Graphical representation of prism coupling into thin films.
A natural framework for evaluating prism-coupler performance is provided by a recently developed geometrical construction in which refraction through a prism for an arbitrary angle of incidence is represented by an ellipse. The useful operating range of a prism coupler is represented by the portion of the representational ellipse that appears within a window determined by the mode propagation conditions of a thin-film-substrate system.
Feldman
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National Bureau of Standards, Inorganic Materials Division, Washington, DC 20234, USA.