用于高效紫外谐波产生的钽酸锂谐振超表面

IF 11.9 1区 物理与天体物理 Q1 PHYSICS, APPLIED
Siying Gao, Zhuoqun Wang, Ning Lu, Lei Xu, Zhanghua Han, Mohsen Rahmani, Yuechen Jia, Feng Chen
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引用次数: 0

摘要

钽酸锂(LiTaO3, LT)结构类似于铌酸锂,具有广泛的光电特性,在集成光子学应用中具有重要的前景。由于其更大的带隙和更高的光损伤阈值,可用于紫外波长范围内的高效非线性光频率转换。在这里,我们报道了单片高质量LT超表面的制造,由LT截断方形金字塔的周期性阵列组成,通过使用聚焦离子束铣削工艺对LT薄膜层进行部分蚀刻而成。这些金字塔结构引入了离散的平移对称性,这使得导模色散折叠到第一布里渊区,从而形成具有q因子的导模共振,这可以很容易地通过LT金字塔的高度来控制。测量结果表明,在786 nm处,q因子高达约640。通过利用这些高q共振的强场局域化,我们证明了在393 nm处增强的二次谐波产生,绝对转换效率为0.042%,为介电超表面的紫外谐波产生建立了新的基准。此外,我们的制造技术可以很容易地适应于广泛的其他材料平台,为开发高质量的UV超表面和先进的非线性光子元器件开辟了新的途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Lithium tantalate resonant metasurfaces for highly efficient ultraviolet harmonic generation
Lithium tantalate (LiTaO3, LT), structurally similar to lithium niobate, possesses a broad spectrum of optoelectronic properties that hold significant promise for integrated photonics applications. Due to its larger bandgap and higher optical damage threshold, LT can be employed for efficient nonlinear optical frequency conversion in the ultraviolet (UV) wavelength range. Here, we report on fabrication of monolithic, high-quality LT metasurfaces, composed of periodic arrays of LT truncated square pyramids, created by partially etching of a LT thin film layer using a focused ion beam milling process. These pyramidal structures introduce discrete translational symmetry, which allows for the folding of guided-mode dispersion into the first Brillouin zone, leading to the formation of guided mode resonances with Q-factors that can be easily controlled by the height of LT pyramids. The measurements show a Q-factor up to approximately 640 at 786 nm. By leveraging the strong field localization of these high-Q resonances, we demonstrate enhanced second-harmonic generation at 393 nm with an absolute conversion efficiency of 0.042%, establishing a new benchmark for the UV harmonic generation in dielectric metasurfaces. Moreover, our fabrication technique can be readily adapted to a wide range of other material platforms, opening new avenues for the development of high-quality UV metasurfaces and advanced nonlinear photonic meta-devices.
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来源期刊
Applied physics reviews
Applied physics reviews PHYSICS, APPLIED-
CiteScore
22.50
自引率
2.00%
发文量
113
审稿时长
2 months
期刊介绍: Applied Physics Reviews (APR) is a journal featuring articles on critical topics in experimental or theoretical research in applied physics and applications of physics to other scientific and engineering branches. The publication includes two main types of articles: Original Research: These articles report on high-quality, novel research studies that are of significant interest to the applied physics community. Reviews: Review articles in APR can either be authoritative and comprehensive assessments of established areas of applied physics or short, timely reviews of recent advances in established fields or emerging areas of applied physics.
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