Title :
Accessing Terahertz Complex Conductivity Dynamics in the Time-Domain
Author :
Cunningham, P.D.
Author_Institution :
Electron. Sci. & Technol. Div., Naval Res. Lab., Washington, DC, USA
Abstract :
Time-resolved terahertz (THz) spectroscopy is frequently utilized to measure conductivity dynamics on ultrafast time scales. Typically photo-induced changes in the transmission of the peak of the THz waveform are recorded and thought to represent the real conductivity dynamics. Here we evaluate a time-domain scheme that accesses both the real and imaginary conductivity dynamics by recording the photo-induced change in the transmitted THz pulse at its peak and its zero-crossing, respectively. The applicability and limitations of this method are investigated by modeling the THz response of material systems with known conductivity dynamics. The relationship between measured time-domain dynamics and the actual charge carrier dynamics is discussed.
Keywords :
terahertz spectroscopy; terahertz wave spectra; time resolved spectra; time resolved spectroscopy; time-domain analysis; THz response; THz waveform transmission; charge carrier dynamics; material systems; photoinduced changes; terahertz complex conductivity dynamics; time-domain dynamics; time-domain scheme; time-resolved terahertz spectroscopy; transmitted THz pulse; ultrafast time scales; Time-resolved terahertz (THz) spectroscopy (TRTS); excited state dynamics;
Journal_Title :
Terahertz Science and Technology, IEEE Transactions on
DOI :
10.1109/TTHZ.2013.2258193