Abstract
AbstractIn this paper, an investigation on all-optical direction couplers has been demonstrated. A two-dimensional, holes in slab, photonic crystal structure has been chosen for designing the directional coupler and its working principle is based on linear optics. Moreover, the plane wave expansion and finite difference time domain methods have been employed to analyze the photonic band gap (PBG) and electrical field distribution of the structure, respectively. Different designs of directional couplers have been analyzed like a single waveguide, double waveguide also with obstacle holes in between the waveguides. The outcome of the constructive/destructive interference due to phase difference has also been assessed. Moreover, the impact of variation of hole radius with respect to coupling length and coupled power has also been investigated.KeywordsDirectional couplerPhotonics crystalLinear opticsHole in slabCoupling length
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