Title :
Terahertz light bullet-induced nonlinearity in a gold thin film
Author :
Mostafa Shalaby;Carlo Vicario;Christoph P. Hauri
Author_Institution :
Paul Scherrer Institute, SwissFEL, 5232 Villigen PSI, Switzerland
Abstract :
The concept of metamaterials is of growing importance for manipulating THz pulse characteristics. In nonlinear science, metamaterials have been successfully used to locally enhance the THz field intensity [1], thus overcoming the technological challenge in intense generation. In such structures, local field intensities up to 2.6 GV/m have been demonstrated [2]. These structures are made mainly from gold. However, so far the linear response of gold has been taken for granted in the design and measurements interpretation of such structures. Here, using an intense THz bullet (3.3 GV/m) [3], we show that the dielectric constant of gold is changed under high THz field. We performed our experiment on a thin gold sheet in a THz pump-optical Kerr rotation probe in reflection.
Keywords :
"Gold","Metamaterials","Probes","Dielectric measurement","Dielectric constant","Reflection","Nonlinear optics"
Conference_Titel :
Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2015 40th International Conference on
Electronic_ISBN :
2162-2035
DOI :
10.1109/IRMMW-THz.2015.7327468