一种新型贝塞尔光束器件的设计方法

A method of designing new Bessel beam generator

悬链线型亚波长结构可以实现连续的相位调控。但是,普通悬链线孔径两端较窄,不易于加工。另外,以往直接在仿真软件CST中建立复杂模型较为困难,仿真过程较为繁琐。本文提出了用等宽悬链线狭缝替代普通悬链线狭缝,并设计了用于产生贝塞尔光束的等宽悬链线超表面,为二维光电器件的设计提供了新思路。在建模仿真过程中使用Matlab调用CST进行联合仿真,直接在Matlab中完成所有建模、仿真、修改参数等操作。该方法可以用于设计复杂结构,同时结合Matlab数值优化能力得到更理想的仿真效果。

Catenary nanostructures enable continuous phase control.However,the ordinary catenary nanostructure has narrow width at both ends and is not easy to be fabricated.On the other side,it was difficult to build complex model directly in simulation software CST,and the simulation process was complicated in the past.The equal-width catenary slit is proposed to replace the normal catenary slit.And the equal-width catenary-type metasurface has been designed to generate Bessel beam,which provides a new idea for the design of two-dimensional optical devices.In the process of modeling and simulation,CST is combined with Matlab for co-simulation,and all operations,such as modeling,simulations,and parameter modification,are completed directly in Matlab.This method can be used to design complex structures,and more ideal simulation results can be obtained combined with the numerical optimization ability of Matlab.