OFF-CHIP DETECTION OF RADIATION FROM A LINEAR-ARRAY OSCILLATOR WITH ASPIRAL ANTENNA

Radiation from a linear array oscillator with a spiral antenna has bee n measured using an off-chip coupled bolometer. The array oscillator h as a distributed array structure with 300 resistively shunted junction s which are placed in the groups of 6 junctions. The array oscillator was fabricated on a Si wafer with a two-arm spiral antenna. The chip w as attached to a Si lens with an anti-reflection coating. Rather large power (> 100 nW) was detected at a number of array bias voltages V-bi as from 115 mV to 196mV, which correspond from 185 GHz to 315GHz. The maximum measured power was 550 nW at V-bias=125 mV (200GHz).