Transforming Unidirectional Edge Waveguide Into Unidirectional Air Waveguide

A unidirectional waveguide plays the key role in optical communication system. The unidirectional edge modes in two-dimensional magneto-optical photonic crystals have a unique feature because they are robust against imperfections or disruptions along the edge, but they can hardly form an optical beam. In order to obtain a unidirectional air waveguide, we have studied the coupling effect of two unidirectional edge modes basing on band calculations and numerical simulations. With a waveguide width of 1.5a, an ideal unidirectional air waveguide is achieved. The unidirectional air waveguide has great performance because of its broad working bandwidth, high extinction ratio, single-mode feature, and air waveguide configuration. It has an advantage over the unidirectional edge waveguide because it can focus the wave energy and form a one-way beam. An analytical analysis is also given for the results.

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