相干背散射法测量微结构光纤中的光子局域化

Measurement of Photon Localization in Micro-Structure Optical Fibers Using Coherent Back Scattering

光子局域化是光子晶体的重要性质，提出采用相干背散射法对微结构光纤（MOFs）进行测量，为了便于理解并解释光子局域化的理论，在可见光波段分别测量了石英晶体、集束式微结构光纤和双芯型微结构光纤，应用光波经典扩散理论，搭建了实验平台。实验结果表明，对石英晶体的探测没有发现相干现象，而在575nm左右微结构光纤中产生了很强的干涉。分析认为是由于二维微结构光纤的端面中分布着从节区到脉区变化的周期结构，尺寸约为500～600nm，相当于一些不连续的散射粒子，当入射575nm光波长和这些粒子的尺寸相接近时，满足了光子局域化的条件，便产生了强烈的背相散射相干现象。

Photon localization is the fundamental property of microstructure fibers. A method of coherent back scattering for measurement on micro-structure optical fibers （MOFs） is proposed. In order to understand and explain the theory of photon loealization, the quartz-crystal, integrated multimillion micro-structure optical fiber and dual-core micro-structure optical fiber were measured in the visible region. Based on the wave classical transmission theory, the experimental equipment for the measurement was setup. The experimental results reveal that there is not interference phenomenon for quartz-crystal, but some strong interference apexes for micro structure optical fibers at 575 nm. Because of the existence of the periodic structure from the vein region to the node region in 2D micro-structure optical fibers, the dimension is around 500-600 nm which is corresponding to some discontinuous scattered particles, when the wavelength is 575 nm, the dimension is close to the particles which meets the condition of photon localization. Therefore, the phenomena of strong coherent back scattering come into being.