Ginn James, Alda Javier, Gómez-Pedrero José Antonio, Boreman Glenn
CREOL, University of Central Florida, 4000 Central Florida Blvd. Orlando, FL 32816-2700, USA.
Opt Express. 2010 May 24;18(11):10931-40. doi: 10.1364/OE.18.010931.
The monochromatic aberrations produced by the phase distribution reflected by resonant sub-wavelength metallic structures are studied both analytically and numerically. Even for normal incidence, the angular dependence of the re-radiated wavefront disturbs the overall performance of the reflectarray. This effect is modelled as combination of a linear and a cubic dependence. A complete numerical simulation of a multilevel focusing reflectarray is performed using computational-electromagnetic and physical-optics-propagation methods. A modified Strehl ratio is defined to show the dependence of the focused spot behavior on aperture. The irradiance distribution is dependent on the polarization state. A small-aperture focusing reflectarray has been designed, fabricated, and tested. The irradiance distribution at the focusing plane is compared with the simulated one, showing a good agreement when residual wavefront aberrations are included.
对共振亚波长金属结构反射的相位分布产生的单色像差进行了分析和数值研究。即使对于垂直入射，再辐射波前的角度依赖性也会干扰反射阵列的整体性能。这种效应被建模为线性和三次依赖性的组合。使用计算电磁学和物理光学传播方法对多级聚焦反射阵列进行了完整的数值模拟。定义了一种改进的斯特列尔比来显示聚焦光斑行为对孔径的依赖性。辐照度分布取决于偏振态。设计、制作并测试了一个小孔径聚焦反射阵列。将聚焦平面处的辐照度分布与模拟结果进行了比较，当考虑残余波前像差时，两者显示出良好的一致性。
