Electromagnetic Wave Guidance Mechanisms in Photonic Crystal Fibers
We present the utilization RF module of COMSOL Multiphysics® for understanding three different types of wave guidance mechanisms in photonic crystal fibers (PCFs), like modified total internal reflection, Bragg’s reflection and resonant trapping of defect mode at Dirac frequency. Effective refractive indices of the core and cladding are calculated using mode analysis study to verify total internal reflection in a solid core PCF. The photonic band structure (PBS) of the cladding is calculated using eigen frequency study to identify photonic band gap (PBG) region and Dirac point. PBG guidance is obtained by creating a hollow core. Trapping of Dirac mode is obtained by optimizing the defect radius in such a way that the defect state resonate at the Dirac frequency.
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