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Spectroscopic THz near-field microscope
H-G von Ribbeck1, M Brehm, D W van der Weide
1Max-Planck-Institut für Biochemie and Center for Nanoscience, 82152 Martinsried (München), Germany. ribbeck@biochem.mpg.de
Abstract:
We demonstrate a scattering-type scanning near-field optical microscope (s-SNOM) with broadband THz illumination. A cantilevered W tip is used in tapping AFM mode. The direct scattering spectrum is obtained and optimized by asynchronous optical sampling (ASOPS), while near-field scattering is observed by using a space-domain delay stage and harmonic demodulation of the detector signal. True near-field interaction is determined from the approach behavior of the tip to Au samples. Scattering spectra of differently doped Si are presented.

