title: Steering electromagnetic beams with conical curvature singularities.
abstract: We describe how the transformation-optics technique can be used to design an effective medium mimicking the conical curvature singularity. Anholonomic coordinate transformation gives rise to linear topological defects that break the rotational symmetry. The bending and splitting of the optical beams are found analytically and numerically, depending on the incident direction and the topological charge. Beyond their practical applications to omnidirectional beam steering for photonics, our findings set forth an attractive realm to simulate the relevant physical phenomena in the optical laboratory.
authors.forename: Yong-Liang
authors.initials: YL
authors.lastname: Zhang
authors.forename: Xian-Zi
authors.initials: XZ
authors.lastname: Dong
authors.forename: Mei-Ling
authors.initials: ML
authors.lastname: Zheng
authors.forename: Zhen-Sheng
authors.initials: ZS
authors.lastname: Zhao
authors.forename: Xuan-Ming
authors.initials: XM
authors.lastname: Duan