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SHARC II is a background-limited 350 µm and 450 µm facility camera for the Caltech Submillimeter Observatory undergoing commissioning in 2002. The key component of SHARC II is a 12×32 array of doped silicon ‘pop-up’ bolometers developed at NASA/Goddard. Each 1 mm,× 1 mm,pixel is coated with a 400 Ω/square bismuth film and located λ/4 above a reflective backshort to achieve >75% absorption efficiency. The pixels cover the focal plane with >90% filling factor. At 350 µm, the SHARC II pixels are separated by 0.65 λ/D. In contrast to the silicon bolometers in the predecessor of SHARC II, each doped thermistor occupies nearly the full area of the pixel, which lowers the 1/f knee of the detector noise to ,1/2 or better. The new camera should be at least 4 times faster at detecting known point sources and 30 times faster at mapping large areas compared to the prior instrument. Keywords: submillimeter, instrumentation, bolometers

SHARC II: a Caltech submillimeter observatory facility camera with 384 pixels