Controlling anisotropy of dielectrics by an ultrashort double-pulse laser
Controlling anisotropy of dielectrics by an ultrashort double-pulse laser
复制标题
用超短双脉冲激光控制电介质的各向异性
DOI：
10.1088/1361-6463/aae9be
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Jiang Lan
中科院分区：
文献类型：
--
作者：
Zhang Xiaoqin;Wang Feng;Wang Xiaoli;Jiang Lan
基于实时含时密度泛函理论，研究了超短双脉冲激光对双光子晶体光学响应的控制。以金刚石为例，我们展示了专门设计的双脉冲激光器在操纵金刚石的强各向异性方面的独特能力，与单脉冲激光器相比，取得了显着的好处。由于激光参数容易调谐，在脉冲激光的某些时间点，对于特定的光频率，介质材料甚至可以通过各向同性、椭圆和双曲线的反转来切换。我们描述了在整个脉冲激光的持续时间，它可以表现出可逆的，但深度非线性修改的光学响应由一个专门设计的脉冲激光驱动，而不施加物理损伤的瞬态介电常数的演变，展示了超快全光信号处理和光场效应器件的应用的基本可能性。
We theoretically investigate the control of optical responses of dielectrics by an ultrashort double-pulse laser, based on the real-time time-dependent density functional theory. Taking the diamond as a concrete example, we demonstrate the unique capability of a purposely designed double-pulse laser in manipulating the strong anisotropy of dielectrics, achieving significant benefits compared with a single-pulse laser. With easily tunable laser parameters, the dielectric material can even be switched by reversal of isotropic, elliptic and hyperbolic for a particular light frequency at certain time points during the pulse laser. We describe the evolution of the transient permittivity throughout the duration of the pulse laser, which can exhibit reversible but deeply nonlinear modification in optical responses driven by a purposely designed pulse laser without imposing physical damage, demonstrating a fundamental possibility for applications of ultrafast all-optical signal processing and optical-field effect devices.