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Chin. Phys. B, 2015, Vol. 24(5): 056102    DOI: 10.1088/1674-1056/24/5/056102
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Two waveguide layers in lithium niobate crystal formed by swift heavy Kr ion irradiation

Liu Tao (刘涛)a b, Huang Qing (黄庆)c, Zhao Jin-Hua (赵金花)d, Kong Wei-Jin (孔伟金)a b, Liu Peng (刘鹏)e, Zhang Lian (张连)e, Zhou Yu-Fan (周育范)e, Yu Xiao-Fei (于晓飞)e, Wang Lei (王磊)e, Wang Xue-Lin (王雪林)e
a School of Physics, Qingdao University, Qingdao 266071, China;
b Key Laboratory of Photonics Materials and Technology in Universities of Shandong (Qingdao University), Qingdao 266071, China;
c Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;
d School of Science, Shandong Jianzhu University, Jinan 250101, China;
e School of Physics, State Key Laboratory of Crystal Materials and Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University, Jinan 250100, China
Abstract  

We report the formation of two waveguide layers in a lithium niobate crystal by irradiation with swift heavy Kr ions with high (GeV) 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.

Keywords:  optical waveguide      swift heavy ions      lithium niobate  
Received:  18 November 2014      Accepted manuscript online: 
PACS:  61.80.Jh (Ion radiation effects)  
  42.79.Gn (Optical waveguides and couplers)  
Fund: 

Project supported by the National Natural Science Foundation of China (Grant Nos. 11275117, U1432120, and 11274188) and the Heavy Ion Research Facility in Lanzhou (HIRFL), China.

Corresponding Authors:  Wang Xue-Lin     E-mail:  xuelinwang@sdu.edu.cn
About author:  61.80.Jh; 42.79.Gn

Cite this article: 

Liu Tao (刘涛), Huang Qing (黄庆), Zhao Jin-Hua (赵金花), Kong Wei-Jin (孔伟金), Liu Peng (刘鹏), Zhang Lian (张连), Zhou Yu-Fan (周育范), Yu Xiao-Fei (于晓飞), Wang Lei (王磊), Wang Xue-Lin (王雪林) Two waveguide layers in lithium niobate crystal formed by swift heavy Kr ion irradiation 2015 Chin. Phys. B 24 056102

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