Ultrafast all-optical switching enabled by epsilon-near-zero-tailored absorption in metal-insulator nanocavities
Ultrafast all-optical switching enabled by epsilon-near-zero-tailored absorption in metal-insulator nanocavities
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DOI：
10.1038/s42005-020-0379-2
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发表时间：
2020-06-24
影响因子：
5.5
通讯作者：
Maccaferri, Nicolo
中科院分区：
文献类型：
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作者：
Kuttruff, Joel;Garoli, Denis;Maccaferri, Nicolo
鉴于信息处理的新技术前沿，光-物质相互作用的超快控制是基本的。然而，传统的光学元件要么是静态的，要么具有相对于能够控制光的时间尺度而言极低的切换速度。在这里，我们利用金属-绝缘体-金属纳米腔的人工ε近零（ENZ）模式来定制我们系统的线性光子吸收，并实现在特定波长处反射率的非简并全光超快调制。在其高能量ENZ模式的系统的光泵浦导致一个强烈的红移的低能量模式，因为局部介电函数的瞬态增加，这导致在一个特定的波长与相对调制深度接近120%的子3-ps的反射率控制。
Ultrafast control of light-matter interactions is fundamental in view of new technological frontiers of information processing. However, conventional optical elements are either static or feature switching speeds that are extremely low with respect to the time scales at which it is possible to control light. Here, we exploit the artificial epsilon-near-zero (ENZ) modes of a metal-insulator-metal nanocavity to tailor the linear photon absorption of our system and realize a nondegenerate all-optical ultrafast modulation of the reflectance at a specific wavelength. Optical pumping of the system at its high energy ENZ mode leads to a strong redshift of the low energy mode because of the transient increase of the local dielectric function, which leads to a sub-3-ps control of the reflectance at a specific wavelength with a relative modulation depth approaching 120%.