Abstract
We present a complete experimental characterization of a quasioptical twin-slot antenna coupled small area (1.0×0.15μm2) NbN hot electron bolometer (HEB) mixer compatible with currently available solid state tunable local oscillator (LO) sources. The required LO power absorbed in the HEB is analyzed in detail and equals only 25nW. Due to the small HEB volume and wide antenna bandwidth, an unwanted direct detection effect is observed which decreases the apparent sensitivity. Correcting for this effect results in a receiver noise temperature of 700K at 1.46THz. The intermediate frequency (IF) gain bandwidth is 2.3GHz and the IF noise bandwidth is 4GHz. The single channel receiver stability is limited to 0.2–0.3s in a 50MHz bandwidth.
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