Second harmonic generation from bound-state in the continuum-hosted few-layers van der Waals metasurface

IF 6.5 2区物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Nanophotonics Pub Date : 2025-01-16 DOI:10.1515/nanoph-2024-0630

Naseer Muhammad, Azra Begum, Zhaoxian Su, Lingling Huang

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引用次数: 0

Abstract

Monolayer transition metals dichalcogenides (TMDs) have been coupled to bound-state in the continuum (BIC) hosted dielectric structures to attain high second harmonic generation (SHG). However, the transvers electric modes are strongly localized in the waveguides result in fairly weak exciton-photon coupling in monolayer TMD placed on the surface. To achieve SHG in few-layers TMDs based BIC-inspired structure is a challenge. Here, we report BIC in few-layers TMDs metasurface with high quality factor (Q-factor), tunability, and modes-upholding in different environments. The metasurface sustains BIC at different thickness of the meta-atoms, which is highly desired for maintaining the accuracy in fabrications. Next, we calculate the SHG efficiency from few-layers TMD metasurface around BIC wavelengths. The high conversion efficiency in this work is 1.47 × 10−4 for 6 mW incident power. Moreover, our design is highly thin and can be used for various linear and non-linear applications in optics. This study will provide a new route to next generation post-silicon metasurfaces.

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连续载少层范德华超表面中束缚态二次谐波的产生

单层过渡金属二硫族化合物（TMDs）在连续介质（BIC）介质结构中与束缚态耦合以获得高二次谐波。然而，横向电模式在波导中的强局部化导致放置在表面的单层TMD中相当弱的激子-光子耦合。在基于多层tmd的bic启发结构中实现SHG是一个挑战。在这里，我们报告了在不同环境下具有高质量因子（q因子）、可调性和模式维持的几层tmd元表面中的BIC。超表面在不同厚度的元原子上维持BIC，这对于保持制造精度是非常需要的。接下来，我们计算了BIC波长附近的几层TMD超表面的SHG效率。当入射功率为6mw时，转换效率为1.47 × 10−4。此外，我们的设计非常薄，可用于光学中的各种线性和非线性应用。该研究将为下一代后硅超表面提供一条新的途径。

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

Nanophotonics NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

13.50

自引率

6.70%

发文量

358

审稿时长

7 weeks

期刊介绍： Nanophotonics, published in collaboration with Sciencewise, is a prestigious journal that showcases recent international research results, notable advancements in the field, and innovative applications. It is regarded as one of the leading publications in the realm of nanophotonics and encompasses a range of article types including research articles, selectively invited reviews, letters, and perspectives. The journal specifically delves into the study of photon interaction with nano-structures, such as carbon nano-tubes, nano metal particles, nano crystals, semiconductor nano dots, photonic crystals, tissue, and DNA. It offers comprehensive coverage of the most up-to-date discoveries, making it an essential resource for physicists, engineers, and material scientists.