Planar silicon metamaterial lenslet arrays for millimeter-wavelength imaging

Christopher M. McKenney; Jason E. Austermann; James A. Beall; Nils W. Halverson; Johannes Hubmayr; Gregory Jaehnig; Giampaolo Pisano; Sarah A. Stevenson; Aritoki Suzuki; Jonathan A. Thompson

doi:10.1117/12.2565532

13 December 2020 Planar silicon metamaterial lenslet arrays for millimeter-wavelength imaging

Christopher M. McKenney, Jason E. Austermann, James A. Beall, Nils W. Halverson, Johannes Hubmayr, Gregory Jaehnig, Giampaolo Pisano, Sarah A. Stevenson, Aritoki Suzuki, Jonathan A. Thompson

Author Affiliations +

Proceedings Volume 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X; 1145306 (2020) https://doi.org/10.1117/12.2565532
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

We are developing planar lenslet arrays for millimeter-wavelength imaging using metamaterials microlithically fabricated using silicon wafers. We describe the design process for a gradient-index (GRIN) metamaterial lenslet using metal-mesh patterned on silicon and a combination of metal-mesh and etched-hole metamaterial anti-reflection layers. We optimize the design using a bulk-material model to rapidly simulate and iterate on the lenslet design. We fabricated prototype GRIN metamaterial lenslet array and mounted it on a Polarbear/Simons Array 90/150 GHz band transition edge sensor (TES) bolometer detector array with sinuous planar antennas. Beam measurements of a prototype lenslet array agree reasonably well with the model simulations. We plan to further optimize the design and combine it with a broadband anti-reflection coating to achieve operation over 70–350 GHz bandwidth. Applications include measurements of the Cosmic Microwave Background (CMB) and sub millimeter astrophysics.

Conference Presentation

Citation Download Citation

Christopher M. McKenney, Jason E. Austermann, James A. Beall, Nils W. Halverson, Johannes Hubmayr, Gregory Jaehnig, Giampaolo Pisano, Sarah A. Stevenson, Aritoki Suzuki, and Jonathan A. Thompson "Planar silicon metamaterial lenslet arrays for millimeter-wavelength imaging", Proc. SPIE 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X, 1145306 (13 December 2020); https://doi.org/10.1117/12.2565532

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