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We report on the development of ARCONS, the ARray Camera for Optical toNear-IR Spectrophotometry. This photon counting integral field unit (IFU),being built at UCSB and Caltech with detectors fabricated at JPL, will use aunique, highly multiplexed low temperature detector technology known asMicrowave Kinetic Inductance Detectors (MKIDs). These detectors, which operateat 100 mK, should provide photon counting with energy resolution of R =E/{\delta}E > 20 and time resolution of a microsecond, with a quantumefficiency of around 50%. We expect to field the instrument at the Palomar 200"telescope in the first quarter of 2011 with an array containing 1024 pixels ina 32x32 pixel form factor to yield a field of view of approximately 10x10arcseconds. The bandwidth of the camera is limited by the rising sky count rateat longer wavelengths, but we anticipate a bandwidth of 0.35 to 1.35 {\mu}mwill be achievable. A simple optical path and compact dewar utilizing acryogen-free adiabatic demagnetization refridgerator (ADR) allows the camera tobe deployed quickly at Naysmith or Coude foci at a variety of telescopes. Ahighly expandable software defined radio (SDR) readout that can scale up tomuch larger arrays has been developed.

ARCONS: A highly multiplexed superconducting optical to near-IR camera