摘要
研究了纯LiNbO3晶体和由己二酸与苯甲酸的混合摩尔比分别为30%和80%时的质子源质子交换制作的LiNbO3晶体的拉曼散射光谱。实验结果表明,纯LiNbO3晶体的拉曼光谱在0～1000cm-1的波数范围内有11个拉曼峰,这些拉曼振动模式主要由[NbO6]氧八面体的振动产生的;而质子掺杂的LiNbO3晶体的拉曼光谱,在谱线的形状和数量方面,除了与纯LiNbO3晶体的拉曼峰相同外,还发现了一个与晶体本征缺陷相关的局域模672cm-1峰,它的相对强度随着本征缺陷的程度的增加而增大,同时掺质子的浓度较大时,多数拉曼谱峰位置向高波数方向稍微移动。实验还表明,掺杂质子浓度越大,波导的模数越多,表面折射率变化、波导深度越大。
The Raman spectra of pure and proton- exchanged LiNbO3 crystals were investigated, and those protonated crystals were fabricated by proton source which was formed by a mixture of adipic and benzoic. And two concentration rates of 30% and 80% were applied, respectively. The experimental results show that there are eleven Raman peaks in the 0-1000cm^-1 frequency region of the pure LiNbO3 crystal, and those Raman peaks belong to [NbO6] octahedron lattice vibration. For the Raman spectra of protonated LiNbO3 crystals, besides the same Raman peaks as the pure LiNbO3 crystal in shape and number, a local Raman peak 672 cm^-1 is found and attributed to the intrinsic defects. Higher H^＋ concentration in the protonated crystal leads to more intrinsic defects and a higher relative intensity of the local Raman peak 672 cm^-1. Meanwhile, when the H^＋ concentration is higher, the frequency of some Raman peaks of the protonated crystals will shift to high wave number distinctly, and both the change of the surface refractive index and the waveguide depth are larger.
出处
《半导体光电》
CAS
CSCD
北大核心
2009年第5期696-699,共4页
Semiconductor Optoelectronics
基金
教育部重点科技项目(208110)
海南省自然科学基金资助项目(609002)
