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

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.
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https://hal-ujm.archives-ouvertes.fr/ujm-03754159
Contributor : Razvan Stoian Connect in order to contact the contributor
Submitted on : Friday, August 19, 2022 - 12:00:04 PM
Last modification on : Sunday, August 21, 2022 - 3:05:46 AM

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Guanghua Cheng, Ling Lin, Konstantin Mishchik, Razvan Stoian. Polarization-Dependent Scattering of Nanogratings in Femtosecond Laser Photowritten Waveguides in Fused Silica. Materials, MDPI, 2022, 15 (16), pp.5698. ⟨10.3390/ma15165698⟩. ⟨ujm-03754159⟩

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