BST负折射特性实验验证

对钛酸锶钡BaxSr（1-x）TiO3（0〈x〈1）（BST）柱阵列异向介质棱镜的负折射进行了实验验证．实验结果表明，该BST柱构成的三维异向介质的负折射特性不依赖于柱体的排列周期，而是BST柱自身的谐振造成了电磁波在该棱镜中的负折射．BST柱排列周期仅对二次负折射的强度产生影响．例如：周期阵列的BST柱异向介质棱镜的斜边是阶梯状时，因具有光栅结构，使得在该斜边上发生的二次负折射被增强；随机阵列的BST棱镜的斜边不具有光栅结构，观察到的二次负折射就比较弱．采用等效介质理论的仿真结果与我们的实验结果符合较好．

Experimental verification on negative refraction of BST

The negative effect of prism made of the BaxSr（1-x）TiO3（0〈x〈1） metamaterial columns is verified by experimental results Experimental results show that the negative refraction properties of three-dimensional metamaterial made of BST columns are not dependent on the cycle arrangement of BST columns, but the resonance of BST columns itself causes the negative refraction of electromagnetic waves in the BST prism. The cycle arrangement of BST columns only effects the intensity of second negative refraction. For example, the second negative refraction on the hypotenuse of BST prism with periodic arrays is enhanced by ladder-like hypotenuse with a grating structure; while the prism hypotenuse of BST with random arrays is not a grating structure, and the secondary negative refraction that observed is relatively weak. The simulating results of effective media theory are consistent with our experimental results.