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Abstract

The terahertz (THz) radiation covers the frequency range from 0.1 to 30 THz in the electromagnetic spectrum, which is situated between the realms of electronics and optics. During the last decades, the THz frequency region has increasingly drawn the interest of numerous research communities, such as physics, chemistry, material science, and medicine. Combined with technological improvements in the fields of photonics and optics, plentiful applications of the THz radiation in a variety of directions have emerged. That increasing interest is due to the fact that THz photon energies can couple resonantly to many elementary processes in all states of matter. In solids, for example, phonos, spin resonances, excitons, plasma
frequencies, and superconducting gaps exist in this frequency range.
In this work, the produced THz pulsed radiation is intended to be employed for realizing a newly developed ultrafast scanning tunneling microscopy technique called THz-STM. That technique gives access to various spatiotemporal phenomena and enables the study of ultrafast dynamics of optical excited systems, such as nanostructures and molecules at surfaces, with femtosecond temporal and atomic-level spatial resolution.