Optical Bound States in Continuum in MoS2-Based Metasurface for Directional Light Emission,Nano Letters

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Optical Bound States in Continuum in MoS2-Based Metasurface for Directional Light Emission
Nano Letters ( IF 9.6 ) Pub Date : 2021-01-15 , DOI: 10.1021/acs.nanolett.0c03818
Naseer Muhammad _{1,

2} , Yang Chen ₂ , Cheng-Wei Qiu ₂ , Guo Ping Wang ₁

Affiliation

High quality factor (Q-factor) and strong field localization in nanostructures is a newly emerged direction in nanophotonics. The bound states in the continuum (BIC) have been investigated in nanoparticles with infinite Q-factor. We report BIC in molybdenum disulfide (MoS₂) based Mie nanoresonator suspended in air. The ultrathin nanodisk supports symmetry protected BIC, and the quasi-BIC (q-BIC) are exploited by breaking the symmetry of the structure. The strongly localized modes in our MoS₂-based nanodisk sustain a similar magnetic field profile before and after symmetry breaking, unlike what has been previously reported in silicon-based structures. Strong directional emission is observed in BIC regime from a hybrid configuration with a resonator placed on the stacked metal-dielectric layers, which transform BIC to q-BIC and exploit highly directional light. The structure persists emission with small variations in normalized intensity at distorted symmetry. The giant Q-factor in q-BIC is highly desired for biosensing and optical filters.

中文翻译：

基于MoS ₂的超表面连续光的束缚态，用于定向发光

纳米结构中高质量因子（Q因子）和强场局部化是纳米光子学中的一个新兴方向。已经在具有无限Q因子的纳米粒子中研究了连续体（BIC）的结合态。我们报道了悬浮在空气中的基于二硫化钼（MoS ₂）的Mie纳米谐振器中的BIC 。超薄纳米磁盘支持对称性受保护的BIC，并且通过破坏结构的对称性来利用准BIC（q -BIC）。MoS _2中的强本地化模式与先前在基于硅的结构中报道的不同，基于对称的纳米盘在对称破坏前后都保持相似的磁场分布。在BIC方案中，通过将谐振器放置在堆叠的金属介电层上的混合配置中观察到了强烈的定向发射，该谐振器将BIC转换为q -BIC并利用了高度定向的光。该结构在对称性失真的情况下以标准化强度的微小变化保持发射。q -BIC中的巨大Q因子非常需要生物传感和光学滤波器。

更新日期：2021-01-27

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