We present a quasi-static effective medium theory for heterogeneous dielectric mixtures consisting of particles embedded in a host matrix. The model remains valid for all mixture concentrations and can also consider particle shape distributions, thus overcoming the restrictions of previous approaches. The theory is experimentally validated by highly accurate terahertz time domain spectroscopy measurements on three different polymeric compound systems. A comparison with commonly applied theories is given.
ASJC Scopus subject areas
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
- Acoustics and Ultrasonics
- Surfaces, Coatings and Films