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Mesoscopic self-collimation along arbitrary directions and below the light line

Abstract : Self-collimation (SC) and mesoscopic self-collimation (MSC) have been successfully demonstrated along the directions of high symmetry of photonic crystals. Indeed, wide angular acceptances are obtained only in these directions which offer extremely flat isofrequencies. In this article, we numerically demonstrate that mesoscopic self-collimation with large angular acceptance can be achieved along arbitrary directions that are not of high symmetry. In particular, we propose a simple method that allows to easily find all the non-trivial collimation directions and corresponding frequencies. Thanks to the double periodicity of the mesoscopic crystal, these solutions can be effectively tailored in terms of direction and frequency. Moreover, non-trivial MSC solutions can be found well below the light cone. These MSC features open up the possibility of designing complex systems by combining different configurations, such as high reflection (HR) or anti reflection (AR) ones, or active materials.
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https://hal.laas.fr/hal-02308358
Contributor : Olivier Gauthier-Lafaye <>
Submitted on : Tuesday, October 8, 2019 - 2:41:20 PM
Last modification on : Friday, November 20, 2020 - 3:22:32 AM

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Giovanni Magno, Olivier Gauthier-Lafaye, Giovanna Calò, Marco Grande, Vincenzo Petruzzelli, et al.. Mesoscopic self-collimation along arbitrary directions and below the light line. Optics Express, Optical Society of America - OSA Publishing, 2019, 27 (21), pp.30287. ⟨10.1364/OE.27.030287⟩. ⟨hal-02308358⟩

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