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Design and experimental investigation of a planar metamaterial Silicon based lenslet

Gascard, Thomas, Pisano, Giampaolo ORCID:, Doyle, Simon ORCID:, Shitvov, Alexey, Austermann, Jason, Beall, James, Hubmayr, Johannes, Raymind, Benjamin, Halverson, Nils, Jaehnig, Gregory, McKenney, Christopher and Suzuki, Aritoki 2021. Design and experimental investigation of a planar metamaterial Silicon based lenslet. Presented at: SPIE Astronomical Telescopes + Instrumentation 2020, Virtual, 14-18 December 2020. Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X. Proceedings of SPIE. , vol.11453 California, United States: Society of Photo-optical Instrumentation Engineers (SPIE), p. 1145307. 10.1117/12.2562692

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The next generations of ground-based cosmic microwave background experiments will require polarisation sensitive, multichroic pixels of large focal planes comprising several thousand detectors operating at the photon noise limit. One approach to achieve this goal is to couple light from the telescope to a polarisation sensitive antenna structure connected to a superconducting diplexer network where the desired frequency bands are filtered before being fed to individual ultra-sensitive detectors such as Transition Edge Sensors. Traditionally, arrays constituted of horn antennas, planar phased antennas or anti-reflection coated micro-lenses have been placed in front of planar antenna structures to achieve the gain required to couple efficiently to the telescope optics. In this paper are presented the design concept and a preliminary analysis of the measured performances of a phase-engineered metamaterial flat-lenslet. The flat lens design is inherently matched to free space, avoiding the necessity of an anti-reflection coating layer. It can be fabricated lithographically, making scaling to large format arrays relatively simple. Furthermore, this technology is compatible with the fabrication process required for the production of large-format lumped element kinetic inductance detector arrays which have already demonstrated the required sensitivity along with multiplexing ratios of order 1000 detectors/channel.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > Q Science (General)
Q Science > QB Astronomy
Q Science > QC Physics
Publisher: Society of Photo-optical Instrumentation Engineers (SPIE)
ISSN: 0277-786X
Funders: Science and Technology Facilities Council [grant number ST/S00033X/1], NASA under grant/cooperative agreement number NNX17AE85G
Date of First Compliant Deposit: 4 May 2021
Date of Acceptance: 13 December 2020
Last Modified: 28 Nov 2022 12:37

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