Hi Andreas "The light cone is NOT determined by the "average" refractive index in a given direction, at least not for any simple definition of "average". Rather, it is determined by the lowest-lying mode of the cladding as described in the 'Physical Review B, Vol.60, p.5751 (1999)'.
For a homogeneous cladding, of course, this is just w=ck/n. But for a periodic cladding, say oxide pierced by a 2d array of holes, then to get the light line you must do a 2d calculation of the band structure in the oxide pattern... the lowest (TM *or* TE) band of this 2d pattern is then the boundary of the light cone."--SGJ Regards -- ============================================== Hasan, Md. Tanbir, Graduate Student (Final year) Master of Photonics Science and Engineering Ghent University and Vrije Universiteit Brussel Belgium Alt Email: [email protected], [email protected], ============================================== _______________________________________________ mpb-discuss mailing list [email protected] http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/mpb-discuss
