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Efficient second-harmonic generation in high Q-factor asymmetric lithium niobate metasurfaces

机译:高Q因子不对称锂铌酸盐元胶中的高效二次谐波产生

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摘要

Lithium niobate (LN) has been widely used for second-harmonic generation (SHG) from bulk crystals. Recent studies have reported improved SHG efficiency in LN microring resonators and hybrid waveguiding structures, as well as in LN nanostructures supporting anapole modes and plasmon-assisted dipole resonances. Here we numerically demonstrate that high Q-factor resonances associated with symmetry-protected bound states in the continuum can lead to highly efficient frequency doubling in LN metasurfaces. Simulations show that the radiative Q-factor and on-resonance field enhancement factor observed in the meta-surface are closely dependent on the asymmetric parameter alpha of the system. Furthermore, high Q-factor resonances boost the SH conversion process in the LN nanostructures. In particular, for a LN metasurface with a Q-factor of similar to 8 x 10(4), a 0.49% peak SH conversion efficiency is achieved at a pump intensity of 3.3 kW/cm(2). This suggests that such high Q-factor LN metasurfaces may be good candidates for practical blue-ultraviolet light sources. Our work provides insight into the possible implementation of metadevices based on nanoengineering of conventional nonlinear crystals. (C) 2021 Optical Society of America
机译:铌酸锂(LN)被广泛用于大块晶体的二次谐波产生。最近的研究表明,在LN微环谐振器和混合波导结构中,以及在支持回极模式和等离子体辅助偶极共振的LN纳米结构中,提高了倍频效率。在这里,我们用数值方法证明了与连续体中对称保护束缚态相关的高Q因子共振可以导致LN超表面中的高效倍频。模拟结果表明,在元表面观察到的辐射Q因子和共振场增强因子与系统的不对称参数α密切相关。此外,高Q因子共振促进了LN纳米结构中的SH转换过程。特别是,对于Q因子类似于8 x 10(4)的LN超表面,在3.3 kW/cm(2)的泵浦强度下,可实现0.49%的峰值SH转换效率。这表明,这种高Q因子LN亚表面可能是实用蓝紫外光源的良好候选。我们的工作为基于传统非线性晶体纳米工程的超器件的可能实现提供了见解。(2021)美国光学学会

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  • 来源
    《Optics Letters》 |2021年第3期|共4页
  • 作者单位

    Penn State Univ Dept Elect Engn University Pk PA 16802 USA;

    Penn State Univ Dept Elect Engn University Pk PA 16802 USA;

    Penn State Univ Dept Elect Engn University Pk PA 16802 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 计量学;光学;
  • 关键词

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