Metasurface-based varifocal Alvarez lens at microwave frequencies

Goldhaber-Gordon, Zev; Tang, Andrew D.; Corbella Bagot, Conrad; Mokim, Mohammad; Silva, Sinhara R.; Cardin, Andrew E.; Azad, Abul K.; Chen, Hou-Tong

doi:10.1364/OE.509837

Metasurface-based varifocal Alvarez lens at microwave frequencies

Journal Article · Thu Jan 04 23:00:00 EST 2024 · Optics Express

DOI:https://doi.org/10.1364/OE.509837· OSTI ID:2278900

Goldhaber-Gordon, Zev; Tang, Andrew D.; ; Mokim, Mohammad; Silva, Sinhara R.; Cardin, Andrew E.; Azad, Abul K.;

Lenses with a tunable focus are highly desirable but remain a challenge. Here, we demonstrate a microwave varifocal meta-lens based on the Alvarez lens principle, consisting of two mechanically movable tri-layer metasurface phase plates with reversed cubic spatial profiles. The manufactured multilayer Alvarez meta-lens enables microwave beam collimation/focusing at frequencies centered at 7.5 GHz, and shows one octave focal length tunability when transversely translating the phase plates by 8 cm. The measurements reveal a gain enhancement up to 15 dB, 3-dB beam width down to 3.5 ^∘ , and relatively broad 3-dB bandwidth of 3 GHz. These advantageous characteristics, along with its simplicity, compactness, and lightweightness, make the demonstrated flat Alvarez meta-lens suitable for deployment in many microwave systems.

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Sponsoring Organization:: USDOE

OSTI ID:: 2278900

Alternate ID(s):: OSTI ID: 2281526

Journal Information:: Optics Express, Journal Name: Optics Express Journal Issue: 2 Vol. 32; ISSN 1094-4087; ISSN OPEXFF

Publisher:: Optical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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