Efficient second-harmonic generation in a lithium niobate metasurface governed by high-Q magnetic toroidal dipole resonances.

IF 3.1 2区物理与天体物理 Q2 OPTICS

Optics letters Pub Date : 2024-10-01 DOI:10.1364/OL.533402

Hong Duan, Haoxuan He, Yingfei Yi, Lulu Wang, Ying Zhang, Shaojun You, Yiyuan Wang, Chenggui Gao, Jing Huang, Chaobiao Zhou

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引用次数: 0

Abstract

Lithium niobate (LN) is an excellent nonlinear optical material due to its large nonlinear coefficient, low loss, and broad optical transparency window. So, it is widely used in the generation of nonlinear harmonics. Magnetic toroidal dipole (MTD) resonance is a special optical resonance mode, which can effectively localize the light field inside the device, thus enhancing the nonlinear effects of the materials. In this work, we numerically study the second-harmonic generation (SHG) effect of the LN metasurface based on the MTD mode with a high quality factor (Q-factor). The designed LN nanorod dimer metasurface supports high Q-factor MTD guided mode resonances (GMRs), which are excited by varying the center spacing of the two nanorods, and the Q-factor can be controlled by the offset distance. The excited MTD can effectively confine the electric field within the device, which enables the LN metasurface SHG conversion efficiency to reach 1.15 × 10^-2. In addition, by adjusting the structural parameters, it is possible to effectively modulate the wavelength and conversion efficiency of the SHG. Our results provide a new route for high-quality nonlinear light sources.

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由高 Q 磁环偶极共振控制的铌酸锂超表面中的高效二次谐波生成。

铌酸锂（LN）具有非线性系数大、损耗低、光学透明窗口宽等特点，是一种优良的非线性光学材料。因此，它被广泛应用于非线性谐波的产生。磁环偶极子（MTD）共振是一种特殊的光学共振模式，它能有效地将光场定位在器件内部，从而增强材料的非线性效应。在这项工作中，我们基于高品质因数（Q 因子）的 MTD 模式，对 LN 元表面的二次谐波发生（SHG）效应进行了数值研究。所设计的 LN 纳米棒二聚体元表面支持高 Q 因子 MTD 导向模共振（GMR），通过改变两个纳米棒的中心间距可以激发 GMR，Q 因子可由偏移距离控制。被激发的 MTD 可以有效地限制器件内的电场，从而使 LN 超表面 SHG 转换效率达到 1.15 × 10-2。此外，通过调整结构参数，还可以有效调节 SHG 的波长和转换效率。我们的研究成果为高质量非线性光源提供了一条新途径。

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

Optics letters 物理-光学

CiteScore

6.60

自引率

8.30%

发文量

2275

审稿时长

1.7 months

期刊介绍： The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community. Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.