz receivers. IEEE Trans Appl Supercond. 2001;11(1):962–5.
Abstract: Sensitivity and gain bandwidth measurements of phonon-cooled NbN superconducting hot-electron bolometer mixers are presented. The best receiver noise temperatures are: 700 K at 1.6 THz and 1100 K at 2.5 THz. Parylene as an antireflection coating on silicon has been investigated and used in the optics of the receiver. The dependence of the mixer gain bandwidth (GBW) on the bias voltage has been measured. Starting from low bias voltages, close to operating conditions yielding the lowest noise temperature, the GBW increases towards higher bias voltages, up to three times the initial value. The highest measured GBW is 9 GHz within the same bias range the noise temperature increases by a factor of two.
|
|
|
|
Cherednichenko S, Kroug M, Merkel H, Kollberg E, Loudkov D, Smirnov K, et al. Local oscillator power requirement and saturation effects in NbN HEB mixers. In: Jet Propulsion Laboratory CIit.u.t.e of T, editor. Proc. 12th Int. Symp. Space Terahertz Technol. San Diego, CA, USA; 2001. p. 273–85.
Abstract: The local oscillator power required for NbN hot-electron bolometric mixers (P LO ) was investigated with respect to mixer size, critical temperature and ambient temperature. P LO can be decreased by a factor of 10 as the mixer size decreases from 4×0.4 µm 2 to 0.6×0.13 µm 2 . For the smallest volume mixer the optimal local oscillator power was found to be 15 nW. We found that for such mixer no signal compression was observed up to an input signal of 2 nW which corresponds to an equivalent input load of 20,000 K. For a constant mixer volume, reduction of T c can decrease optimal local oscillator power at least by a factor of 2 without a deterioration of the receiver noise temperature. Bath temperature was found to have minor effect on the receiver characteristics.
|
|
|
|
Kroug M, Cherednichenko S, Choumas M, Merkel H, Kollberg E, Hübers H-W, et al. HEB quasi-optical heterodyne receiver for THz frequencies. In: Proc. 12th Int. Symp. Space Terahertz Technol. San Diego, CA, USA; 2001. p. 244–52.
|
|
|
|
Hübers H-W, Semenov AD, Richter H, Schubert J, Hadjiloucas S, Bowen JW, et al. Antenna pattern of the quasi-optical hot-electron bolometric mixer at terahertz frequencies. In: Proc. 12th Int. Symp. Space Terahertz Technol. San Diego, CA, USA; 2001. p. 286–96.
|
|
|
|
Siemsen KJ, Bernard JE, Madej AA, Marmet L. Absolute frequency measurement of a CO2/OsO4 stabilized laser at 28.8 THz. Appl Phys B: Lasers and Optics. 2001;72:567–73.
|
|
|
|
Eliasson BJ. Metal-insulator-metal diodes for solar energy conversion [Ph.D. thesis].; 2001.
|
|
|
|
Shelkovnikov A, Grain C, Nguyen CT, Butcher RJ, Amy-Klein A, Chardonnet C. 500-Hz two-photon Ramsey fringes with a SF6 beam: towards a new frequency standard in the 30-THz spectral region. Appl Phys B: Lasers and Optics. 2001;73:93–8.
|
|
