Silicon-based vacuum window for millimeter- and submillimeter-wave astrophysics
Applied Optics, vol. 65, pp. 4579
Abstract
We designed, fabricated, and characterized the properties of a silicon-based vacuum window suitable for millimeter-wave astrophysical applications. The window, which has a diameter of 124 mm, an optically usable diameter of 68 mm, and a thickness of about 4 mm, gives an average transmittance and reflectance of 99.6±3.5% and 1.3±1.4% , respectively, a fractional bandwidth of 67%, centered at 300 GHz. Absorptive loss is below the detection limit of our measurement. The anti-reflection coating is made with laser-ablated sub-wavelength structures (SWS), and the measured transmittance and reflectance values agree with the modeling based on the measured SWS shapes. The window has been integrated into DESHIMA 2.0, an astrophysics instrument that took year-long observations with the Atacama Submillimeter Telescope Experiment.
Authors 10
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Affiliation as printed
University of Minnesota
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Affiliation as printed
The University of Tokyo
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Delft University of Technology
Affiliation as printed
Delft University of Technology
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Affiliation as printed
University of Minnesota
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Space Research Organisation Netherlands
Affiliation as printed
Netherlands Institute for Space Research (SRON)
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Affiliation as printed
Laser Zentrum Hannover
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Affiliation as printed
The University of Tokyo
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Kavli Institute for the Physics and Mathematics of the Universe · Institute of Space and Astronautical Science · International Laboratory for Astrophysics, Neutrino and Cosmology Experiments
Affiliation as printed
Center for Data Driven Discovery (CD3), Kavli Institute for the Physics and Mathematics of the Universe (IPMU)
ILANCE
Institute of Space and Astronautical Science (ISAS)
Kavli Institute for the Physics and Mathematics of the Universe (WPI)
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Affiliation as printed
The University of Tokyo
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