NEW APPLICATIONS OF THz TIME-DOMAIN SPECTROSCOPY By

This thesis was conducted to provide new applications to THz time-domain spectroscopy and to test alternative theories of conduction by precisely measuring the complex conductivity of doped silicon from low frequencies to frequencies higher than the plasma frequency and the carrier damping rate. I hope this thesis should be of interest to a wide audience of researchers who use thin film and doped silicon as an optical material at THz frequencies. I would like to sincerely thank Dr. Daniel Grischkowsky, my principal advisor, for his intelligent supervision, constructive guidance, scholarship, and encouragement