Second-harmonic generation of trapezoidal grating lithium niobate films based on quasi-bound states in the continuous

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications Pub Date : 2025-04-11 DOI:10.1016/j.optcom.2025.131843

Shuangshuang Hui , Shuwen Cui , Junjie Zhang , Jicheng Wang

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引用次数: 0

Abstract

Optical second harmonics (SH) has important applications in many fields, such as micro-imaging techniques and extending the wavelength band of laser light sources. Lithium niobate (LiNbO₃) can achieve a high SH conversion efficiency by its large second-order nonlinear coefficient. Conventional LiNbO₃ devices require long interaction lengths and meet phase matching requirements. Thin-film lithium niobium oxide enables better optical mode confinement and improves SH conversion efficiency. A distributed Bragg reflection trapezoidal grating SH- conversion device based on quasi-bound states of continuous LiNbO₃ thin films is designed. The device can generate narrow-band resonances with five high Q-factors over a broadband width of 500–800 nm. Based on the multistage expansion algorithm and the magnetic field map obtained by simulation, a suitable resonant mode is selected to obtain a higher SH generation efficiency. By rationally designing the structural parameters of the device as well as the incident light intensity, a high SH generation efficiency of up to 3.35 × 10⁻³ can be obtained. As a result, our devices are designed for high efficiency, low loss and multi-band SH generation devices.

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基于准束缚态的梯形光栅铌酸锂薄膜的二次谐波生成

光次谐波在微成像技术和延长激光光源波段等领域有着重要的应用。铌酸锂（LiNbO3）具有较大的二阶非线性系数，可实现较高的SH转化效率。传统的LiNbO3器件需要较长的相互作用长度和满足相位匹配要求。薄膜氧化铌锂可以实现更好的光学模式约束和提高SH转换效率。设计了一种基于连续LiNbO3薄膜准束缚态的分布式布拉格反射梯形光栅SH-转换装置。该装置可以在500-800纳米的宽带宽度上产生具有5个高q因子的窄带共振。在多级展开算法的基础上，结合仿真得到的磁场图，选择合适的谐振模式，获得更高的SH产生效率。通过合理设计器件的结构参数和入射光强，可获得高达3.35 × 10−3的高SH产生效率。因此，我们的器件设计用于高效率，低损耗和多频段SH产生器件。

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.