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Proceedings Paper

Steering and filtering white light with resonant waveguide gratings
Author(s): Giorgio Quaranta; Guillaume Basset; Olivier J. F. Martin; Benjamin Gallinet
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Paper Abstract

A novel thin-film single-layer structure based on resonant waveguide gratings (RWGs) allows to engineer selective color filtering and steering of white light. The unit cell of the structure consists of two adjacent finite-length and cross-talking RWGs, where the former acts as in-coupler and the latter acts as out-coupler. The structure is made by only one nano-imprint lithography replication and one thin film layer deposition, making it fully compatible with up-scalable fabrication processes. We characterize a fabricated optical security element designed to work with the flash and the camera of a smartphone in off-axis light steering configuration, where the pattern is revealed only by placing the smartphone in the proper position. Widespread applications are foreseen in a variety of fields, such as multifocal or monochromatic lenses, solar cells, biosensors, security devices and seethrough optical combiners for near-eye displays.

Paper Details

Date Published: 31 August 2017
PDF: 7 pages
Proc. SPIE 10354, Nanoengineering: Fabrication, Properties, Optics, and Devices XIV, 1035408 (31 August 2017); doi: 10.1117/12.2272683
Show Author Affiliations
Giorgio Quaranta, Ctr. Suisse d'Electronique et de Microtechnique SA (Switzerland)
Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Guillaume Basset, Ctr. Suisse d'Electronique et de Microtechnique SA (Switzerland)
Olivier J. F. Martin, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Benjamin Gallinet, Ctr. Suisse d'Electronique et de Microtechnique SA (Switzerland)


Published in SPIE Proceedings Vol. 10354:
Nanoengineering: Fabrication, Properties, Optics, and Devices XIV
Eva M. Campo; Elizabeth A. Dobisz; Louay A. Eldada, Editor(s)

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