Fabrication of optical strip waveguides with nearly circular cross section by silver ion migration technique

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Abstract
Circular optical waveguides have been fabricated from vacuum‐deposited Ag layers by ion migration technique into soda‐lime substrate glass. In this method two different guide patterns, one of which is the mirror image of the other, are made. Later the guide patterns are placed on top of each other and circular guides are thus obtained. The ends of the guides are studied by optical microscope and the near‐field scanning method. The optical loss spectrum is measured from 450 to 1600 nm.