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Surface plasmon waves can provide a solution for sub-wavelength resolution imaging and for local spectroscopy at Terahertz (THz) frequencies. Although the surface waves are non-radiative in nature, they can be excited by free-space propagating beams on metallic discontinuities and by tightly focused beams. Using the sub-wavelength aperture near-field microscopy we investigate excitation and guiding of THz surface plasmon waves for applications in THz microscopy and local spectroscopy.

plasmonics; near-field; microscopy; terahertz