论文标题
倾斜光的极化平面可在空间上分离超快时间标准上手性分子的非线性光学响应
Tilting light's polarization plane to spatially separate the nonlinear optical response of chiral molecules on ultrafast timescales
论文作者
论文摘要
区分手性分子的左手和右手版本（对映异构体）至关重要，但本质上也很困难。传统的光学方法使用椭圆形或循环极化的光依赖于弱线性效应，而弱线性效应超出了电动偶极近似，这对解决超快手性分子动力学的时间构成了主要局限性。在这里，我们展示了如何通过倾斜极度椭圆极化光线的极化平面，向其传播方向倾斜，我们可以将光场变成一个高效的chiro光学工具。可以通过紧密聚焦梁，创建结构化的光线来实现这种“正向倾斜”，从而在空间中表现出非平凡的极化模式。我们证明，我们的结构化场使我们能够实现一个干涉仪，以进行有效的手性识别，从而将左手和右手分子在空间中的非线性光学响应分开。我们的工作提供了一种简单但高效的方式，可以在空间上构建光到图像分子手性的极化，具有极端的对映激素和超快时间尺度。
Distinguishing between the left- and right-handed versions of a chiral molecule (enantiomers) is vital, but also inherently difficult. Traditional optical methods using elliptically or circularly polarized light rely on weak linear effects which arise beyond the electric-dipole approximation, posing major limitations for time resolving ultrafast chiral molecular dynamics. Here we show how, by tilting the plane of polarization of an ultrashort burst of intense elliptically polarized light, towards its propagation direction, we can turn the light field into a highly efficient chiro-optical tool. This "forward tilting" can be achieved by focusing the beam tightly, creating structured light which exhibits a nontrivial polarization pattern in space. We demonstrate that our structured field allows us to realize an interferometer for efficient chiral recognition that separates the nonlinear optical response of left- and right-handed molecules in space. Our work provides a simple, yet highly efficient, way of spatially structuring the polarization of light to image molecular chirality, with extreme enantio-sensitivity and on ultrafast time scales.
