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.
Domaines
Optique [physics.optics]
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