Gacemi D, Mangeney J, Laurtent T, Lampin J-F, Akalin T, Blary K, Degiron A, Crozat P, Meng F
Institut d’Electronique Fondamentale, UMR8622 CNRS, Univ. Paris Sud, 91405 Orsay, France.
Opt Express. 2012 Apr 9;20(8):8466-71. doi: 10.1364/OE.20.008466.
The dispersion relation and confinement of terahertz surface plasmon modes propagating along planar Goubau lines are studied using guided-wave time domain spectroscopy. We demonstrate the radial nature of the surface plasmon mode known as the Goubau mode and the transverse confinement of the electric field over a few tenths of microns (~l/10). We experimentally and computationally observed a transition of the shape of the THz pulses from unipolar to bipolar as the propagation distance increases, indicating that the Goubau line acts as a high-pass filter. The deviation of the dispersion relation curve from a linear law above 600 GHz is discussed.
利用导波时域光谱技术研究了沿平面古鲍线传播的太赫兹表面等离子体激元模式的色散关系和限制特性。我们证明了被称为古鲍模式的表面等离子体激元模式的径向特性以及电场在几十微米（约为波长的1/10）范围内的横向限制。我们通过实验和计算观察到，随着传播距离的增加，太赫兹脉冲的形状从单极转变为双极，这表明古鲍线起到了高通滤波器的作用。文中还讨论了在600GHz以上色散关系曲线与线性规律的偏差。
