Modeling and optimization of bi-stable optical switch

High performance silicon-based, micro-optical switch are being developed for application to optical networks. The mechanical part was fabricated in a one-level mask step by bulk micromachining of (100) monocrystalline silicon with KOH. The resulting structure was assembled with a 100mum-thick Permalloy piece and then, it was associated to a small magnetic circuit for its electromagnetic actuation. In order to avoid power consumption during ON and OFF states, a bi-stable operation principle is proposed. The bi-stable behavior is obtained thanks to a stable mechanical position due to the cantilever stiffness and a second magnetic stable position due to a magnet. Switching operation is provided by electrical currents in windings. The purpose of the present paper is to present a study on modeling and optimization of this system by means of FEM simulations using ANSYS software. Iterative magneto-mechanical simulations are performed. Optimization of dimensions and material properties is presented.