Investigation of Electromagnetic Properties of Multiparticle Systems in the Optical and Microwave Regions

The goal of this work is to examine the electromagnetic properties of multiple particles ensembles in optical and microwave regions. Electromagnetic scattering problems of multi-particles systems appear in many research areas, including biomedical research problems. When a particle system becomes dense, multiple scattering between the particles need to be included in order to fully describe the response of the system to an EM wave. The generalized multiparticle Mie (GMM) solution is used to rigorously solve the Maxwell's equations for multi-particles systems. The algorithm accounts for multiple scattering effects by transforming the waves scattered by an individual particle to the incident waves of other spheres in the ensemble.;In the optical region, light scattering from biological tissues can reveal structural changes in the tissues which can be a mean for disease diagnosis. A new Monte Carlo simulation method is introduced to study the effect of tissue structure on signals from two diagnostic probes, the polarization gating probe and low coherence enhanced back scattering probe (LEBS).;In the microwave region, the study of electromagnetic properties with metallic nanoparticles can determine their potential as effective heating agents in microwave hyperthermia therapy. The investigation aims to study the dielectric properties of metallic nanoparticles and quantify the relationship between the characteristics of metallic nanoparticles and the heating effect. The finding should help optimize the design and use of metallic nanoparticles in hyperthermia treatment. In addition, the metallic nanoparticles are studied for their potential to be contrast agents for biological tissue in the microwave region.