LiNbO_3光波导紫外表面等离子共振传感器模拟计算  

Simulation calculation on LiNbO_3 optical waveguide UV surface plasmon resonance sensor

作　　者：符运良[1] 

机构地区：[1]海南师范大学物理与电子工程学院,海南海口571158

出　　处：《传感器与微系统》2011年第8期124-126,130,共4页Transducer and Microsystem Technologies

基　　金：海南省重点科技基金资助项目(ZDXM20100099);海南省自然科学基金资助项目(609002)

摘　　要：高折射率的L iNbO3光波导,构成四层高折射率波导表面等离子共振传感器。采用传输矩阵方法得基模TM模色散表达式,研究了光波导有效折射与样品折射率之间的关系、光波导传输常数和波长的关系,由表面等离子体波共振耦合条件,得到不同样品折射率的表面等离子共振波长。利用菲涅耳的反射率公式,计算了四层结构波导传感器的透射谱,得到表面等离子共振波长,计算结果表明:与低折射率的玻璃波导相比,高折射率的L iNbO3光波导传感器,在相同样品折射率下,共振波长向短波方向移动,并且测量的折射率范围大。A novle surface plasmon resonance（SPR）sensor consisting of four layers high refractive index of LiNbO3 optical waveguide is proposed.The TM mode dispersion formula is inferred by using transfer matrix method.The relationship between waveguide effective refractive index and refractive index of sample,and the relationship between the waveguide transport constants and wavelength are studied,the SPR wavelengths versus refractive indices of sample are achieved by SPR coupling conditions.The transmission spectrum of the SPR are calculated.Simulation computational results indicate that the resonance wavelengths of SPR sensor with high refractive index LiNbO3 optical waveguide move to shortwave direction compared to the SPR sensor with low refractive index of glass waveguide in the same refractive index of sample,and it has large measurement of refractive index range.

关 键 词：LINBO3光波导 表面等离子共振 传播常数 共振波长 

分 类 号：TN253[电子电信—物理电子学] TP212[自动化与计算机技术—检测技术与自动化装置]