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Siddiqi, I.; Prober, D. E. |
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Title |
Nb–Au bilayer hot-electron bolometers for low-noise THz heterodyne detection |
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Journal Article |
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Year |
2004 |
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Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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84 |
Issue |
8 |
Pages |
1404 |
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Keywords |
HEB, mixers, dynamic range, saturation, LO power, local oscillator power, Nb |
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Abstract |
The sensitivity of present Nb diffusion-cooled hot-electron bolometer (HEB) mixers is not quantum limited, and can be improved by reducing the superconducting transition temperature TC. Lowering TC reduces thermal fluctuations, resulting in a decrease of the mixer noise temperature TM. However, lower TC mixers have reduced dynamic range and saturate more easily due to background noise. We present 30 GHz microwave measurements on a bilayer HEB system, Nb–Au, in which TC can be tuned with Au layer thickness to obtain the maximum sensitivity for a given noise background. These measurements are intended as a guide for the optimization of THz mixers. Using a Nb–Au mixer with TC = 1.6 K, we obtain TM = 50 K with 2 nW of local oscillator (LO) power. Good mixer performance is observed over a wide range of LO power and bias voltage and such a device should not exhibit saturation in a THz receiver. |
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0003-6951 |
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571 |
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Zwiller, V.; Aichele, T.; Seifert, W.; Persson, J.; Benson, O. |
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Title |
Generating visible single photons on demand with single InP quantum dots |
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Journal Article |
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Year |
2003 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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82 |
Issue |
10 |
Pages |
1509-1511 |
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Keywords |
single photon, quantum dot, InP |
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0003-6951 |
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503 |
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Burke, P. J.; Schoelkopf, R. J.; Prober, D. E.; Skalare, A.; Karasik, B. S.; Gaidis, M. C.; McGrath, W. R.; Bumble, B.; Leduc, H. G. |
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Title |
Spectrum of thermal fluctuation noise in diffusion and phonon cooled hot-electron mixers |
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Journal Article |
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Year |
1998 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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72 |
Issue |
12 |
Pages |
1516-1518 |
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HEB mixer; thermal fluctuation noise; TFN |
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A systematic study of the intermediate frequency noise bandwidth of Nb thin-film superconducting hot-electron bolometers is presented. We have measured the spectrum of the output noise as well as the conversion efficiency over a very broad intermediate frequency range (from 0.1 to 7.5 GHz) for devices varying in length from 0.08 μm to 3 μm. Local oscillator and rf signals from 8 to 40 GHz were used. For a device of a given length, the spectrum of the output noise and the conversion efficiency behave similarly for intermediate frequencies less than the gain bandwidth, in accordance with a simple thermal model for both the mixing and thermal fluctuation noise. For higher intermediate frequencies the conversion efficiency decreases; in contrast, the noise decreases but has a second contribution which dominates at higher frequency. The noise bandwidth is larger than the gain bandwidth, and the mixer noise is low, between 120 and 530 K (double side band). |
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RPLAB @ gujma @ |
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760 |
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Mason, Whitney; Waterman, J. R. |
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Electrical and optical characteristics of two color mid wave HgCdTe infrared detectors |
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1999 |
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Applied Physics Letters |
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Appl. Phys. Lett. |
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74 |
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11 |
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1633-1635 |
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0003-6951 |
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RPLAB @ s @ |
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461 |
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Author |
Karasik, B. S.; Il'in, K. S.; Pechen, E. V.; Krasnosvobodtsev, S. I. |
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Title |
Diffusion cooling mechanism in a hot-electron NbC microbolometer mixer |
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Journal Article |
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1996 |
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Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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68 |
Issue |
16 |
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2285-2287 |
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Keywords |
HEB mixer, diffusion cooling channel, diffusion channel |
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0003-6951 |
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262 |
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