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Focal length adjustable metalenses for zoom imaging
Author(s): Shane A. Colburn; Alan Zhan; Arka Majumdar
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Paper Abstract

Lenses with tunable focal length are crucial to the operation of many optical systems, as in photography, mixed reality, and microscopy. Various technologies exist that support this behavior, but they often entail high power consumption and rely on bulky and expensive optical components. With recent advances in metasurface optics in miniaturizing and augmenting traditional systems, these devices may enable the next generation of varifocal lenses. These devices are flat optical elements comprising arrays of subwavelength-spaced scatterers that can impart spatially varying phase, amplitude, and polarization changes on wavefronts. In recent years, this field has attracted substantial research interest and has produced several demonstrations of focal length adjustable metalenses. These techniques, however, often rely on high control voltages to apply a strain to a flexible substrate or depend on microelectromechanical actuators that require sophisticated fabrication and cannot scale to large area apertures. Here, we discuss our work developing and building a 1 cm aperture Alvarez lens metasurface system with which we demonstrate a focal length tuning range of 6 cm (>200% change) at 1550 nm wavelength. We also design 1 mm Alvarez lens-inspired higher order metasurfaces for full-color imaging when combined with post-capture deconvolution. Using both designs, we demonstrate varifocal zoom imaging.

Paper Details

Date Published: 4 March 2019
PDF: 6 pages
Proc. SPIE 10928, High Contrast Metastructures VIII, 109280E (4 March 2019); doi: 10.1117/12.2510998
Show Author Affiliations
Shane A. Colburn, Univ. of Washington (United States)
Alan Zhan, Univ. of Washington (United States)
Arka Majumdar, Univ. of Washington (United States)

Published in SPIE Proceedings Vol. 10928:
High Contrast Metastructures VIII
Connie J. Chang-Hasnain; Andrei Faraon; Weimin Zhou, Editor(s)

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