Highly tunable elastic dielectric metasurface lenses

Journal Article · Thu Nov 03 00:00:00 EDT 2016 · Laser & Photonics Reviews

DOI:https://doi.org/10.1002/lpor.201600144· OSTI ID:1401025

Kamali, Seyedeh Mahsa ^[1]; Arbabi, Ehsan ^[1]; Arbabi, Amir ^[1]; Horie, Yu ^[1]; Faraon, Andrei ^[1]

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1. T. J. Watson Laboratory of Applied Physics and Kavli Nanoscience Institute California Institute of Technology, 1200 E California Blvd Pasadena CA 91125 USA

Abstract Dielectric metasurfaces are two‐dimensional structures composed of nano‐scatterers that manipulate the phase and polarization of optical waves with subwavelength spatial resolution, thus enabling ultra‐thin components for free‐space optics. While high performance devices with various functionalities, including some that are difficult to achieve using conventional optical setups have been shown, most demonstrated components have fixed parameters. Here, we demonstrate highly tunable dielectric metasurface devices based on subwavelength thick silicon nano‐posts encapsulated in a thin transparent elastic polymer. As proof of concept, we demonstrate a metasurface microlens operating at 915 nm, with focal distance tuning from 600 μm to 1400 μm (over 952 diopters change in optical power) through radial strain, while maintaining a diffraction limited focus and a focusing efficiency above 50%. The demonstrated tunable metasurface concept is highly versatile for developing ultra‐slim, multi‐functional and tunable optical devices with widespread applications ranging from consumer electronics to medical devices and optical communications. image

• Sponsoring Organization: USDOE
• OSTI ID: 1401025
• Journal Information: Laser & Photonics Reviews, Journal Name: Laser & Photonics Reviews Vol. 10 Journal Issue: 6; ISSN 1863-8880
• Publisher: Wiley Blackwell (John Wiley & Sons)
• Country of Publication: Germany
• Language: English