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- W2767202210 abstract "Antenna-Coupled Arrays of Voltage-Biased Superconducting Bolometers Michael J. Myers 1,4 , Adrian T. Lee 1,2 , P. L. Richards 1,3,4 D. Schwan 1,4 , J. T. Skidmore 1,4 , A. D. Smith 5 , Helmuth Spieler 2 , Jongsoo Yoon 1,4 Department of Physics, University of California, Berkeley, CA 94720 Physics Division, Lawrence Berkeley National Laboratory Berkeley, CA 94720 Material Science Division Lawrence Berkeley National Laboratory, Berkeley, CA, 94720 Space Sciences Laboratory University of California, Berkeley, CA 94720 TRW Inc. One Space Park, Redondo Beach, CA 90278 Abstract. We report on the development of antenna-coupled Voltage-biased Superconducting Bolometers (VSBs) which use Transition-edge Sensors (TES). Antenna coupling can greatly simplify the fabrication of large multi-frequency bolometer arrays compared to horn-coupled techniques. This simplification can make it practical to implement 1000+ element arrays that fill the focal plane of mm/sub-mm wave telescopes. We have designed a prototype device with a double-slot dipole antenna, integrated band-defining filters, and a membrane-suspended bolometer. A test chip has been constructed and will be tested shortly. INTRODUCTION The 200µm to 3mm wavelength range has great astronomical and cosmological significance. Science goals include characterization of the cosmic microwave background, measurement of the Sunyaev-Zel'dovich effect in galaxy clusters[1], and observations of forming galaxies[2]. Cryogenic bolometers are the most sensitive broadband detectors in this frequency range. Because single bolometer pixels are reaching the photon-noise limit for many observations, the development of large arrays will be critical for future science progress. Voltage-biased superconducting bolometers (VSBs) which use a Transition-Edge Sensor (TES) have several advantages compared to other cryogenic bolometers. Their strong negative electrothermal feedback enhances their linearity, speed, and stability. The large noise margin of the SQUID readout enables multiplexed readout schemes, which are necessary for developing large arrays. In this paper, we discuss the development of antenna-coupled VSBs. A planar antenna can be used to couple optical power into a bolometer. This approach offers many advantages in building a large integrated array of detectors. The antenna pattern is used to control the solid angle visible to the bolometer as with a horn antenna, but planar antennas are much simpler to fabricate in large numbers than scalar horns. The antennas, band-defining filters, and bolometers can all be integrated onto a single substrate, which will greatly simplify fabrication" @default.
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- W2767202210 date "2001-07-23" @default.
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- W2767202210 title "Antenna-coupled arrays of voltage-biased superconducting bolometers - eScholarship" @default.
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