Polarization-Independent Large Third-Order-Nonlinearity of Orthogonal Nanoantennas Coupled to an Epsilon-Near-Zero Material.
Polarization-Independent Large Third-Order-Nonlinearity of Orthogonal Nanoantennas Coupled to an Epsilon-Near-Zero Material.
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与 Epsilon 近零材料耦合的正交纳米天线的与偏振无关的大三阶非线性
DOI：
10.3390/nano11123424
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发表时间：
2021-12-17
期刊：
影响因子：
--
通讯作者：
Wang Z
中科院分区：
文献类型：
--
作者：
Shi W;Liu H;Wang Z
普通材料的非线性光学响应受到带宽和能量消耗的限制，阻碍了其在全光信号处理、光探测、谐波产生等领域的实际应用。为了规避这一限制，我们提出，正交纳米天线耦合到铝掺杂氧化锌（AZO）ε近零（ENZ）材料显示宽带（~1000 nm带宽）大的光学非线性同时为两个正交的偏振态。非线性折射率n2的绝对最大值为7.65 cm 2·GW-1，比裸AZO膜大4个数量级，比二氧化硅大7个数量级。该耦合结构不仅实现了偏振无关和强非线性，而且允许灵活地调整非线性响应的符号。它为在纳米尺度上实现超紧凑、低功耗、高非线性的全光器件提供了一个很有前途的平台。
The nonlinear optical response of common materials is limited by bandwidth and energy consumption, which impedes practical application in all-optical signal processing, light detection, harmonic generation, etc. Additionally, the nonlinear performance is typically sensitive to polarization. To circumvent this constraint, we propose that orthogonal nanoantennas coupled to Al-doped zinc oxide (AZO) epsilon-near-zero (ENZ) material show a broadband (~1000 nm bandwidth) large optical nonlinearity simultaneously for two orthogonal polarization states. The absolute maximum value of the nonlinear refractive index n2 is 7.65 cm2∙GW−1, which is 4 orders of magnitude larger than that of the bare AZO film and 7 orders of magnitude larger than that of silica. The coupled structure not only realizes polarization independence and strong nonlinearity, but also allows the sign of the nonlinear response to be flexibly tailored. It provides a promising platform for the realization of ultracompact, low-power, and highly nonlinear all-optical devices on the nanoscale.
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