Berlin 2005 – wissenschaftliches Programm

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AKB: Biologische Physik

AKB 200: Poster Session II

AKB 200.39: Poster

Dienstag, 8. März 2005, 17:00–19:00, Poster TU C

Near-field-THz-Imaging with high power cw-radiation — •Bruno Gompf, Michael Gerull, Tobias Müller, and Martin Dressel — 1.Physikalisches Institut, Universität Stuttgart

There is an increasing interest in THz-imaging especially of biological and medical samples. But until now, most of the work done in this field is based on time-domain techniques using ultrafast laser pulses. The inherent disadvantages of this broadband method are the low intensity and poor energy resolution. In combination with a near-field arrangement time-domain techniques have the additional problem that small apertures always act as high pass filters on broad-band radiation. We have developed a near-field spectrometer operating in the THz-range between 30 GHz and 1.4 THz, where we use backward-wave oscillators (BWO) as continuous-wave sources, which supply highly monochromatic (Δν/ν = 10⁻⁶) and coherent radiation with an output power of up to 300 mW. This instrument allows to record THz-images with a high spatial and spectroscopic resolution with an acquisition time of about 10 ms/pixel.