Microwave Magnetic Solitons in Ferrite Films - Physics and Devices for Radar, Electronic Countermeasures, and Surveillance.

摘要

The program has: (1) developed prototype microwave soliton delay line devices; (2) developed new device concepts based on the phase and velocity characteristics of solitons; and (3) applied Brillouin light scattering techniques to soliton characterization. New types of solitons, in the form of 'dark' surface wave solitons and backward volume wave solitons for in-plane magnetized yttrium iron garnet (YIG) films, were generated, detected, and modeled. Soliton formation, propagation, decay, reflection and collision properties were measured and modeled on the basis of the one dimensional nonlinear Schrodinger equation. Parametric pumping and feedback techniques were developed to amplify solitons and self generate eigenmode soliton signals. Brillouin light scattering (ELS) experiments were able to sample directly the wave vector make-up of the soliton signals. Soliton pumped spin waves were also observed and analyzed by the BLS technique. In addition, (1) time and space resolved capability has been added to the ELS system; (2) a new space and time resolved inductive magnetodynamic probe (IMP) technique has been developed and applied to the characterization of soliton delay line devices; and (3) a new frequency filtering technique has been used to self generate trains of both bright and dark solitons and produce a phase locked frequency comb.