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Expandable fully reflective focal-plane optics for millimeter- and submillimeter-wave array receivers

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5 Author(s)
Luthi, T. ; KOSMA, I. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany ; Rabanus, D. ; Graf, U.U. ; Granet, C.
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We describe a focal-plane optics for millimeter- and submillimeter-wave array receivers which are both fully reflective—thus avoiding the absorption and reflection losses of dielectric lenses—and expandable to an arbitrary number of pixels. The optics unit cell consists of two mirrors and a feedhorn optimized for near-field operation. Employing an integrated optics approach the mirror setup consists of only three mechanical parts, independent of the number of pixels, and requires no internal optical alignment. With a 345 GHz 3×3-beam prototype a Gaussicity of ≥98% and a focal-plane beam separation of 3.6 waist radii was obtained. In this article we present the optics design as well as numerical simulations and measured beam patterns.

Published in:

Review of Scientific Instruments  (Volume:77 ,  Issue: 1 )

Date of Publication:

Jan 2006

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