Abstract
We would like to continue the discussion of specific features of light leakage in the negative curvature hollow core fibers (NCHCFs). In our previous work, it was shown that consideration of the transverse Poynting vector component of air core modes in the vicinity of core–cladding boundary wall and its streamlines is of great importance for understanding light localization mechanism in NCHCFs. Using a simple model of a capillary with the azimuthally periodic distribution of the refractive index in the capillary wall, we demonstrate that the transverse Poynting vector component behavior is similar to that of NCHCFs. We also consider the impact of a supporting tube on light leakage in NCHCFs.
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