Polarization Rotation and Mode Splitting in Photonic Crystal Line-Defect Waveguides

Frontiers in Physics

se²  Debnath, Kapil²  Saito, Shinichi³  Sotto, Moï⁴  Tomita, Isao⁴ 

[1] Computer Engineering, National Institute of Technology, Gifu College, Japan;Computer Science, Faculty of Physical Sciences and Engineering, University of Southampton, United Kingdom;Department of Electrical &Sustainable Electronic Technologies, Department of Electronics &

关键词: silicon photonics;    Polarisation;    Photonic crystal;    Simulations;    band gap;    Slow Light;   

DOI  :  10.3389/fphy.2018.00085

学科分类：物理（综合）

来源: Frontiers

【 摘 要 】

In a line-defect waveguide of a planer photonic crystal (PhC), we found a new rotational state of polarised light, which exhibits `polarisation rotation' on the PhC plane, when a phase mismatch $m$ was added to the air-hole alignment of the waveguide, where mode splitting was simultaneously observed in the dispersion curve. To account for the polarisation rotation together with the mode splitting, we propose a two-state model that is constructed from Schr{\"o}dinger equation obtained from the equation for electromagnetic waves. The proposed two-state model gives an explanation on the relation between the polarisation-rotational angle $\theta$ and the mismatch $m$ and on its rotational direction (i.e., clockwise or anticlockwise direction) that depends on the mode. Using the two-state model, we also discuss the angular momenta of the polarised light in the PhC waveguide, which are directly related to the Stokes parameters that characterise the polarisation rotations.

【 授权许可】

CC BY