光導兆赫輻射發射元件之最佳操作條件研究

Abstract

在進行THz-TDS實驗時，我們需要一強度更強更穩定的兆赫輻射波源。我們對不同材料和造型之光導兆赫輻射發射元件，比較在不同操作條件下兆赫輻射電場的大小，以便尋找最佳的操作條件。在目前之最佳條件操作下，兆赫波訊號強度及訊雜比均獲得顯著改善，兆赫輻射電場振幅增加七倍以上，且訊雜比由10^3提升至10^5。

A high-power and stable terahertz radiation source is required to study the terahertz time-domain spectroscopy in various thin films.The conditions of optimal operations have investigated by comparing the magnitude of treahertz electric fields,which are generated by semiconducting photoconductive terahertz emitters with different materials and patterns.The intensity of terahertz radiation and signal-to-noise ratio have been significantly improved under the optimal conditions.The amplitude of terahertz electric field increased above seven times and signal-to-noise ratio raised from 103 to 105 .