Development And Application Of An Electromagnetic Pulse Transmission Probe For The Profiling Of Material Charge Centers

The probing of liquid and solid materials and the detection of spatial and temporal charge centers in real time using electromagnetic wave interactions was explored. A microwave pulse source was used to create magnetostatic spin waves using yttrium iron garnet films. The yttrium film was magnetized to saturation within a static magnetic field supporting the propagation of spin-waves. Two transducers were placed over the film to excite and detect spin-wave signals. By probing a material sample placed into the path of the propagating electromagnetic spin-wave pulse, interactions with material charge centers were detected. The electromagnetic pulse transmission probe has been successfully applied to detect solution concentration and polar molecule interactions. Detection and profiling of reaction kinetics, reaction of metal complexes, and specific compounds within solutions is proposed. Phase coherent signal recovery using a modulated microwave source and a phase sensitive detection system is described. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3597821]