摘要
精确测量大气的折射率起伏,对于研究大气的光学性质及其在环境监测中的应用有着重要的意义。建立了用近场光学方法测量大气折射率起伏的模型:采用全内反射方法激发金属的表面等离子共振,在金属-空气-金属组成的平面波导中形成振荡的导模,选取衰减全反射曲线中变化最快的一点的角度作为入射光的角度,测量相应的反射光光强的变化,就可以得到相应空气的折射率的变化。初步数值模拟了该模型的测量精度,折射率变化的精度可以达到百万分之五。
Exactlv measurement of the fluctuation of the atmosphere refractivity is important for the research on the optical property of atmosphere an and it＇s application on the environmental detection. A theoretical model of measuring the fluctuation of the atmosphere refractivity using the near-field optical method is proposed： The surface plasmon resonance effect of the metal is stimulated by the internal total reflection. As a result the propagation mode will be induced in the planar waveguide. The point of the maximum slope in the curve of attenuated internal total reflection is selected as the angular of the incident beam. The variation of the intensity of the reflection beam demonstrates the variation of the refractivity of the atmosphere. The precision achieved using the numerical simulation is 0.000005.
出处
《量子电子学报》
CAS
CSCD
北大核心
2005年第5期814-816,共3页
Chinese Journal of Quantum Electronics
基金
安徽省自然科学基金基金(03046204)
关键词
大气光学
近场光学
表面等离子体共振效应
折射率起伏
atmosphere optics： near-field optical method
surface plasmon resonance effect
fluctuation of refractivity
