论文标题
超快的全光开关由金属绝缘体纳米腔中的epsilon-near-Zero模式启用
Ultrafast all-optical switching enabled by epsilon-near-zero modes in metal-insulator nanocavities
论文作者
论文摘要
鉴于新的信息处理的新技术前沿，对光 - 物质相互作用的超快控制构成了至关重要的特征。但是，传统的光学元素是静态或特征开关速度，相对于可以控制光的时间尺度，它们极低。在这里，我们利用金属 - 绝缘子 - 金属纳米腔的高质量工程EPSILON-NEAR-NEAR-ZERO（ENZ）模式，以实现对量身定制波长的光反射的全光超试剂调制。我们的方法基于两者的存在，频谱分离的腔吸收共振。由于局部介电函数的瞬时增加，该系统在其高能ENZ模式下的光学泵送导致低能模式的强红移，这导致在特定波长下对反射率的低于3-PS的控制，其相对调制深度接近120％。
Ultrafast control of light-matter interactions constitutes a crucial feature 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 timescales at which it is possible to control light. Here, we exploit high-quality-factor engineered epsilon-near-zero (ENZ) modes of a metal-insulator-metal nanocavity to realize an all-optical ultrafast modulation of the reflectance of light at a tailored wavelength. Our approach is based on the presence of the two, spectrally separated, ENZ absorption resonances of the cavity. Optical pumping of the system at its high energy ENZ mode leads to a strong red-shift 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%.
