Wang Haiyang, Baker Chams, Chen Liang, Bao Xiaoyi
Opt Lett. 2021 Mar 1;46(5):945-948. doi: 10.1364/OL.418137.
In this Letter, we design and fabricate elliptical-core (ECORE) chalcogenide-polymethyl methacrylate (-PMMA) microfibers to explore the birefringence impact on stimulated Brillouin scattering. Numerical simulations based on the finite-element method and elastodynamic equation are utilized to calculate the phase and group birefringence and Brillouin gain spectra of the fundamental mode in three ECORE -PMMA microfibers at different core diameters. Experimentally measured and numerically calculated results show that as the core diameter of the minor axis of an ECORE microfiber with a ratio of 1.108 is reduced from 1.50 µm to 0.87 µm, a high group birefringence of ∼10 to ∼10 and a large Brillouin frequency shift difference of ∼6 to ∼30 are achieved, while the Brillouin gain spectra are broadened significantly from ∼70 to ∼140. The high-birefringence ECORE -PMMA microfiber is important for Brillouin sensing due to the tailorable high birefringence and ultrahigh nonlinearity.
在本信函中，我们设计并制作了椭圆芯（ECORE）硫族化物 - 聚甲基丙烯酸甲酯（-PMMA）微纤维，以探究双折射对受激布里渊散射的影响。基于有限元方法和弹性动力学方程的数值模拟被用于计算三种不同芯径的ECORE -PMMA微纤维中基模的相位双折射、群双折射和布里渊增益谱。实验测量和数值计算结果表明，对于长径比为1.108的ECORE微纤维，当其短轴芯径从1.50 µm减小到0.87 µm时，可实现约10⁻³至约10⁻²的高群双折射和约6至约30的大布里渊频移差，同时布里渊增益谱从约70显著拓宽至约140。由于可定制的高双折射和超高非线性，高双折射ECORE -PMMA微纤维对布里渊传感具有重要意义。
