Subcycle control of terahertz waveform polarization using all-optically induced transient metamaterials
Subcycle control of terahertz waveform polarization using all-optically induced transient metamaterials
复制标题
DOI：
10.1038/lsa.2014.36
复制
发表时间：
2014-02-01
影响因子：
19.4
通讯作者：
Kampfrath, Tobias
中科院分区：
文献类型：
--
作者：
Kamaraju, N.;Rubano, Andrea;Kampfrath, Tobias
频率范围从0.3到30 THz的相干辐射最近已经可以使用飞秒激光技术。这些太赫兹（THz）波已经应用于光谱学和成像，并且可以使用静态光学元件（如透镜，偏振器和滤波器）进行操纵。然而，THz辐射的超快调制也是必需的，例如，在短距离无线通信中或用于制备成形的THz瞬变以用于许多材料激发的相干控制。在这里，我们展示了一种全光学创建的瞬态超材料，使我们能够操纵太赫兹波形的偏振与子周期开关时间。偏振调制脉冲在控制晶格振动、分子旋转和自旋进动等基本运动方面具有潜在的应用价值。
Coherent radiation with frequencies ranging from 0.3 to 30 THz has recently become accessible using femtosecond laser technology. These terahertz (THz) waves have already been applied in spectroscopy and imaging and can be manipulated using static optical elements such as lenses, polarizers and filters. However, ultrafast modulation of THz radiation is required as well, for instance, in short-range wireless communication or for preparing shaped THz transients for the coherent control of numerous material excitations. Here, we demonstrate an all-optically created transient metamaterial that allows us to manipulate the polarization of THz waveforms with subcycle switch-on times. The polarization-modulated pulses are potentially interesting for controlling elementary motions such as the vibration of crystal lattices, the rotation of molecules and the precession of spins.