论文标题
通过在连续体中极敏感的结合状态启用的全dilectric metasurfaces的高谐波产生的强劲增强
Robust enhancement of high-harmonic generation from all-dielectric metasurfaces enabled by polarization-insensitive bound states in the continuum
论文作者
论文摘要
新兴的全dielectric平台表现出受连续体（BIC）物理学的高质量共振（$ Q $）共振，这些谐振（BIC）驱动了高效的非线性光学过程。在这里，我们证明了由四个由四个硅纳米虫组成的全dilectric MetaSurfaces的第三（THG）和第五谐波生成（FHG）的强大增强。通过对称性破坏，真正的BIC转换为高Q $ q $ quasi-bic共振，并具有紧密的场合限制，以创纪录的高效率为$ 3.9 \ times10^{ - 4} $ w $^{ - 2} $ and fhg效率和fhg的效率，$ 4.8 \ times10^\ times10^{ - 10} $ w $ w $ w $ w $ w $^$^$ pupter gw/cm $^{2} $。此外，由于特殊的$ c_ {4} $元原子的布置，准键和共响增强的谐波表现出对极化的不敏感特征。我们的结果暗示了智能设计有效，强大的非线性纳米光子设备的方法。
The emerging all-dielectric platform exhibits high-quality ($Q$) resonances governed by the physics of bound states in the continuum (BIC) that drives highly efficient nonlinear optical processes. Here we demonstrate the robust enhancement of third-(THG) and fifth-harmonic generation (FHG) from all-dielectric metasurfaces composed of four silicon nanodisks. Through the symmetry breaking, the genuine BIC transforms into the high-$Q$ quasi-BIC resonance with tight field confinement for record high THG efficiency of $3.9\times10^{-4}$ W$^{-2}$ and FHG efficiency of $4.8\times10^{-10}$ W$^{-4}$ using a moderate pump intensity of 1 GW/cm$^{2}$. Moreover, the quasi-BIC and the resonantly enhanced harmonics exhibit polarization-insensitive characteristics due to the special $C_{4}$ arrangement of meta-atoms. Our results suggest the way for smart design of efficient and robust nonlinear nanophotonic devices.
