环境折射率变化对纳米线光纤场强分布的影响  

Influence of the circumstance refractive indices on the field intensity distributions in nano-fiber

作　　者：周寒青[1] 隋成华[1] 

机构地区：[1]浙江工业大学理学院,浙江杭州310023

出　　处：《浙江工业大学学报》2011年第2期228-230,236,共4页Journal of Zhejiang University of Technology

摘　　要：基于光学倏逝波的光纤或波导传感器是目前的重要发展方向之一.从Maxwell方程出发,得到由于周围环境折射率变化而引起的光纤场强分布的变化.结果表明:纳米线光纤中的光场场强分布跟环境折射率有较为敏感的关系.在相同的外界环境下,纳米线光纤直径D大的光纤纤芯内光场能量较强,纳米线光纤直径D小的光纤纤芯内光场能量较弱;对相同直径D的纳米线光纤,随着外界折射率的增大,光损耗越来越强.这为纳米线波导在光传感领域的应用提供了有力的证据.The sensor based on evanescent field of subwavelength-diameter wires are very promising for developing future micro-photonic devices.In this paper,the field intensity distributions in the fundamental mode of a nano-fiber are studied with exact solutions of Maxwell＇s equations.It shows that the circumstance refractive indices substantially influence the field intensity distribution.Under the same circumstance,a thinner nano-fiber has weaker confinement;While with a certain diameter,the fraction power inside the core（η） decreases with the circumstance refractive indices.The study of such properties is necessary for the use of nano-fibers as sensors.

关 键 词：纳米线光纤 MAXWELL方程 场强分布 

分 类 号：TN253[电子电信—物理电子学]