基于光纤-胶体晶体的液体折射率传感实验研究

Experimental study on liquid refractive index sensing based on fiber-colloidal crystal

制备了胶体晶体,并利用胶体晶体的光子带隙对折射率传感进行了实验研究。从理论上分析了胶体晶体光子带隙中心波长的变化与折射率的关系。通过设计模具制备了胶体晶体-光纤结构,用扫描电镜对胶体晶体的表面进行了观察,并测量了胶体晶体的光子带隙的位置。结果表明胶体晶体的光子带隙的测试结果与理论分析相一致。设计了实验装置,利用光纤间的耦合对胶体晶体的光子带隙的变化进行了测试和分析。结果表明SiO2胶体晶体光子带隙的中心波长为1445.5nm,且在不同折射率液体环境下,其中心波长发生移动,能够形成新的传感机理。对胶体晶体在液体传感上的应用进行了探索。

The colloidal crystals are prepared, and the changes of colloidal crystals photonic band-gap are used to study the refractive index sensing by experiment. The changes in the center wavelength of the colloidal crystals photonic band-gap are analyzed, the relationship between band-gap and refractive index is discussed in theory. The mould is de- signed to obtain colloidal crystals-fiber structure, colloidal crystals are observed by scan microscope and the band-gap po- sition is measured. The results show that the measured results agree with the theoretical analysis well. The experimental device is designed to test liquid refractive index, the couple of the fibers are used to measure the band-gap of colloidal crystals and the results are also analyzed in theory. The results show that the position of a center wavelength of the silica photonic band-gap is at 1445.5 nm, and the band-gap of colloidal crystals can be used to measure the liquid refractive index in different liquid. The new sensing mechanism is formed and it provides a new application of colloidal crystals in the liquid sensing.