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The terahertz (THz) electromagnetic wave frequency range - broadly defined as 0.1 – 30 THz (3 mm – 10 µm wavelength) - is at the interface of modern electronics and optics. This electromagnetic spectrum has been much less explored and has been called the “terahertz gap” due to the lack of efficient, room-temperature sources and detectors. Despite these difficulties, there has been recent explosion of interest in using THz pulse to address many questions in electrical engineering, physics, chemistry, and material sciences.