论文标题
无宽带分散THZ波导平台
Wideband dispersion-free THz waveguide platform
论文作者
论文摘要
我们提出了一个集成的THZ光谱和传感平台，其具有低损耗，真空样色散和强烈的场限制。它的性能是在0.1 THz和1.5 THz之间的实验表征的。虽然线性THZ光谱和传感主要从低损耗和扩展的相互作用长度获得，但非线性THZ光谱也将从与强模式约束相关的场上增强中获利。此外，真空色散可以使宽带单一至几个周期脉冲在气相样品中无用，或者在THZ泵之间匹配和可见到红外探针脉冲之间的速度匹配。我们的平台基于金属结构，并属于双岭波导类别。我们表征了必需的波导特性，例如，传播和弯曲损失，但也证明了连接和干涉仪，从本质上讲，这些元素是整合THZ波形合成的先决条件，因此对于相干控制的线性和非线性相互作用。
We present an integrated THz spectroscopy and sensing platform featuring low loss, vacuum-like dispersion, and strong field confinement in the fundamental mode. Its performance was characterized experimentally for frequencies between 0.1 THz and 1.5 THz. While linear THz spectroscopy and sensing gain mostly from low loss and an extended interaction length, nonlinear THz spectroscopy would also profit from the field enhancement associated to strong mode confinement. Moreover, the vacuum-like dispersion allows for a reshaping-free propagation of broadband single- to few-cycle pulses in gas-phase samples or velocity matching between THz pump and visible to infrared probe pulses. Our platform is based on a metallic structure and falls in the category of double ridged waveguides. We characterize essential waveguide properties, for instance, propagation and bending losses, but also demonstrate junctions and interferometers, essentially because those elements are prerequisites for integrated THz waveform synthesis, and hence, for coherently controlled linear and nonlinear interactions.
