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Updated: Jun 8, 2026

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation
Published on: March 2, 2021
Calculation of the effective index for nonguiding regions: reply to comment
Abstract:
Here we point out that in their comment Bastiaansen et al. Appl. Opt. 33, this issue (1994)] overlooked both the context of and the assumptions in Jaeger and Lai's paper [Appl. Opt. 31, 7183-7190 (1992)]. This omission appears to have resulted in their applying the Jaeger and Lai method inappropriately to a particular rib waveguide structure, yielding strange results. Therefore we present the underlying theory and ad hoc a simple and theoretically consistent method for applying it to rib waveguides. We demonstrate that good results may be obtained for a weakly guiding rib waveguide structure when field separability may be assumed, i.e., one that better meets the assumptions; this structure was chosen because numerical results were available for comparison.
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