Equal point of two modes effective refractive indices in simplified modal method

Yuda Chen; Changhe Zhou; Yihan Wang; Wei Jia; Jin Wang

doi:10.1117/12.3036346

22 November 2024 Equal point of two modes effective refractive indices in simplified modal method

Yuda Chen, Changhe Zhou, Yihan Wang, Wei Jia, Jin Wang

Proceedings Volume 13240, Holography, Diffractive Optics, and Applications XIV; 132401S (2024) https://doi.org/10.1117/12.3036346
Event: SPIE/COS Photonics Asia, 2024, Nantong, Jiangsu, China

Abstract

The simplified mode method explains the physical processes inside the grating in terms of the Mach- Zehnder interferometer model. There are three modes include mode 0, 1, 2 in grating under second Bragg angle incidence. We report a special case of fused silica grating when its period is close to 1.3 times of wavelength, where the effective refractive index of mode 1 might be equal to mode 2. In this special case, we found that the joint effect of mode 1 and 2 on the diffraction efficiency for -2 order is not accurate entirely, and the diffraction of the 0th order is approaching to the maximum, both with a slight oscillation of efficiency when the depth of grating is increased. This phenomenon by using simplified mode method could help to understand the physics of grating theory.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yuda Chen, Changhe Zhou, Yihan Wang, Wei Jia, and Jin Wang "Equal point of two modes effective refractive indices in simplified modal method", Proc. SPIE 13240, Holography, Diffractive Optics, and Applications XIV, 132401S (22 November 2024); https://doi.org/10.1117/12.3036346

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