Abstract
The barrier planar waveguides are fabricated for the first time inz-cut LGS (La3Ga5SiO14) crystals by 3.0 MeVand 6.0 MeV carbon ion implantations with dose of 2×1015ions/cm2 at room temperature. Four and six dark modes wereobserved by the prism-coupling method, respectively. The refractiveindex profiles were reconstructed by using the reflectivity calculationmethod. There are about 1.6% and 0.9% decreases at the opticalbarriers in the 3.0 MeV and 6.0 MeV cases, and the positions of theoptical barriers are close to that of the damage peaks calculated bythe TRIM'98 (Transport of Ions in Matter) code. It is found that therefractive index change may partly be due to the damage induced by thenuclear collision.
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