Dual Friedrich-Wintgen bound states in the continuum in asymmetric all-silicon photonic crystal slabs

IF 3.5 2区工程技术 Q2 OPTICS

Optics and Lasers in Engineering Pub Date : 2025-05-27 DOI:10.1016/j.optlaseng.2025.109105

Yuying Wang, Jianjun Liu, Fangzhou Shu, Yong Du, Zhi Hong

引用次数: 0

Abstract

We propose and demonstrate the realization of dual Friedrich-Wintgen (F–W) bound states in the continuum (BICs) in a terahertz all-silicon photonic crystal (PhC) slab. A symmetric PhC slab with cylindrical hole array supports an electric quadrupole-SP BIC, which transitions into a quasi-SP BIC upon the breaking of its C_2v symmetry. By adjusting the asymmetry parameter, the quasi-SP BIC can be transformed into two F–W BICs due to its destructive interference with two guided mode resonances (GMRs), respectively. Notably, the frequency of one F–W BIC exhibits robustness to the thickness of the PhC slab over an extremely wide range, which is very useful for its practical applications.

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非对称全硅光子晶体板连续介质中的双Friedrich-Wintgen束缚态

我们提出并演示了在太赫兹全硅光子晶体（PhC）板上实现连续介质（BICs）中的双弗里德里希-温根束缚态（F-W）。采用圆柱孔阵列的对称PhC板支撑电四极- sp BIC，当其C2v对称性被打破时，电四极- sp BIC转变为准sp BIC。通过调整不对称参数，准sp BIC可因其与两个导模共振（GMRs）的相消干涉而分别转化为两个F-W BIC。值得注意的是，一个F-W BIC的频率在极宽的范围内对PhC板的厚度表现出鲁棒性，这对其实际应用非常有用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optics and Lasers in Engineering 工程技术-光学

CiteScore

8.90

自引率

8.70%

发文量

384

审稿时长

42 days

期刊介绍： Optics and Lasers in Engineering aims at providing an international forum for the interchange of information on the development of optical techniques and laser technology in engineering. Emphasis is placed on contributions targeted at the practical use of methods and devices, the development and enhancement of solutions and new theoretical concepts for experimental methods. Optics and Lasers in Engineering reflects the main areas in which optical methods are being used and developed for an engineering environment. Manuscripts should offer clear evidence of novelty and significance. Papers focusing on parameter optimization or computational issues are not suitable. Similarly, papers focussed on an application rather than the optical method fall outside the journal''s scope. The scope of the journal is defined to include the following: -Optical Metrology- Optical Methods for 3D visualization and virtual engineering- Optical Techniques for Microsystems- Imaging, Microscopy and Adaptive Optics- Computational Imaging- Laser methods in manufacturing- Integrated optical and photonic sensors- Optics and Photonics in Life Science- Hyperspectral and spectroscopic methods- Infrared and Terahertz techniques