The 12x32 Pop-Up Bolometer Array for the SHARC II Camera

SHARC ll is a 350 _m facility camera for the Caltech Submillimeter Observatory (CSO) expected to come on-line in 2002. The key component of SHARC II is a 12x32 array of doped silicon "pop-up" bolometers developed at NASA/Goddard and delivered to Caltech in March 2002. Each pixel is 1 mm × 1 ram, coated with a 400 D/square bismuth film, and located _,/4 above a reflective backshort to maximize radiation absorption. The pixels cover the focal plane with >95% filling factor. Each doped thermistor occupies nearly the full area of the pixel to minimize l/f noise. We report some results from the first cold measurements of this array. The bolometers were located inside a dark cover, and 4×32 pixels were read simultaneously. In the best 25% of winter nights on Mauna Kea, SHARC 11 is expected to have an NEFD at 350 lam of 1 Jy s _'2or better.

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