应用变换光学理论调控电磁场光束束宽

根据变换光学理论，提出了利用超常材料调控光束束宽及将有限束宽光束变成线光束的理论方案，得到了所需超常材料的介电常数和磁导率的解析结果。应用这些结果，可以实现对光束束宽的调控或者将有限束宽光束压缩成线光束。利用有限元分析方法进行全波仿真，仿真结果与理论相符合,可应用于压缩或扩展电磁波束的能量密度。线光束中心处的场能量密度极大，可应用于增强非线性光学效应等方面。

Modulation of electromagnetic beamwidth based on transformation optics

A scheme using metamaterials is proposed to modulate beamwidth and obtain a line beam from a beam with finite width based on transformation optics, and the constitutive tensors of metamaterials are educed. The good performance of the proposed medium is verified through full-wave numerical simulations based on the finite element method. Such an electromagnetic wave-manipulating medium provides alternative ways either to expand or to compress the electromagnetic beamwidth. And the line beam with very high energy density at the beam center would find applications in enhancing nonlinear optical effects or other areas.