Leaky Bloch modal evolution of wideband reflectors with zero-contrast gratings from symmetric trapezoid to triangle ridge shapes

doi:10.1117/1.Oe.59.12.127102

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	Leaky Bloch modal evolution of wideband reflectors with zero-contrast gratings from symmetric trapezoid to triangle ridge shapes
	G. H. Xing,S. W. Zhang and R. Magnusson
	2020
发表期刊	Optical Engineering
ISSN	0091-3286
卷号	59 期号:12 页码:10
摘要	We treat wideband subwavelength guided-mode resonant gratings with grating-depth dependent duty cycles. By rigorous numerical computations, we visualize Bloch modal evolution while transforming the grating profile from trapezoid to triangle. Parametric optimization is achieved using the coordinate transformation method of Chandezon. With the increase of the profile base angle, the higher mixed resonant modes TM1,1&2 attract and combine and interact with the modes at both sides, forming wide reflection bands. This modal combination and interaction are the key determinant of broadband reflectivity spectral location and width. The optimized structure exhibits 99% reflectivity across a 613-nm spectral range, spanning a 1438- to 2051-nm wavelength range with a fractional bandwidth of similar to 35%. It is shown that gratings with trapezoidal profiles possess a good tolerance to groove depth variation, thus being easier to fabricate with a diamond-tip than triangular profile-based gratings. (c) The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
DOI	10.1117/1.Oe.59.12.127102
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收录类别	SCI
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/64647
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	G. H. Xing,S. W. Zhang and R. Magnusson. Leaky Bloch modal evolution of wideband reflectors with zero-contrast gratings from symmetric trapezoid to triangle ridge shapes[J]. Optical Engineering,2020,59(12):10.
APA	G. H. Xing,S. W. Zhang and R. Magnusson.(2020).Leaky Bloch modal evolution of wideband reflectors with zero-contrast gratings from symmetric trapezoid to triangle ridge shapes.Optical Engineering,59(12),10.
MLA	G. H. Xing,S. W. Zhang and R. Magnusson."Leaky Bloch modal evolution of wideband reflectors with zero-contrast gratings from symmetric trapezoid to triangle ridge shapes".Optical Engineering 59.12(2020):10.

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