Hybrid metamaterial lenslet arrays for millimeter and submillimeter imaging

Sarah Stevenson; Jason Austermann; James Beall; Nils Halverson; Johannes Hubmayr; Gregory Jaehnig; Giampaolo Pisano

doi:10.1117/12.3019483

17 August 2024 Hybrid metamaterial lenslet arrays for millimeter and submillimeter imaging

Sarah Stevenson, Jason Austermann, James Beall, Nils Halverson, Johannes Hubmayr, Gregory Jaehnig, Giampaolo Pisano

Author Affiliations +

Proceedings Volume PC13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII; PC131020O (2024) https://doi.org/10.1117/12.3019483
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

We are developing broadband metamaterial planar lenslet arrays for millimeter and submillimeter imaging using stacked silicon wafers patterned with subwavelength copper squares, deep reactive ion etched (DRIE) holes, or a hybrid combination of the two. Beam-forming is accomplished through spatial variation in refractive index within each pixel created by these subwavelength features, a gradient-index (GRIN) design. However, the optical properties of both the metal mesh and DRIE metamaterials exhibit dependence on polarization orientation and wavelength, posing challenges for lens design. We combine metal mesh and DRIE GRIN sections to leverage the contrasting polarization- and frequency-dependent properties of the two material types. Here we present measurements of our most recent prototype metamaterial GRIN lens on sinuous antenna-coupled TES detectors from 88 to 225 GHz. We also present design studies extending to higher frequencies and optimizing for different pixel pitches.

Conference Presentation

Citation Download Citation

Sarah Stevenson, Jason Austermann, James Beall, Nils Halverson, Johannes Hubmayr, Gregory Jaehnig, and Giampaolo Pisano "Hybrid metamaterial lenslet arrays for millimeter and submillimeter imaging", Proc. SPIE PC13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII, PC131020O (17 August 2024); https://doi.org/10.1117/12.3019483

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