Ultra-thin metallic layers studied by broadband terahertz time-domain spectroscopy

摘要

We report on the optical properties of ultra thin metallic layers in the frequency range of 0.1-5 THz. Such layers show unusual properties compared to the bulk material which are successfully exploited in new application fields such as THz optics. The measured properties of ultra-thin metallic layers made by chromium in the frequency from 0.2 to 5 THz is presented. The decreased amplitude of the reflected THz pulses has been exploited as a metallic anti-reflection coating for electro-optic gallium phosphide sensor which improved the gained signal quality.