Thin film optical waveguide

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350359, G02B 514

Patent

active

041115236

ABSTRACT:
It is known to form an optical waveguiding thin film on a substrate. For various practical reasons, it is often desired that an optical beam coupled to the film be laterally confined so as to propagate only in a longitudinal stripe portion of the film. As disclosed herein, this is accomplished by depositing spaced-apart elements in contact with one surface of the film to establish in a narrow longitudinal region of the film between the elements an effective index of refraction that is higher than the index of the remainder of the film. In this way a longitudinal waveguiding stripe is formed on the film without the necessity of irradiating, etching or otherwise directly treating the film itself.

REFERENCES:
patent: 3695745 (1972-10-01), Furukawa
patent: 3795434 (1974-03-01), Ash
patent: 3801185 (1974-04-01), Ramaswamy et al.
patent: 3832567 (1974-08-01), Jacques et al.

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