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- W2145464098 abstract "Diffusion-cooled aluminum hot-electron bolometer (HEB) mixers are of interest for low-noise high resolution THz-frequency spectroscopy within astrophysics. Al HEB mixers offer operation with an order of magnitude less local oscillator power, higher intermediate frequency bandwidth and potentially lower noise than competing devices made from other materials. We report on mixer experiments at 618 GHz with devices fabricated from films with sheet resistances in the range from about 55 /spl Omega/ down to about 9 /spl Omega/ per square. Intermediate frequency bandwidths of up to 3 GHz were measured (1 /spl mu/m long device), with absorbed local oscillator power levels of 0.5 to 6 nW and mixer conversion up to -21.5 dB. High input coupling efficiency implies that the electrons in the device are able to thermalize before escaping from the device. It was found that the long coherence length complicates mixer operations due to the proximity of the contact pads. Also, saturation at the IF frequency may be a concern for this type of device, and warrants further studies." @default.
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- W2145464098 date "2001-03-01" @default.
- W2145464098 modified "2023-09-30" @default.
- W2145464098 title "Aluminum hot-electron bolometer mixers at submillimeter wavelengths" @default.
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- W2145464098 doi "https://doi.org/10.1109/77.919426" @default.
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