Highly birefringent optical microfibers.
Highly birefringent optical microfibers.
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DOI：
10.1364/oe.18.003828
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发表时间：
2010-02
期刊：
影响因子：
3.8
通讯作者：
H. Xuan;J. Ju;W. Jin
中科院分区：
文献类型：
--
作者：
H. Xuan;J. Ju;W. Jin
对具有波长和亚波长尺度横向尺寸的高双折射（Hi-Bi）空气包层二氧化硅微光纤进行了理论和实验研究。Hi-Bi光纤是从标准的SMF-28单模光纤中锥形提取的，这些光纤是通过飞秒红外激光器“切割”光纤两侧的二氧化硅包层进行“预处理”的。这种Hi-Bi mf具有近似椭圆的横截面，并由一个三层模型近似，该模型包括一个小的中央掺锗区域，周围是一个椭圆形的二氧化硅区域和一个空气包层。理论模拟表明，这种空气包层Hi-Bi光纤可以实现10（-2）阶的相位和群双折射。用长径0.9微米、长径/短径比为0.9的空气包层椭圆光纤进行实验，其群双折射率约为0.015，与理论预测相符。Hi-Bi mf可用于微米/纳米级偏振维持传输和相敏干涉传感器。
Highly birefringent (Hi-Bi) air-clad silica microfibers (MFs) with wavelength and sub-wavelength scale transverse dimensions are studied theoretically and experimentally. Hi-Bi MFs are taper-drawn from the standard SMF-28 single mode fibers that are "pre-processed" by "cutting away" parts of the silica cladding on opposite sides of the fiber with a femtosecond infrared laser. Such Hi-Bi MFs have approximately elliptical cross-sections and are approximated by a three-layer model comprising a small central Ge-doped region surrounded by an elliptical silica region and an air-cladding. Theoretical modeling shows that phase and group birefringence of the order 10(-2) can be achieved with such air-clad Hi-Bi MFs. Experiments with an air-clad elliptical fiber with a major diameter of 0.9 microm and a minor/major diameter ratio of 0.9 demonstrated a group birefringence of approximately 0.015, agreeing well with the theoretical predictions. The Hi-Bi MFs are useful for micron/nanoscale polarization maintaining transmission and phase-sensitive interferometric sensors.