Investigation of Mn Implanted LiNbO3 applying electron paramagnetic resonance technique

摘要

The effect of ion implantation on the LiNbO3 crystal is studied using electron paramagnetic resonance spectroscopy (EPR). EPR measurements on these crystals were performed as a function of ion species Mn and Fe and fluence at room temperature. Also the effect of the laser illumination on the EPR signal was determined by illuminating the crystal in situ and measuring the decay and growth of the EPR signal. LiNbO3:Mn(2+) at a depth of approximately 200 nm was formed by implantation of 2.5 x 10 to the 14th power Mn/sq cm and 1 x 10 to the 17th power Mn/sq cm at 2 MeV. The implanted samples were compared with bulk doped crystals. It was found that the decay and growth of Mn EPR for the implanted crystal is very small compared with the bulk doped LiNbO3:Mn crystal. This was found to be primarily due to the spin concentration on the crystals. On the other hand, the decay time of the high fluence is about 40% slower than the decay of the low fluence implanted crystal.