Dual-Color Antenna-Coupled LEKID for Next-Generation Multi-chroic CMB Focal Planes

We present an antenna-coupled Kinetic Inductance Detector for millimeter wave astronomy. Next-generation telescopes for observing the cosmic microwave background are demanding in terms of number of detectors and focal plane area filling efficiency. Moreover, foreground reduction in B-Mode polarimetr...

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Bibliographic Details
Published in:Journal of low temperature physics 2018-11, Vol.193 (3-4), p.170-175
Main Authors: Traini, Alessandro, Tartari, Andrea, Bordier, Guillaume, Boussaha, Faouzi, Chaumont, Christine, Beldi, Samir, Reix, Florent, Piat, Michel
Format: Article
Language:English
Subjects:
ALUMINIUM
Aluminum
ANTENNAS
Astronomical polarimetry
ASTRONOMY
Astrophysics
Bandpass filters
Characterization and Evaluation of Materials
Condensed Matter Physics
Cosmic microwave background
Coupling
DESIGN
DIELECTRIC MATERIALS
Dual polarization (waves)
EFFICIENCY
ENGINEERING
FILTERS
Focal plane
Frequencies
Inductance
Low temperature physics
Magnetic Materials
Magnetism
Metallizing
Microstrip antennas
MICROWAVE RADIATION
Millimeter waves
Multiplexing
NOISE
Physics
Physics and Astronomy
POLARIMETRY
POLARIZATION
RESONATORS
SIGNALS
Slot antennas
SOLUTIONS
Substrates
TELESCOPES
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Description
Summary:We present an antenna-coupled Kinetic Inductance Detector for millimeter wave astronomy. Next-generation telescopes for observing the cosmic microwave background are demanding in terms of number of detectors and focal plane area filling efficiency. Moreover, foreground reduction in B-Mode polarimetry requires sky observation with multiple frequency bands. In this context, KIDs are a promising technology because of their large multiplexing rate, while antenna coupling can provide multi-band and dual-polarization solutions in compact design. We have developed polarization-sensitive dual-band pixel at 140 and 160 GHz with a bandwidth of almost 8% for each sub-band. The design involves a microstrip-excited slot antenna and two open-stub band-pass filters to direct the signal toward two resonators. These are lumped elements capacitively coupled to the antenna and include an aluminum strip as absorber. The architecture proposed is particularly simple to fabricate, via-less and only involves two metallization levels. The transition does not require any dielectric deposition above the resonator, thus preventing limitations from any source of noise due to a non-monocrystalline substrate. Furthermore, the same coupling technique can be applied to many types of microstrip-excited antennas, which allow to accommodate band-pass filters.
ISSN:0022-2291
1573-7357
DOI:10.1007/s10909-018-2038-5