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Broadband circular polarizer based on high-contrast gratings

机译:基于高对比度光栅的宽带圆偏振器

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摘要

A circular polarizer, which is composed of periodic and two-dimensional dielectric high-contrast gratings, is designed theoretically such that a unity conversion efficiency is achieved at λ0 = 1.55 μm. The operation is obtained by the achievement of the simultaneous unity transmission of transverse magnetic and transverse electric waves with a phase difference of π/2, meaning that an optimized geometrical anisotropy is accomplished. By the utilization of the rigorous coupled-wave analysis and finite-difference time-domain methods, it is shown that a percent bandwidth of ∼50% can be achieved when the operation bandwidth is defined as the wavelengths for which the conversion efficiency exceeds 0.9. © 2012 Optical Society of America.
机译:从理论上设计一个由周期和二维介电高对比度光栅组成的圆偏振器,以便在λ0= 1.55μm时实现单位转换效率。通过实现具有π/ 2相位差的横向电磁波和横向电波的同时统一传输来实现该操作,这意味着可以实现最佳的几何各向异性。通过使用严格的耦合波分析和有限差分时域方法,可以看出,当将工作带宽定义为转换效率超过0.9的波长时,可以实现约50%的带宽百分比。 ©2012美国眼镜学会。

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