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Opt Express. 2008 Mar 3;16(5):3430-8.

Spectroscopic THz near-field microscope.

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  • 1Max-Planck-Institut für Biochemie and Center for Nanoscience, 82152 Martinsried (München), Germany.


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.

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