Photonic crystal channel drop filters based on fractal structures

• We propose two new configurations of photonic crystal channel drop filters.
• The structures are based on fractal and quasi-fractal shape resonators.
• Drop efficiency and Q-factor of first filter are 95.86% and 1148.95, respectively.
• For other structure, these parameters are 91.70% and 1078.33, respectively.

In this paper we introduce new configurations of channel drop filters based on two-dimensional photonic crystals. Structures consist of two photonic crystal waveguides and a fractal-shaped resonator between them. The effect of structural parameters on resonance frequency and drop efficiency is investigated. Calculations of band structure and propagation of electromagnetic field through devices are done by plane wave expansion (PWE) and finite difference time domain (FDTD) methods, respectively. In our designs more than 95% drop efficiency with quality factor of ~1150 is achievable at wavelength near 1540 nm, which in comparison with other photonic crystal resonator structures is a very satisfactory and acceptable result.

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