Entwicklung eines optischen Nahfeld-Spektrometers im Terahertz-Bereich [article]

Stephan Mair, Universität Stuttgart, Universität Stuttgart
Today several modern areas of condensed matter physics like electronically correlated systems call for investigations in the low energy range of the electromagnetic spectrum. Unfortunately the spatial resolution is generally restricted by Abbe's diffraction limit, which in this frequency range is as large as 5 mm to 0.1 mm. On the other hand the growth of large crystals of these exotic materials is rather difficult, thus it is not always possible to grow monocrystalline areas with dimensions
more » ... with dimensions larger than the wavelength. To overcome this problem, we have designed a near-field spectrometer which combines a high spatial resolution of up to 1 µm with a large frequency range from 30 GHz to 1.5 THz. To control the distance between sample and pinhole and to examine the sample area in situ we use an image-processing confocal microscope. Furthermore the whole near field unit is incorporated in an optical cryostat, which allows temperature dependent measurements in the range from 4 K to 400 K.
doi:10.18419/opus-4690 fatcat:qfgulkvssfefdobucaaquw6d5y