Terahertz Signal generated from chiral metamaterial due to the second order non-linear process has been observed. Chiral metamaterial used in this research have a periodic square pattern with different depth on a silver film and was fabricated by Focused Ion Beam System. Terahertz emission spectroscopy has been conducted using two amplified 100 fs laser pulses with a central wavelength of 800 nm. The emission will emerge due to an optical rectification process as a result of an intense femtosecond laser pulses radiation on a chiral metamaterial sample. The measurement result clearly shows that the terahertz signal is emitted at 2 THz frequency and sufficiently fit with a square of laser power, which is consistent with an expected optical rectification process.
Determination of the carrier-envelope phase of few-cycle laser pulses with terahertz-emission spectroscopy
