在共振过渡金属二卤化物纳米盘中兼具超高指数和非线性特性

IF 32.3 1区 物理与天体物理 Q1 OPTICS Nature Photonics Pub Date : 2024-06-13 DOI:10.1038/s41566-024-01444-9
George Zograf, Alexander Yu. Polyakov, Maria Bancerek, Tomasz J. Antosiewicz, Betül Küçüköz, Timur O. Shegai
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摘要

固体中的二阶非线性产生了大量独特的物理现象,从压电和光学整流到光学参量放大、自发参量下变频以及纠缠光子对的产生。单层过渡金属二钙化物(如 MoS2)是已知二阶非线性系数最高的材料之一。然而,由于这些材料的单层特性,无法完全利用材料本身制造共振物体,因此必须使用外部结构来实现非线性过程的光学增强。在这里,我们利用二硫化钼多层材料的 3R 相来实现共振非线性纳米光子学。由于缺乏反转对称性--即使在材料的主体中也是如此--因此在近红外区域(n > 4.5),3R-MoS2 结合了巨大的二阶易感性、极高的各向异性折射率和低吸收损耗,这使得 3R-MoS2 对非线性纳米光子学极具吸引力。我们通过制造不同半径的 3R-MoS2 纳米盘来证明这一点,这些纳米盘支持共振无极态,与相同厚度的无图案薄片相比,我们观察到单个共振纳米盘中的二次谐波发生率大幅提高(100 倍)。在圆盘的无极态与二阶易感性的材料共振之间的光谱重叠处,这种增强达到了最大程度。我们的方法揭示了增强纳米结构范德华材料中整个光学二阶非线性过程光谱的有力工具,从而为非线性和量子高指数过渡金属二掺杂纳米光子学铺平了道路。
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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Combining ultrahigh index with exceptional nonlinearity in resonant transition metal dichalcogenide nanodisks
Second-order nonlinearity in solids gives rise to a plethora of unique physical phenomena ranging from piezoelectricity and optical rectification to optical parametric amplification, spontaneous parametric down-conversion and the generation of entangled photon pairs. Monolayer transition metal dichalcogenides, such as MoS2, exhibit one of the highest known second-order nonlinear coefficients. However, the monolayer nature of these materials prevents the fabrication of resonant objects exclusively from the material itself, necessitating the use of external structures to achieve the optical enhancement of nonlinear processes. Here we exploit the 3R phase of a molybdenum disulfide multilayer for resonant nonlinear nanophotonics. The lack of inversion symmetry—even in the bulk of the material—provides a combination of massive second-order susceptibility, extremely high and anisotropic refractive index in the near-infrared region (n > 4.5) and low absorption losses, making 3R-MoS2 highly attractive for nonlinear nanophotonics. We demonstrate this by fabricating 3R-MoS2 nanodisks of various radii, which support resonant anapole states, and observing substantial (>100-fold) enhancement of second-harmonic generation in a single resonant nanodisk compared with an unpatterned flake of the same thickness. The enhancement is maximized at the spectral overlap between the anapole state of the disk and the material resonance of the second-order susceptibility. Our approach unveils a powerful tool for enhancing the entire spectrum of optical second-order nonlinear processes in nanostructured van der Waals materials, thereby paving the way for nonlinear and quantum high-index transition metal dichalcogenide nanophotonics. Using the 3R phase of molybdenum disulfide nanodisks with various radii, more than 100-fold enhancement of second-harmonic generation can be obtained in a single resonant nanodisk compared with an unpatterned flake of the same thickness.
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来源期刊
Nature Photonics
Nature Photonics 物理-光学
CiteScore
54.20
自引率
1.70%
发文量
158
审稿时长
12 months
期刊介绍: Nature Photonics is a monthly journal dedicated to the scientific study and application of light, known as Photonics. It publishes top-quality, peer-reviewed research across all areas of light generation, manipulation, and detection. The journal encompasses research into the fundamental properties of light and its interactions with matter, as well as the latest developments in optoelectronic devices and emerging photonics applications. Topics covered include lasers, LEDs, imaging, detectors, optoelectronic devices, quantum optics, biophotonics, optical data storage, spectroscopy, fiber optics, solar energy, displays, terahertz technology, nonlinear optics, plasmonics, nanophotonics, and X-rays. In addition to research papers and review articles summarizing scientific findings in optoelectronics, Nature Photonics also features News and Views pieces and research highlights. It uniquely includes articles on the business aspects of the industry, such as technology commercialization and market analysis, offering a comprehensive perspective on the field.
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