ISSTT Proceedings

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Systematic Study of IF Bandwidth in HTS Hot-Electron Bolometer Mixers

Authors:
Oliver Harnack, Konstantin Ilin, Michael Siegel, Boris S. Karasik, William R. McGrath, Gert de Lange
Abstract:
The hot-electron bolometer (HEB) mixer made from a high-To superconductor (HTS) thin film was introduced recently as an alternative to a Schottky mixer at THz frequencies. The mixer performance depends on the total thermal conductance for heat removal from the phonon subsystem due to either phonon escape to the substrate or phonon diffusion to the normal metal electrodes. We present a systematic study of the length, thickness, temperature, and local oscillator (LO) frequency dependencies of the thermal relaxation times, as inferred from the -3dB intermediate frequency (IF) bandwidth of HTS HEB mixers on MgO and Ce02/sapphire substrates. While a significant length dependence was not found, the bandwidth of a 30 nm thick device at 65 K increased from about 100 MHz to 420 MHz as the device thickness was reduced to 10 nm in accordance with the two-temperature (2T) model.
Categories:
High TC
Year:
2000
Session:
9
Full-text:
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Page Number(s):
516