3D structured Bessel beam polarization and its application to imprint chiral optical properties in silica

Jiafeng Lu; Mostafa Hassan; Francois Courvoisier; Enrique Garcia-Caurel; Francois Brisset; Razvigor Ossikovski; Xianglong Zeng; Bertrand Poumellec; Matthieu Lancry

arXiv · 2303.10198

3D structured Bessel beam polarization and its application to imprint chiral optical properties in silica

Jiafeng Lu·Mostafa Hassan·Francois Courvoisier·Enrique Garcia-Caurel·Francois Brisset·Razvigor Ossikovski·Xianglong Zeng·Bertrand Poumellec·Matthieu Lancry

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Abstract

Polarization plays crucial role in light-matter interactions; hence its overall manipulation is an essential key to unlock the versatility of light manufacturing, especially in femtosecond laser direct writing. Existing polarization-shaping techniques, however, only focus on the manipulation in transverse plane of a light beam, namely a two-dimensional control. In this paper, we propose a novel passive strategy that exploits a class of femtosecond laser written space varying birefringent elements, to shape the polarization state along the optical path. As a demonstration, we generate a three-dimensional structured Bessel beam whose linear polarization state is slowly evolving along the focus (typ. 90 degrees within 60 lightwave periods). Such a "helical polarized" Bessel beam allows imprinting "twisted nanogratings" in SiO2 resulting in an extrinsic optical chirality at a micrometric scale, which owns a high optical rotation. Our work brings new perspectives for three-dimensional polarization manipulations and would find applications in structured light, light-matter interaction and chiral device fabrication.

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Jiafeng Lu, Mostafa Hassan, Francois Courvoisier, Enrique Garcia-Caurel, Francois Brisset, Razvigor Ossikovski, Xianglong Zeng, Bertrand Poumellec, Matthieu Lancry. 2023-03-17. 3D structured Bessel beam polarization and its application to imprint chiral optical properties in silica. https://arxiv.org/abs/2303.10198

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