标题：Two waveguide layers in lithium niobate crystal formed by swift heavy Kr ion irradiation
作者机构：[刘涛;孔伟金]School of Physics, Qingdao University, Qingdao 266071, China.;[刘涛;孔伟金]Key Laboratory of Photonics Mater/a/s and Technology in Univer 更多
摘要：We report the formation of two waveguide layers in a lithium niobate crystal by irradiation with swift heavy Kr ions with high(Ge V) energies and ultralow fluences. The micro-Raman spectra are measured at different depths in the irradiated layer and show that the high electronic energy loss can cause lattice damage along the ion trajectory, while the nuclear energy loss causes damage at the end of the ion track. Two waveguide layers are formed by confinement with two barriers associated with decreases in the refractive index that are caused by electronic and nuclear energy losses, respectively.