Laguerre-Gaussian quasi-modal q-plates from nanostructured glasses

RAFAYELYAN, Mushegh; GERTUS, Titas; BRASSELET, Etienne

doi:10.1063/1.4990954

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RAFAYELYAN, Mushegh
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

GERTUS, Titas
Altechna R&D Ltd

BRASSELET, Etienne
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Ce document a été publié dans

Applied Physics Letters. 2017, vol. 110, n° 26, p. 261108

American Institute of Physics

Résumé en anglais

A quasi-modal version of the recently introduced Laguerre-Gaussian modal q-plates [Rafayelyan and Brasselet, Opt. Lett. 42, 1966–1969 (2017)] is proposed and implemented using femtosecond direct laser writing of space-variant nanogratings in the bulk of silica glass. The corresponding design consists of linear azimuthal modulation of the optical axis orientation and polynomial radial modulation of the retardance profile. Experimental demonstration is made for Laguerre-Gaussian modes with azimuthal indices l =(1, 2, 3) and radial index p = 0. Such quasi-modal q-plates overcome previous limitations regarding the robustness of modality against the handedness of the incident circular polarization state.< Réduire

DOI

http://dx.doi.org/10.1063/1.4990954

Project ANR

Traitement hyperspectral du moment angulaire orbital de la lumière - ANR-15-CE30-0018

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Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798