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Figure 1
Schematic representation of a thin-film waveguide with refractive indexes n1, n2 and n3 for the cover layer, the core and the underlayer, respectively. The environment has n0 = 1. φ0 and φ2 are the angles of grazing incidence onto the waveguide surface and onto the internal interfaces, respectively. d1 and d2 are the thickness for the cover and the guiding layer and Δl is the longitudinal beam advance between two bounces in the coordinate system of the waveguide, where l is the coordinate along the beam footprint, which extends from l1 to l2. Arrows of different thickness approximately indicate the beam attenuation during the travelling of waves coupled earlier into the waveguide. Note that the angles and vertical dimensions are exaggerated for clarity.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 11| Part 5| August 2004| Pages 386-392
doi:10.1107/S0909049504016826
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