A 570-630 GHz FREQUENCY DOMAIN TERAHERTZ SPECTROSCOPY SYSTEM BASED ON A BROADBAND QUASI-OPTICAL ZERO BIAS SCHOTTKY DIODE DETECTOR

摘要

We report a room temperature 570-630 GHz frequency domain terahertz (THz) spectroscopy systemndeveloped on the basis of a broadband quasi-optical zero bias Schottky diode detector. The detectornis designed to cover the frequency range of 100 GHz to nearly 900 GHz. A responsivity of 300-1000nV/W has been measured, and the noise equivalent power (NEP) is estimated to be 5-20 pW/√Hznbased on the measurements of similar detectors. For a prototype demonstration, the frequencyndomain THz spectroscopy system was operated within the region of 570-630 GHz using a VDIn(Virginia Diodes, Inc.) frequency extension module (FEM) to provide the THz radiation. Mylar thinnfilms with different thicknesses and THz metal mesh filters have been measured using this system,ndemonstrating a measurement accuracy of ~2%. This system has been applied to measurenbiomolecules in liquid-phase, and nano-material samples in solid-phase. Initial results andndiscussion are presented.