Fan Chen-Feng, Chiang Chih-Lun, Yu Chin-Ping
Department of Photonics, Institute of Electro-optical Engineering, and Advanced Crystal Opto-electronic Research Center, National Sun Yat-Sen University, Kaohsiung, Taiwan 80424, Taiwan.
Opt Express. 2011 Oct 10;19(21):19948-54. doi: 10.1364/OE.19.019948.
We have experimentally investigated the birefringent properties of photonic crystal fiber (PCF) coils in cooperation with a Sagnac loop interferometer. By reducing the bending radius of the PCF coils, very clear interference patterns can be observed for the bending-induced stress effect. Increasing the fiber turns can result in more obvious interference patterns with smaller fringe spacing but has no contribution to the increment of the birefringence value. The fabricated PCF coil is employed in the transverse displacement sensing. Very high sensing sensitivity of 90.4 nm/mm can be achieved due to the large displacement-induced bending radius variations.
我们与萨尼亚克环干涉仪合作，对光子晶体光纤（PCF）线圈的双折射特性进行了实验研究。通过减小PCF线圈的弯曲半径，可以观察到因弯曲诱导应力效应而产生的非常清晰的干涉图样。增加光纤匝数会导致干涉图样更明显，条纹间距更小，但对双折射值的增加没有贡献。所制备的PCF线圈用于横向位移传感。由于位移引起的弯曲半径变化较大，可实现90.4 nm/mm的非常高的传感灵敏度。
