Light refocusing with up-scalable resonant waveguide gratings in confocal prolate spheroid arrangements

Giorgio Quaranta; Guillaume Basset; Zdenek Benes; Olivier J.F. Martin; Benjamin Gallinet

doi:10.1117/1.JNP.12.016004

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25 January 2018 Light refocusing with up-scalable resonant waveguide gratings in confocal prolate spheroid arrangements

Giorgio Quaranta; Guillaume Basset; Zdenek Benes; Olivier J.F. Martin; Benjamin Gallinet

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J. of Nanophotonics, 12(1), 016004 (2018). https://doi.org/10.1117/1.JNP.12.016004

Abstract

Resonant waveguide gratings (RWGs) are thin-film structures, where coupled modes interfere with the diffracted incoming wave and produce strong angular and spectral filtering. The combination of two finite-length and impedance matched RWGs allows the creation of a passive beam steering element, which is compatible with up-scalable fabrication processes. Here, we propose a design method to create large patterns of such elements able to filter, steer, and focus the light from one point source to another. The method is based on ellipsoidal mirrors to choose a system of confocal prolate spheroids where the two focal points are the source point and observation point, respectively. It allows finding the proper orientation and position of each RWG element of the pattern, such that the phase is constructively preserved at the observation point. The design techniques presented here could be implemented in a variety of systems, where large-scale patterns are needed, such as optical security, multifocal or monochromatic lenses, biosensors, and see-through optical combiners for near-eye displays.

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Giorgio Quaranta, Guillaume Basset, Zdenek Benes, Olivier J.F. Martin, and Benjamin Gallinet "Light refocusing with up-scalable resonant waveguide gratings in confocal prolate spheroid arrangements," Journal of Nanophotonics 12(1), 016004 (25 January 2018). https://doi.org/10.1117/1.JNP.12.016004

Received: 26 October 2017; Accepted: 4 January 2018; Published: 25 January 2018

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