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arXiv 2008.06424physics.optics
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开放无损耗周期波导中的复模

Complex modes in an open lossless periodic waveguide

Amgad Abdrabou, Ya Yan Lu

摘要:

在主传播方向上具有周期性的开放周期性波导的导模是限制在波导芯周围的布洛赫模,在横向方向上没有辐射损耗。一些导模可以具有复传播常数,即复布洛赫波数,即使当周期性波导是无损的(没有吸收损耗)时。这些所谓的复模是当波导具有不连续性和缺陷时可以由入射波激发的物理解。我们表明,复杂的模式在一个开放的介质周期波导形成带,和带的端点可以被归类为少数情况下,包括极值的色散曲线的规则导模,束缚态的连续,简并复杂的模式,和特殊的衍射解决方案与闪耀的属性。本文的研究不仅加深了对周期波导的理论理解,而且对实际应用有一定的指导意义。

英文摘要:

Guided modes of an open periodic waveguide, with a periodicity in the main propagation direction, are Bloch modes confined around the waveguide core with no radiation loss in the transverse directions. Some guided modes can have a complex propagation constant, i.e. a complex Bloch wavenumber, even when the periodic waveguide is lossless (no absorption loss). These so-called complex modes are physical solutions that can be excited by incident waves whenever the waveguide has discontinuities and defects. We show that the complex modes in an open dielectric periodic waveguide form bands, and the endpoints of the bands can be classified to a small number of cases, including extrema on dispersion curves of the regular guided modes, bound states in the continuum, degenerate complex modes, and special diffraction solutions with blazing properties. Our study provides an improved theoretical understanding on periodic waveguides and a useful guidance to their practical applications.

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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