Broadband Quasi-Optical System for On-chip Filter-bank Spectrometer Operating at Sub-mm Wavelengths [VIDEO]
Shahab Dabironezare (TU Delft - Tera-Hertz Sensing)
K. Karatsu (TU Delft - Tera-Hertz Sensing)
S.J.C. Yates (SRON–Netherlands Institute for Space Research)
Alejandro Pascual Laguna (TU Delft - Tera-Hertz Sensing)
Vignesh Murugesan (SRON–Netherlands Institute for Space Research)
David J. Thoen (TU Delft - Tera-Hertz Sensing)
A Endo (TU Delft - Tera-Hertz Sensing)
Jochem Baselmans (TU Delft - Tera-Hertz Sensing)
Nuria Llombart (TU Delft - Tera-Hertz Sensing)
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Abstract
DESHIMA 2.0 is a sub-millimetre wave spectrometer based on a single superconducting chip with a large instantaneous bandwidth. The instrument consists of a Quasi-optical (QO) system and an on-chip filter-bank coupled to an array of Kinetic Inductance Detectors (KID). In this work, this broad band QO system, operating at sub-millimetre wavelengths (220 GHz to 720 GHz), will be presented. This design is achieved using a field matching technique and consists of a hyper-hemispherical leaky lens antenna coupled to a series of Dragonian reflectors. The optimized design has an average illumination efficiency over the band of ~70%. This performance is also measured directly through the response of the KIDs.
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