Nonlinear optical waveguides generated in lithium niobate by swift-ion irradiation at ultralow fluences
Nonlinear optical waveguides generated in lithium niobate by swift-ion irradiation at ultralow fluences
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DOI：
10.1364/ol.32.002587
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发表时间：
2007-09-01
期刊：
影响因子：
3.6
通讯作者：
Caballero, O.
中科院分区：
文献类型：
--
作者：
Olivares, J.;Garcia-Navarro, A.;Caballero, O.
提出了一种制备铌酸锂（LiNbO 3）光波导的新方法。它是基于快速离子的电子激发损伤，即，能量大约为1 MeV/amu或更高。新技术使用高能量中等质量离子，如Cl，其电子阻止能力高于非晶化阈值（5-6 keV/nm），在晶体内部几微米处达到最大值。在超低能流区域（10（12）-10（13）cm（-2）），获得了有效的纳米结构介质，其表现为光波导，其中光横向传播到由每次单次撞击产生的非晶纳米轨道。该方法意味着相对于He注入减少4个数量级。对于最低能量密度，光波导呈现合理的损耗（类似于10 dB/cm）和显著的二次谐波产生（SHG）和电光（EO）响应（> 50%体积）。(c)2007年，美国光学学会。
A novel method to produce optical waveguides is demonstrated for lithium niobate (LiNbO3). It is based on electronic excitation damage by swift ions, i.e., with energies at approximately I MeV/amu or above. The new technique uses high-energy medium-mass ions, such as Cl, with electronic stopping powers above the threshold value for amorphization (5-6 keV/nm), reaching the maximum value a few micrometers inside the crystal. At the ultralow fluence regime (10(12)-10(13) cm(-2)) an effective nanostructured medium is obtained that behaves as an optical waveguide where light propagates transversally to the amorphous nanotracks created by every single impact. The method implies a reduction of 4 orders of magnitude with respect to He implantation. The optical waveguides present reasonable losses (similar to 10 dB/cm) and significant second-harmonic generation (SHG) and electro-optic (EO) responses (> 50% bulk) for the lowest fluences. (c) 2007 Optical Society of America.