Borca, C.N.

Moretti, P.

Pollnau, Markus

Salathe, R.P.

Schnider, C.

Zah, F.

English

University of Twente Research Information

Optical planar waveguides in KY(WO4)2 formed by ion-beamimplantationC.N. Borca†, F. Zah†, C. Schnider†, R.P. Salathe†, M. Pollnau†∗ and P. Moretti ‡†Ecole Polytechnique Federale de Lausanne, CH-1015 Lausanne, Switzerland‡ Universite Claude Bernard Lyon 1, F-69622 Villeurbanne, FranceIon implantation can be regarded as a universal tool for fabricating low-loss waveguidestructures in optically active oxide materials [1]. In this contribution we report on im-plantation of light ions, such as He+ and H+ into undoped and Yb-doped KY(WO4)2crystals.He+ ions at 1.5 MeV with doses ranging from 1 - 3x1016 ions/cm2 were implanted intoundoped and Yb -doped KY(WO4)2 crystals. An optical barrier with a decreased effectiverefractive index has been created at the end of the ions tracks, situated approximately3.5 µm below the surface. The change in refractive index along the nm axis is of the orderof -1% respect to the bulk value.H+ ions were also implanted at energies around 1 MeV and doses from 1 - 6x1016 ions/cm2.For this energy, the proton damage distribution peaks around 10 µm below the surface.The change in effective refractive index was also negative, on the order of -2% for thehighest dose. The dominant effect during H+implantation might be of chemical nature,such as formation of O-H bonds or polarons. Therefore, the 10-µm layer created by protonimplantation is modified entirely by interaction with the proton charges and shows highlosses and no waveguiding properties. The fabrication of channel waveguides by writingsidewalls into the planar guiding layer through a slit is in progress.[1] L. Laversenne, P. Hoffmann, M. Pollnau,, P. Moretti, J. Mugnier, Appl. Phys. Lett. 85, 5167(2004),∗Electronic address: m.pollnau@ewi.utwente.nl

Optical planar waveguides in KY(WO<sub>4</sub>)<sub>2</sub> formed by ion-beam implantation

https://ris.utwente.nl/ws/files/5470726/Borca_CN-Pollnau-LPHYS05-Kyoto-Japan_P246-4-8_July_05.pdf

Optical planar waveguides in KY(WO<sub>4</sub>)<sub>2</sub> formed by ion-beam implantation

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