Elegant vector normal modes at a dielectric interface

Details Elegant vector normal modes at a dielectric interface Elegant vector normal modes at a dielectric interface

2008-10-13

arxiv.org/abs/0810.2291v3

Physics

Optics

28 pages, 7 figures

Scientific paper

Reflection and transmission of narrow beams at a dielectric interface is analysed. It is confirmed that for arbitrary incidence two types of beams - Elegant Hermite-Gaussians of linear polarization and Elegant Laguerre-Gaussians of circular polarization, both defined in the interface plane - can be treated as vector normal modes of the interface. Excitation of higher-order modes by cross-polarization coupling is described by changes of mode indices induced by generalised transmission and reflection matrices. It is explicitly shown that, off-axis in general, spectral placements of the excited optical vortices are determined by elements of these matrices, depended in turn on beam incidence. Numerical simulations of beam reflection entirely confirm theoretical predictions. The current paper is a continuation and extension of a previous work by W. Nasalski [Phys. Rev. E 74, 056613 (2006)].

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