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arXiv 2008.10945physics.optics
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悬浮亚波长光栅的光学空间微分

Optical spatial differentiation with suspended subwavelength gratings

Alexios Parthenopoulos, Ali Akbar Darki, Bjarke R. Jeppesen, Aurélien Dantan

摘要:

我们演示了一阶和二阶空间微分的光束横向轮廓使用薄悬浮亚波长光栅。利用电子束光刻和等离子体刻蚀技术在200 nm厚的氮化硅薄膜上制作了高反射率的一维光栅。这些光栅的光学传输,设计用于与TM或TE偏振光照明,实验测量正常和斜入射下,发现是在良好的协议与预测的分析耦合模模型,以及严格耦合波分析数值模拟。高质量的一阶和二阶空间微分的高斯光束在传输中观察到斜入射和垂直入射,分别。这种易于制造、无损耗和无损耗的光学部件对于光束成形和光学信息处理和计算可能是有吸引力的。

英文摘要:

We demonstrate first- and second-order spatial differentiation of an optical beam transverse profile using thin suspended subwavelength gratings. Highly reflective one-dimensional gratings are patterned on suspended 200 nm-thick silicon nitride membranes using Electron Beam Lithography and plasma etching. The optical transmission of these gratings, designed for illumination with either TM or TE polarized light, are experimentally measured under normal and oblique incidence and found to be in excellent agreement with the predictions of an analytical coupled-mode model as well as Rigorous Coupled Wave Analysis numerical simulations. High quality first- and second-order spatial differentiation of a Gaussian beam are observed in transmission at oblique and normal incidence, respectively. Such easy-to-fabricate, ultrathin and loss-free optical components may be attractive for beam shaping and optical information processing and computing.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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