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Article Dans Une Revue Optics Letters Année : 2023

Femtosecond laser direct writing multilayer chiral waveplates with minimal linear birefringence

Résumé

Chirality transfer from femtosecond laser direct writing in achiral transparent materials mainly originates from the interplay between anisotropic nanogratings and mechanical stress with non-parallel and non-perpendicular (oblique) neutral axes. Yet, the laser fabrication simultaneously induces non-negligible linear birefringence. For precise manipulation of circular polarization properties, as well as to unlock the full functionality, we report here a geometryinspired multilayer method for direct writing of chiral waveplates with minimal linear birefringence. We perform a theoretical analysis of both circular and linear properties response for different multilayer configurations and achieve strong circular birefringence of up to −2.25 rad with an extinction ratio of circular birefringence to total linear birefringence of up to 5.5 dB at 550 nm. Our strategy enables the precise control of circular properties and provides a facile platform for chiral device exploration with almost no linear property existence.
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Dates et versions

hal-04261093 , version 1 (26-10-2023)

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Jiafeng Lu, Enrique Garcia-Caurel, Razvigor Ossikovski, François Courvoisier, Xianglong Zeng, et al.. Femtosecond laser direct writing multilayer chiral waveplates with minimal linear birefringence. Optics Letters, 2023, 48 (2), pp.271-274. ⟨10.1364/OL.479447⟩. ⟨hal-04261093⟩
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