High frequency Transition Radiation from uniaxial crystal

Focusing of Electromagnetic Wave from Hy- Perbolic Lens into a Uniaxial Crystal with an Arbitrary Orientation of the Optical Axis in the Presence of Aberrations

We derive integral representations suitable for studying the focusing of electromagnetic waves through a symmetrically hyperbolic focusing lens into uniaxial crystal in the presence of cylindrical and coma aberrations using Maslov’s method. The uniaxial crystal used is the negative crystal LiNbO3. Numerical computations are made to obtain the results for focused fields inside negative uniaxial ...

Formation of probing radiation for investigating a uniaxial x-cut crystal with the help of an aperiodic diffractive axicon

The paper presents an experimental study of transformation of a laser beam formed by an aperiodic diffractive axicon (fracxicon) in a lithium niobate x-cut. The beam is shown to undergo astigmatic rhomboidal transformation induced by the crystal birefringence. The output beam intensity distribution is measured at various distances from the crystal. The effects analyzed make it possible to exten...

Ultrahigh Birefringent Photonic Crystal Fiber: An Improved Design

An improved design of Photonic Crystal Fiber with extremely high birefringence and ultralow confinement loss is proposed and analyzed by fullvector finite-element method with uniaxial perfectly matched layers. Numerical results confirm that the proposed structure provides extremely high birefringence (~0.022) and ultralow confinement loss (<0.001dB/km).

The cosmological kibble mechanism in the laboratory: string formation in liquid crystals.

The production of strings (disclination lines and loops) has been observed by means of the Kibble mechanism of domain (bubble) formation in the isotropic-nematic phase transition of the uniaxial nematic liquid crystal 4-cyano-4'-n-pentylbiphenyl. The number of strings formed per bubble is about 0.6. This value is in reasonable agreement with a numerical simulation of the experiment in which the...

Experimental observation of a transition between two uniaxial nematic liquid-crystal phases.