Pump and probe experimental setup with optoelectronically pulsed antenna for giga/terahertz spectroscopy

A detailed description of a picosecond pump-probe optoelectronic pulsing (g enerating electromagnetic transients in free space.) and sampling system is presented. This system will be used for spectroscopy in a [10-100]-GHz ran ge of materials such as semiconductors. The signal-to-noise ratio obtained in this system is greater than 40 dB and the time resolution can be less th an 500 fs, thereby permitting studies of very fast, low-amplitude transient phenomena. For microdevices separated by 5 cm an E peak field amplitude of 80 V/m is detected.