论文标题
超快多层epsilon-near-Zero零材料中的热电子动力学
Hot Electron Dynamics in Ultrafast Multilayer Epsilon-Near-Zero Metamaterial
论文作者
论文摘要
在不牺牲速度的情况下实现光学特性的显着可调性对于获得所有光学超快设备至关重要。在这项工作中，我们研究了在可见光频谱范围内运行的光学上可调节的Epsilon-Near-near-Zero（ENZ）超材料的超快时间行为。为了执行此操作，热电子的超快速动力学是通过飞秒泵探针光谱获得的，并基于两个温度模型（2TM）进行了研究。我们表明，用飞秒脉冲抽水会改变超材料的有效介电常数超过400％。这种重要的调制在ENZ区域更为明显，我们通过2TM来确认这一点。实现的有效介电常数的超快调制，以及3.3 PS的超短松弛时间，为超快光子应用开辟了新的途径。
Realizing remarkable tunability in optical properties without sacrificing speed is critical to obtain all optical ultrafast devices. In this work, we investigate the ultrafast temporal behavior of optically tunable epsilon-near-zero (ENZ) metamaterials, operating in the visible spectral range. To perform this the ultrafast dynamics of the hot electrons is acquired by femtosecond pump-probe spectroscopy and studied based on two-temperature model (2TM). We show that pumping with femtosecond pulses changes the effective permittivity of the metamaterial more than 400 %. This significant modulation is more pronounced in ENZ region and we confirm this by the 2TM. The realized ultrafast modulation in effective permittivity, along with the ultrashort relaxation time of 3.3 ps, opens a new avenue towards ultrafast photonic applications.
