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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 dimensionsdoi:10.18419/opus-4690 fatcat:qfgulkvssfefdobucaaquw6d5y