Izvestiya of Saratov University.
ISSN 1817-3020 (Print)
ISSN 2542-193X (Online)


дисперсия

Dispersion Characteristic Calculation of Photonic Crystal Fiber Guided Modes

Dispersion characteristic of photonic crystal fiber guided mode is calculated. Numerical modeling based on the Maxwell equation for magnetic components for field of the photonic crystal is obtained. It is shown, that slot photonics crystal waveguides can be used to tailor dispersion.

Reception of Ultrashort Radio Pulses Propagating in a Dispersion Medium

Signal spectrum detection algorithm of ultrashort radio pulses sequence propagating in a dispersion medium is developed. Technical implementation of detection device is considered.

Why the Refractive Index Couldn't Be Negative

It had been shown that for left-handed metamaterials and generally for negative refraction media the refraction index could not be introduced uniformly and could not be considered as real, especially as negative. This index for above referred media is not expedient.

The Perspective Slow-wave Systems of Terahertz Band for TWT

In this paper the review of terahertz perspective slow-wave systems is presented for TWT. The methods of modeling have been considered and some numerical results are presented.

Parametric Gain Calculation in Photonic Crystal Fiber

Signal wave parametric gain was calculated in photonic crystal optical fiber. Photonic crystal fiber structure was optimized for broadband parametric gain. It is shown, that gain bandwidth for photonic-crystal fiber optical parametric amplifier could be more than 400 nm. Spectral changings in parametric gain due to modulation of photonic crystal waveguide cross-section was studied.

Integral Equations for Photonic Crystal Fibers

The integral and integrodifferential equations for photonic crystal waveguides (fibers) have been obtained both for finite and infinite dimensions of quasiperiodic dielectric coverings. Previously the equations for two-dimensional periodic photonic crystals with magnetodielectric and metallic periodic inclusions have been considered. The corresponding numerical results are presented.