9 papers
The radiated fields of the fundamental mode of photonic crystal fibers
Ali Dabirian, Mahmood Akbari, Niels Asger Mortensen
The six-fold rotational symmetry of photonic crystal fibers has important manifestations in the radiated fields in terms of i) a focusing phenomena at a finite distance from the en…
Semi-analytical approach to short-wavelength dispersion and modal properties of photonic crystal fibers
Niels Asger Mortensen
We consider photonic crystal fibers made from arbitrary base materials and derive a unified semi-analytical approach for the dispersion and modal properties which applies to the sh…
Reexamination of Hagen-Poiseuille flow: shape-dependence of the hydraulic resistance in microchannels
Niels Asger Mortensen, Fridolin Okkels, Henrik Bruus
We consider pressure-driven, steady state Poiseuille flow in straight channels with various cross-sectional shapes: elliptic, rectangular, triangular, and harmonic-perturbed circle…
Ultra-large bandwidth hollow-core guiding in all-silica Bragg fibers with nano-supports
G. Vienne, Y. Xu, C. Jakobsen +12
We demonstrate a new class of hollow-core Bragg fibers that are composed of concentric cylindrical silica rings separated by nanoscale support bridges. We theoretically predict and…
Electro-hydrodynamics of binary electrolytes driven by modulated surface potentials
N. A. Mortensen, L. H. Olesen, L. Belmon +1
We study the electro-hydrodynamics of the Debye screening layer that arises in an aqueous binary solution near a planar insulating wall when applying a spatially modulated AC-volta…
Photonic crystal fiber with a hybrid honeycomb cladding
N. A. Mortensen, M. D. Nielsen, J. R. Folkenberg +2
We consider an air-silica honeycomb lattice and demonstrate a new approach to the formation of a core defect. Typically, a high or low-index core is formed by adding a high-index r…