论文标题
在Anapole状态附近的全dilectric高索引纳米风险阵列的光学Kerr非线性
Optical Kerr nonlinearity of arrays of all-dielectric high index nanodisks in the vicinity of the anapole state
论文作者
论文摘要
高索引纳米颗粒的非线性光学性质在Anapole状态下增强。研究人员深入研究这种现象是各种应用的希望。在这项工作中，研究了间隙纳米虫的无序和平方晶格跨度的非线性光学KERR效应，作为在532 nm波长的Anapole状态附近的磁盘大小的函数。当纳米风险的大小接近Anapole状态时，元图的有效二阶折射率呈指数增加。接近Anapole状态时，有效的二阶折射率的迹象被倒置。平方晶格跨面的有效非线性KERR系数的绝对值高于纳米界无序阵列的绝对值。在靠近Anapole状态的有效二阶折叠指数的绝对值比在非动脉噪声谐振的纳米风险或球体组成的无障碍共振下高的数量级高。
The nonlinear optical properties of the high index nanoparticles are boosted at the anapole state. Researchers intensively study this phenomenon as promising for various applications. In this work, the nonlinear optical Kerr effect of disordered and square lattice metasurfaces of GaP nanodisks is investigated as a function of the disk size in the vicinity of the anapole state at the wavelength of 532 nm. When the sizes of the nanodisks are close to the anapole state, the effective second order refractive index of the metasurface increases exponentially. On approaching the anapole state, the sign of the effective second order refractive index is inverted. The absolute value of the effective nonlinear Kerr coefficient of the square lattice metasurface is higher than that of the disordered array of nanodisks. The absolute value of the effective second order refractive index in proximity to the anapole state is an order of magnitude higher than that at non-anapole resonances of the disordered metasurfaces consisting of the nanodisks or spheres.
