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论文类型：期刊论文

发表刊物：Journal of optics

所属单位：光电学院，国家光电研究中心

刊物所在地：美国

学科门类：工学

项目来源：自然科学基金

文献类型：J

卷号：18

页面范围：065801

关键字：spatial mode, mode discriminator, leaky waveguides

DOI码：10.1088/2040-8986/aabc65

发表时间：2018-05-04

教研室：c716

摘要：We propose a conceptually simple and experimentally compatible configuration to discriminate the spatial mode based on leaky waveguides, which are inserted in-between the transmission link. The essence of such a spatial mode discriminator is to introduce the leakage of the power flux on purpose for detection. Importantly, the leaky angle of each individual spatial mode with respect to the propagation direction are different for non-degenerated modes, while the radiation patterns of the degenerated spatial modes in the plane perpendicular to the propagation direction are also distinguishable. Based on these two facts, we illustrate the operation principle of the spatial mode discriminators via two concrete examples; a w-type slab leaky waveguide without degeneracy, and a cylindrical leaky waveguide with degeneracy. The correlation between the leakage angle and the spatial mode distribution for a slab leaky waveguide, as well as differences between the in-plane radiation patterns of degenerated modes in a cylindrical leaky waveguide, are verified numerically and analytically. Such findings can be readily useful in discriminating the spatial modes for optical communication or optical sensing.

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发布期刊链接：https://iopscience.iop.org/article/10.1088/2040-8986/aabc65/meta