Abstract
In this work a very simple all-optical isolator, based on 2D holes in slab Photonic Crystal (PhC) waveguide, has been proposed and its performance has been investigated by Finite-Difference Time-Domain (FDTD) method. The unidirectional characteristic of the waveguide is phase independent in nature and no extra bias signal has been used. The structure is basically a ‘W1’ pyramid shaped waveguide having a 120° -bend in it and the unidirectional property has been achieved by making some structural modification in the bend region. This design is capable of providing a high forward transmittance of 72%, very low backward transmission of 10% and high contrast ratio 8.57 dB. Due to its simple structure, small footprint (416μm2), high forward transmission and high contrast ratio altogether make the isolator suitable for upcoming photonic integrated circuits.
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