arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.01148physics.optics
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利用全介质超表面增强气体谐波产生

Enhanced Harmonic Generation in Gases Using an All-Dielectric Metasurface

Jared S. Ginsberg, Adam C. Overvig, M. Mehdi Jadidi, Stephanie C. Malek, Gauri N. Patwardhan, Nicolas Swenson, Nanfang Yu, Alexander L. Gaeta

摘要:

强场约束,长寿命的共振,和慢光效应表明,Meta表面是一个有前途的工具,非线性光学应用。这些纳米结构的器件已被用于相对高效率的固态高次谐波产生平台、四波混频和拉曼散射实验等。在这里,我们报告的第一个全电介质超颖表面,以提高谐波产生从周围的气体,实现高达45的因素增加氩原子的总产量。当与金属纳米结构相比时,对于高功率应用(例如使用原子气体的应用),纳米结构更鲁棒地抵抗损坏。我们采用二聚高对比度光栅制造的绝缘体上的硅,支持束缚态的连续,一个共振功能可在破缺对称平面设备。我们的1D光栅保持大的模式体积,克服了早期设备设计的更严重的限制之一,并大大有助于增强三次和五次谐波产生。可以实现的相互作用长度也明显大于早期固态设计所限制的10 nm。我们进行时域有限差分模拟,充分表征的波长,线宽,模式分布,和偏振依赖的共振。我们的实验证实了这些预测,并与其他非线性光学性质是一致的。我们在这些设备中展示的可调谐波长依赖性和质量因子控制使它们成为下一代高谐波源的有吸引力的工具,这些高谐波源预计将以更长的波长和更低的峰值功率,更高的重复率激光器进行泵浦。

英文摘要:

Strong field-confinement, long-lifetime resonances, and slow-light effects suggest that meta surfaces are a promising tool for nonlinear optical applications. These nanostructured devices have been utilized for relatively high efficiency solid-state high-harmonic generation platforms, four-wave mixing, and Raman scattering experiments, among others. Here we report the first all-dielectric metasurface to enhance harmonic generation from a surrounding gas, achieving as much as a factor of 45 increase in the overall yield for Argon atoms. When compared to metal nanostructures, dielectrics are more robust against damage for high power applications such as those using atomic gases. We employ dimerized high-contrast gratings fabricated in silicon-on-insulator that support bound states in the continuum, a resonance feature accessible in broken-symmetry planar devices. Our 1D gratings maintain large mode volumes, overcoming one of the more severe limitations of earlier device designs and greatly contributing to enhanced third- and fifth- harmonic generation. The interaction lengths that can be achieved are also significantly greater than the 10's of nm to which earlier solid-state designs were restricted. We perform finite-difference time-domain simulations to fully characterize the wavelength, linewidth, mode profile, and polarization dependence of the resonances. Our experiments confirm these predictions and are consistent with other nonlinear optical properties. The tunable wavelength dependence and quality-factor control we demonstrate in these devices make them an attractive tool for the next generation of high-harmonic sources, which are anticipated to be pumped at longer wavelengths and with lower peak power, higher repetition rate lasers.

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