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Analytical model for polarization-dependent light propagation in waveguide arrays and applications

: Rojas-Rojas, S.; Morales-Inostroza, L.; Naether, U.; Xavier, G.B.; Nolte, S.; Szameit, A.; Vicencio, R.A.; Lima, G.; Delgado, A.


Physical Review. A 90 (2014), Nr.6, Art.063823
ISSN: 0556-2791
ISSN: 1050-2947
ISSN: 1094-1622
Fraunhofer IOF ()

We study the polarization properties of elliptical femtosecond-laser-written waveguide arrays. An analytical model is presented to explain the asymmetry of the spatial transverse profiles of linearly polarized modes in these waveguides. This asymmetry produces a polarization-dependent coupling coefficient, between adjacent waveguides, which strongly affects the propagation of light in a lattice. Our analysis explains how this effect can be exploited to tune the final intensity distribution of light propagated through the array and links the properties of a polarizing beam splitter in integrated optical circuits to the geometry of the waveguides.