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Control of directional evanescent coupling in fs laser written waveguides

: Szameit, A.; Dreisow, F.; Pertsch, T.; Nolte, S.; Tünnermann, A.

Postprint (512 KByte; PDF; )

Optics Express 15 (2007), No.4, pp.1579-1587
ISSN: 1094-4087
Journal Article, Electronic Publication
Fraunhofer IOF ()

We investigate the evanescent coupling of femtosecond laser written waveguides with elliptical and circular shape. A directional tuning of the coupling properties is realized in a cubic array by tilting the elliptical waveguides. This allows to specifically pronounce diagonal coupling. In contrast, directional insensitive coupling is demonstrated in a circular waveguide array based on circular waveguides.