Optical trapping, manipulation, and 3D imaging of disclinations in liquid crystals and measurement of their line tension

Optics near an hyperbolic defect

We examine the properties of a new family of defects called hyperbolic disclinations, and discuss their possible use for the design of perfect optical absorbers. In hyperbolic metamaterials, the ratio of ordinary and extraordinary permittivities is negative, which leads to an effective metric of Kleinian signature (two timelike coordinates). Considering a disclination in the hyperbolic nematic host matrix, we show that the timelike geodesics are Poinsot spirals, i.e. whatever the impact parameter of an incident light beam, it is confined and whirls about the defect core. The trapping effect do…

拓扑光子晶体光纤

Topological photonic crystal fibre

本文设计并制备了兼容堆叠拉丝工艺的拓扑光子晶体光纤，通过拓扑机制产生导模，实验证实其在可见光到近红外波段传输损耗低、抗弯曲性能优于传统实芯PCF，为光纤性能提升与功能拓展提供新方向。