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

Dowell, C. D.; Allen, Christine A.; Babu, R. Sachidananda; Freund, Minoru M.; Gardner, M.; Groseth, Jeff; Jhabvala, M.; Kovács, A.; Lis, D. C.; Moseley, S. H.; Phillips, T. G.; Silverberg, R. F.; Voellmer, George M.; Yoshida, Hiroshige

doi:10.1117/12.459360

Cited by 120 publications

(34 citation statements)

References 19 publications

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“…49(a) [186]. This array construction, with 12´32 pixels, involves a pop−up configu− ration, where the absorber is deposited on a dielectric film that is subsequently folded.…”

Section: Semiconductor Bolometersmentioning

confidence: 99%

Terahertz detectors and focal plane arrays

Rogalski

Сизов

2011

Opto-Electronics Review

318

225

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Terahertz (THz) technology is one of emerging technologies that will change our life. A lot of attractive applications in security, medicine, biology, astronomy, and non-destructive materials testing have been demonstrated already. However, the realization of THz emitters and receivers is a challenge because the frequencies are too high for conventional electronics and the photon energies are too small for classical optics. As a result, THz radiation is resistant to the techniques commonly employed in these well established neighbouring bands.In the paper, issues associated with the development and exploitation of THz radiation detectors and focal plane arrays are discussed. Historical impressive progress in THz detector sensitivity in a period of more than half century is analyzed. More attention is put on the basic physical phenomena and the recent progress in both direct and heterodyne detectors. After short description of general classification of THz detectors, more details concern Schottky barrier diodes, pair braking detectors, hot electron mixers and field-effect transistor detectors, where links between THz devices and modern technologies such as micromachining are underlined. Also, the operational conditions of THz detectors and their upper performance limits are reviewed. Finally, recent advances in novel nanoelectronic materials and technologies are described. It is expected that applications of nanoscale materials and devices will open the door for further performance improvement in THz detectors.

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“…49(a) [186]. This array construction, with 12´32 pixels, involves a pop−up configu− ration, where the absorber is deposited on a dielectric film that is subsequently folded.…”

Section: Semiconductor Bolometersmentioning

confidence: 99%

Terahertz detectors and focal plane arrays

Rogalski

Сизов

2011

Opto-Electronics Review

318

225

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“…Observations at 350 μm were made on two occasions with the second-generation Submillimeter High Angular Resolution Camera (SHARC II; Dowell et al 2003) at the CSO on 2006 July 7 and September 1, respectively. On each occasion, eight scans of 4 minute duration were obtained, covering a rectangular area of 3.…”

Section: Cso Observationsmentioning

confidence: 99%

A Massive Protostar Embedded in the Scuba Core JCMT 18354-0649s

Zhu

Davis

et al. 2011

ApJ

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We report the discovery of an extremely red object embedded in the massive SCUBA core JCMT 18354-0649S. This object is not associated with any known radio or far-IR source, though it appears in Spitzer IRAC data obtained as part of the GLIMPSE survey. At shorter wavelengths, this embedded source exhibits an extreme color, K − L = 6.7. At an assumed distance of 5.7 kpc, this source has a near-IR luminosity of ∼1000 L . Its spectral energy distribution (SED) rises sharply from 2.1 μm to 8 μm, similar to that of a Class 0 young stellar object. Theoretical modeling of the SED indicates that the central star has a mass of 6-12 M , with an optical extinction of more than 30. As both inflow and outflow motions are present in JCMT 18354-0649S, we suggest that this deeply embedded source is (1) a massive protostar in the early stages of accretion, and (2) the driving source of a massive molecular outflow evident in HCN J = 3-2 profiles observed toward this region.

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“…SHARP is a foreoptics module that converts the CSO's Submillimeter High Angular Resolution Camera generation II (SHARC-II) [22] into a dual-beam polarimeter. As shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Design and initial performance of SHARP, a polarimeter for the SHARC-II camera at the Caltech Submillimeter Observatory

Li¹,

Dowell²,

Kirby³

et al. 2008

Appl. Opt.

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We have developed a foreoptics module that converts the Submillimeter High Angular Resolution Camera generation II (SHARC-II) camera at the Caltech Submillimeter Observatory into a sensitive imaging polarimeter at wavelengths of 350 and 450 m. We refer to this module as "SHARP." SHARP splits the incident radiation into two orthogonally polarized beams that are then reimaged onto opposite ends of the 32 ϫ 12 pixel detector array in SHARC-II. A rotating half-wave plate is used just upstream from the polarization-splitting optics. The effect of SHARP is to convert SHARC-II into a dual-beam 12 ϫ 12 pixel polarimeter. A novel feature of SHARP's design is the use of a crossed grid in a submillimeter polarimeter. Here we describe the detailed optical design of SHARP and present results of tests carried out during our first few observing runs. At 350 m, the beam size (9 arc sec), throughput (75%), and instrumental polarization ͑Ͻ1%͒ are all very close to our design goals.

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

Cited by 120 publications

References 19 publications

Terahertz detectors and focal plane arrays

Terahertz detectors and focal plane arrays

A Massive Protostar Embedded in the Scuba Core JCMT 18354-0649s

Design and initial performance of SHARP, a polarimeter for the SHARC-II camera at the Caltech Submillimeter Observatory

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