THz Spectrum Analyzer

ABSTRACT: We propose to demonstrate a THz spectrum analyzer using a innovative, high speed involute delay stage in a Michelson interferometer configuration coupled to a Glow Discharge Detector (GDD). Compared to traditional linear stages, the involute stage offers a superior linear response, 1,000 times faster than traditional linear stages, and a more compact footprint. The involute interferogram measured by the GDD is converted via fourier transform to the spectral distrubution of the externally supplied unknown THz source. The spectral sensitivity of the system is determined by the GDD, which has the potential to be a broadband (>10 THz), fast (~MHz), and sensitive (Noise Equivalent Power NEP-<10^-10 W/Hz1/2). The GDD THz detector works at room temperature, and is also compact and inexpensive to fabricate. Zomega Terahertz Corp., in cooperation with the Center for Terahertz Research at RPI, has experience in the development and commercialization of compact THz devices. Zomega will integrate the GDD and the circular involute with the necessary control and display electronics in order to provide a compact, robust, user-friendly spectrum analyzer. BENEFIT: The resulting THz spectrum analyzer will be a useful diagnostic tool for new THz sources and as a calibration tool for existing sources. We anticipate as commercial applications become available for THz systems, this will be an essential tool for the calibration, lifecycle measurement and maintenance of THz sources and systems.