Dielectric (impedance) spectroscopy of liquid crystals is a powerful experimental technique. It especially essential because in many applications are still controlled by the electric field. In this paper, problems with high frequency (>1 MHz) measurements classical (in shape flat capacitor) measuring cells discussed. The procedure for overcoming measurement difficulties was presented and applie...

We study one- and two-dimensional transmission of electromagnetic waves through a finite slab of a dielectric material with negative refraction. In the case when the dielectric slab possesses an intensitydependent nonlinear response, we observe the nonlinearity-induced wave transmission through an opaque slab accompanied by the generation of spatiotemporal solitons. We solve this problem numeri...

Optical dispersion spectra at energies up to 30 eV play a vital role in understanding the chiralitydependent van der Waals–London dispersion interactions of single wall carbon nanotubes (SWCNTs). We use one-electron theory based calculations to obtain the band structures and the frequency dependent dielectric response function from 0–30 eV for 64 SWCNTs differing in radius, electronic structure...

The dielectric susceptibility of most materials follows a fractional power-law frequency dependence that is called the ”universal” response. We prove that in the time domain this dependence gives differential equations with derivatives and integrals of noninteger order. We obtain equations that describe ”universal” Curie-von Schweidler and Gauss laws for such dielectric materials. These laws ar...

We present an algorithm to calculate the linear response of periodic systems in the time-dependent density functional theory, using a real-space representation of the electron wave functions and calculating the dynamics in real time. The real-space formulation increases the efficiency for calculating the interaction, and the real-time treatment decreases storage requirements and allows the enti...

The most common types of molecule geometries that have been considered in the past for artificial dielectric materials include simple dipoles and spheres. In this article we consider a fractal approach, combining aspects of both the dipole and sphere, resulting in an inclusion with a greater number of resonances as well as resonant behavior at lower frequencies than either their dipole or spher...

The frequency-dependent nonlinear dielectric increment of dipolar fluids in nonpolar fluids is often measured by using a stationary relaxation method in which two electric fields are used: The static direct current (dc) field of high strength causing the dielectric nonlinearity, and the probing alternating current (ac) field of low strength and high frequency. When a nonlinear composite is subj...

Knowledge of the dielectric properties of commodities and insect pests is important in developing thermal treatments for postharvest insect control based on radio frequency (RF) and microwave energy. The dielectric properties of six subtropical and tropical fruits along with four associated insect pests were measured between 1 and 1800 MHz using an open-ended coaxial-line probe technique and at...

A novel fit function for the complex frequency dependent dielectric susceptibility is introduced and compared against other fit functions for experimental broadband dielectric loss spectra of propylene carbonate from Schneider et al. Phys.Rev.E, 59 (1999), 6924. The fitting function contains a single stretching exponent similar to the familiar Cole-Davidson or Kohlrausch fits. It is compared to...

Dielectric measurements of lanthanum modified lead titanate ceramics were carried out in a frequency and temperature range of 70 × 10 Hz – 2 × 10 Hz and 300 K 420 K, respectively. Dielectric relaxation appears around 7 × 10 Hz at room temperature, and the maximum of the dielectric relaxation was around 393 K, the transition temperature (T c ). The relaxation frequency passes through a minimum a...