Superconducting Nb DHEB Mixer Arrays for Far-Infrared Spectroscopy

Details Superconducting Nb DHEB Mixer Arrays for Far-Infrared Spectroscopy Superconducting Nb DHEB Mixer Arrays for Far-Infrared Spectroscopy

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001stin...0238944g&link_type=abstract

Proceedings of the Twenlfth International Symposium on Space Terahertz Technology, p. 168

Physics

Bolometers, Critical Temperature, Focal Plane Devices, Mixing Circuits, Superconductors (Materials), Frequency Response, Infrared Spectroscopy, Thin Films

Scientific paper

We are developing a heterodyne focal plane array with up to eight elements to study lines of the interstellar medium and planetary atmospheres with frequencies of 2 THz and above. Our fabrication process utilizes selective ion milling techniques to produce Nb Diffusion-Cooled Hot Electron Bolometric (DHEB) mixers from a bilayer thin film of Au/Nb deposited on a silicon substrate. A micro-bridge of 10 nm thick Nb forms the HEB device. The first generation of devices with lateral dimensions of 100 nm by 80 nm were fabricated at the feed of a broadband spiral antenna with a frequency response designed for up to 16 THz. Harmonic multiplier sources becoming available within the next few years should have sufficient power to provide a local-oscillator source for small-format, quasi-optically coupled arrays of these mixers. First generation devices measured at our laboratory have demonstrated a critical temperature (Tc) of 4.8 K with a 0.5 K transition width. These DHEB mixers are expected to have an optimum operational temperature of 1.8-2.0 K. The current four element array mixer block will ultimately be replaced by a dual polarization slot-ring array configuration with up to eight elements.

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