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arXiv 2102.13087physics.opticsphysics.app-ph
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纳米非线性光学用全介质各向异性超材料粒子的光限制

Confining light in all-dielectric anisotropic metamaterial particles for nano-scale nonlinear optics

Saman Jahani, Joong Hwan Bahng, Arkadev Roy, Nicholas Kotov, Alireza Marandi

摘要:

高折射率介质可以将光限制在纳米尺度,从而增强非线性响应。然而,在这些介质中增加的动量会恶化不同谐波之间的重叠,这在缺乏动量匹配的情况下阻碍了波长级谐振器中的有效非线性相互作用。在这里,我们提出了一种替代方法,在各向异性粒子的光限制。各向异性介质中的额外自由度允许我们独立地控制中心附近的倏逝波和远离中心的径向动量。这可以导致强的光限制以及不同谐波之间的优异的场重叠,这对于非线性波长转换是理想的。控制倏逝场也有助于超越各向同性介质天线对辐射带宽的限制。这可以改善光耦合到这些颗粒中,这对于纳米尺度的非线性光学至关重要。我们估计的二次谐波产生效率,以及光学参量振荡阈值在这些粒子中显示这些粒子的强非线性响应,即使远离中心的共振。我们的方法是有前途的实验实现,并可用于许多应用,如大规模并行传感和计算。

英文摘要:

High-index dielectrics can confine light into nano-scale leading to enhanced nonlinear response. However, increased momentum in these media can deteriorate the overlap between different harmonics which hinders efficient nonlinear interaction in wavelength-scale resonators in the absence of momentum matching. Here, we propose an alternative approach for light confinement in anisotropic particles. The extra degree of freedom in anisotropic media allows us to control the evanescent waves near the center and the radial momentum away from the center, independently. This can lead to a strong light confinement as well as an excellent field overlap between different harmonics which is ideal for nonlinear wavelength conversion. Controlling the evanescent fields can also help to surpass the constrains on the radiation bandwidth of isotropic dielectric antennas. This can improve the light coupling into these particles, which is crucial for nano-scale nonlinear optics. We estimate the second-harmonic generation efficiency as well as optical parametric oscillation threshold in these particles to show the strong nonlinear response in these particles even away from the center of resonances. Our approach is promising to be realized experimentally and can be used for many applications, such as large-scale parallel sensing and computing.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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