Polarization-Dependent Scattering of Nanogratings in Femtosecond Laser Photowritten Waveguides in Fused Silica

Guanghua Cheng; Ling Lin; Konstantin Mishchik; Razvan Stoian

doi:10.3390/ma15165698

Polarization-Dependent Scattering of Nanogratings in Femtosecond Laser Photowritten Waveguides in Fused Silica

Materials (Basel). 2022 Aug 18;15(16):5698. doi: 10.3390/ma15165698.

Authors

Guanghua Cheng¹, Ling Lin², Konstantin Mishchik³, Razvan Stoian³

Affiliations

¹ School of Artificial Intelligence, Optics and Electronics(iOPEN), Northwestern Polytechnical University, Xi'an 710072, China.
² State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, CAS, Xi'an 710119, China.
³ Laboratoire Hubert Curien, UMR 5516 CNRS, Université Jean Monnet, 42000 Saint Etienne, France.

Abstract

The properties of polarization-selective, light-guiding systems upon subwavelength nanogratings formation in the case of type II refractive index traces induced by femtosecond laser pulses in bulk fused silica were studied. Polarization-dependent scattering is analyzed both in simulation using a finite-difference, time-domain method and in experiments. We argue that the polarization-sensitive optical guiding of type II waveguides is due to polarization-dependent scattering of nanogratings. Optical designs can then be suggested where the guiding efficiency of type I traces can be combined with type II anisotropies. A low-loss waveguide polarizer is demonstrated based on the modulation of the evanescent field emerging from type I waveguides using polarization-dependent scattering of neighboring nanogratings.

Keywords: femtosecond phenomena; polarization-selective devices; waveguides.

Grants and funding

This research was funded by State Key Laboratory Foundation of AVIC Manufacturing Technology Institute, [ant number KQ111501114] and the Agence Nationale de la Recherche, France, [rant number ANR 2011 BS09 026 01].