Time-Resolved Terahertz (THz) Spectroscopy
The goal of the project is to develop a method to perform time-resolved terahertz (THz) spectroscopy on materials in both optically excited and ground states using low amounts of laser power. We use a low-temperature grown GaAs semiconductor antenna that is illuminated by ultrashort laser pulses from a Ti:sapphire oscillator to produce THz pulses. Optically excited samples are pumped with the laser light and then probed with the THz pulse. The signal is detected using an electro-optic double lock-in method in order to separate small signals from the noise. This system will be useful in the study of crystalline structure and charge carrier mobility, particularly in materials used in photovoltaic cells. After completing the system, preliminary measurements were taken using copper sul de (CuS) nanoparticles. We found that using a single lock-in detection system, we are able to observe changes in the THz pulse that can be used to characterize the CuS nanoparticles.
Franklin and Marshall College Archives, Undergraduate Honors Thesis 2012
- F&M Theses Collection