Controlling hybrid nonlinearities in transparent conducting oxides via two-colour excitation.
Controlling hybrid nonlinearities in transparent conducting oxides via two-colour excitation.
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DOI：
10.1038/ncomms15829
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发表时间：
2017-06-09
影响因子：
16.6
通讯作者：
Ferrera M
中科院分区：
文献类型：
--
作者：
Clerici M;Kinsey N;DeVault C;Kim J;Carnemolla EG;Caspani L;Shaltout A;Faccio D;Shalaev V;Boltasseva A;Ferrera M
纳米光子学和超材料已经彻底改变了我们对光学空间（ε，μ）的看法，使我们能够几乎随意地设计折射率，将光限制在最小的体积内，并以极小的足迹和能量需求操纵光信号。目前，人们正致力于寻找合适的材料和策略来动态控制光学特性。透明导电氧化物在带间和带内激发下表现出很大的超快非线性。在这里，我们表明，通过双色激光场在铝掺杂氧化锌中结合这两种效应，揭示了新的材料功能。由于两个非线性的独立性，可以通过作用于两个场的振幅和延迟来设计材料介电常数的超快时间动力学。我们展示了这种新的自由度的潜在应用，通过动态解决的调制带宽和光谱调谐的探测光脉冲。超材料使光学特性的定制工程成为可能。在这里，Clerici等人表明，透明导电氧化物中独立的带间和带内非线性允许对折射率的真实的和虚部进行动态光学控制。
Nanophotonics and metamaterials have revolutionized the way we think about optical space (ε,μ), enabling us to engineer the refractive index almost at will, to confine light to the smallest of the volumes, and to manipulate optical signals with extremely small footprints and energy requirements. Significant efforts are now devoted to finding suitable materials and strategies for the dynamic control of the optical properties. Transparent conductive oxides exhibit large ultrafast nonlinearities under both interband and intraband excitations. Here we show that combining these two effects in aluminium-doped zinc oxide via a two-colour laser field discloses new material functionalities. Owing to the independence of the two nonlinearities, the ultrafast temporal dynamics of the material permittivity can be designed by acting on the amplitude and delay of the two fields. We demonstrate the potential applications of this novel degree of freedom by dynamically addressing the modulation bandwidth and optical spectral tuning of a probe optical pulse. Metamaterials have enabled the tailored engineering of optical properties. Here, Clerici et al. show that independent interband and intraband nonlinearities in transparent conducting oxides allow dynamic optical control of the real and imaginary parts of the refractive index.