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Spontaneously formed temperature-frequency zone of negative dielectric permittivity ε′<0 was found in polymer-water system “poly(acylic acid)+3wt% of moisture”. Nucleation and evolution of the zone is demonstrated on ε′(f,T), ε″(f,T) and tgδ(f,T) 3D plots. Bound water release at T>65°C is thought to be the reason of this phenomenon. The frequency width of the zone steadily increases with temperature...
Damping of the polar vibrations determines the real limits of negative dielectric permittivity (DP) region as shown in this work. We obtain the simple quantitative criterion for the negative DP existence in the single oscillatory approximation model. We introduce this criterion as inequality between the damping constant and T-L frequency splitting of the polar phonon. This inequality is the sufficient...
Terahertz anomalous dispersion and material physical properties leads to form the region with negative dielectric permittivity (DP) that is created around the polar frequency oscillations in three crystalline modifications of boron nitride will be analyzed in our report. Our analysis based on the simple quantitative criterion of existence the negative DP bands. Seven vibrations in different crystalline...
We investigated electrodynamics of structures incorporating composites with negative dielectric permittivity and magnetic permeability, the popular ??left-handed metamaterials??. We obtained the exact analytical solutions to the Helmholtz equation for gradient-index interfaces between the positive and negative index part in the special case of matched impedances of the two materials. We derived expressions...
We investigate the electrodynamics of structures incorporating nanocomposites with negative dielectric permittivity and magnetic permeability, the popular “left-handed metamaterials”. We obtain analytical solutions to the Helmholtz equation for gradient-index interfaces between the positive and negative index part. We derive expressions for the field intensity as well as for the transmission- and...
We investigated THz surface polariton plasmon resonance of a left-handed material which has negative dielectric permittivity and negative magnetic permeability. We found that there are two bands of surface plasmon excited by p-polarized wave and, very interestingly, there is one band of surface polariton, magnetic surface polariton, excited by s polarized wave from the simulated reflection spectra...
In this work, we study the effect of weak disorder in the split-ring resonators parameters on the magnetic response of the composite structures and the existence of the frequency domain where the composite material exhibits the specific left-handed properties such as negative refraction. Composite materials are created by arrays of wires and split- ring resonators,and they are known to possess a negative...
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