Efficient third harmonic generation in an all-dielectric metasurface based on tunable bound states in the continuum

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications Pub Date : 2024-10-30 DOI:10.1016/j.optcom.2024.131258

Zhuoyue Sun , Xinrui Du , Wenqian Yuan , Xinyu Wang , Feng Xia , Mei Wang , Peng Sun , Li Dong , Maojin Yun

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引用次数: 0

Abstract

Metasurfaces provide opportunities to enhance nonlinear optical processes. In this paper, we present a nonlinear all-dielectric metasurface with high-quality-factor (high-Q-factor) resonant modes in the vicinity of bound states in a continuum (BICs) to enhance the conversion efficiency of third-harmonic generation (THG). By breaking the symmetry of the metasurface, a quasi-BIC (Q-BIC) with finite lifetimes and large Q factors can be excited and the localized field can be significantly enhanced. Such distinctive-mode engineering yielded a THG conversion efficiency of 3.98% at a pump power of 1 MW/cm². In addition, compared with previous studies, the THG conversion efficiency, the switch between single and dual modes of can be dynamically tuned by adjusting the asymmetry parameter Δr, the polarization angle of the incident light, and the height of the silicon nanopillar. The results of this study offer insight into harmonic generation at the nanoscale level.

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基于连续体中可调束缚态的全介质元表面中的高效三次谐波生成

元表面为增强非线性光学过程提供了机会。在本文中，我们提出了一种非线性全介质元表面，它在连续体中的束缚态（BICs）附近具有高品质因数（high-Q-factor）谐振模式，从而提高了三次谐波发生（THG）的转换效率。通过打破元表面的对称性，可以激发具有有限寿命和大 Q 因子的准 BIC（Q-BIC），从而显著增强局部场。在泵功率为 1 MW/cm2 的条件下，这种独特的模式工程产生了 3.98% 的 THG 转换效率。此外，与之前的研究相比，通过调整不对称参数Δr、入射光的偏振角和硅纳米柱的高度，可以动态调整 THG 转换效率、单模和双模之间的切换。这项研究的结果为纳米级谐波生成提供了深入的见解。

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 Communications 物理-光学

CiteScore

5.10

自引率

8.30%

发文量

681

审稿时长

38 days

期刊介绍： Optics Communications invites original and timely contributions containing new results in various fields of optics and photonics. The journal considers theoretical and experimental research in areas ranging from the fundamental properties of light to technological applications. Topics covered include classical and quantum optics, optical physics and light-matter interactions, lasers, imaging, guided-wave optics and optical information processing. Manuscripts should offer clear evidence of novelty and significance. Papers concentrating on mathematical and computational issues, with limited connection to optics, are not suitable for publication in the Journal. Similarly, small technical advances, or papers concerned only with engineering applications or issues of materials science fall outside the journal scope.