Vortex Supported Waveguiding in Microstructured Optical Fibers

In this paper, we propose a mechanism of vortex formation in the transverse components of the Poynting vector of the core modes in different types of optical fibers. It is shown that vortex formation in the transverse component of the Poynting vector occurs when real and imaginary parts of axial components of electric and magnetic fields of the core modes exist and are equal to zero at the same point of the fiber cross section. Another explanation of vortex formation can be mutual polarization of the fields (vector product). We demonstrate that it is possible to achieve a low loss waveguide regime in microstructured optical fibers by appropriately choosing phase dislocations positions in the cladding.