compact optical key based on 120 degree folding two-dimensional photonic crystal

摘要

Compact optical switch based on 120-degree two-dimensional photonic crystal. The present invention is based on a two-dimensional photonic crystal where defects are inserted which give rise to two waveguides and a resonant cavity. An electromagnetic signal passing through the device is confined within the defects due to the photonic band gap associated with the periodic structure surrounding them. Its main function is to control the flow of an electromagnetic signal along a communications channel, blocking (state off) or admitting (state on) its passage. It also promotes the change in the direction of propagation of an electromagnetic signal by an angle of 120 degrees, providing greater flexibility in the design of integrated optical systems. The working principle of the device is based on the excitation of dipole modes in the resonant cavity of the device according to the application of an external magnetic field dc on the magneto-optical material that constitutes it. In the on and off states the magneto-optical material is magnetized and non-magnetized, respectively.