In this paper magnetic system with a localized high-intensity magnetic field due to giant magnetic anisotropy magnets was proposed for THz time-domain spectroscopy. The magnetic system consists of two hemispheres which are made from two types of magnets. The both hemispheres will be used for an improvement of THz generation and one hemisphere will be used for investigation of spectral and optical properties of an object at strong magnetic field. The proposed magnetic system was numerically calculated in COMSOL MultiPhysics using AC/DC Module. These results may be used for development of real magnetic THz time-domain spectroscopy system.
Photonic crystals are one of the most remarkable metamaterials for electromagnetic waves manipulation for last decades, therefore they can be used as filters, waveguides, polarization changers, superlenses, superprisms, etc. As well today graphene has attracted considerable attention due to the unusual properties. In this paper the excitation of surface waves in the photonic crystal bounded by graphene layer was investigated for terahertz frequency range from 0.1 to 1 THz. Peaks of transmissivity in band-gaps of photonic crystal that caused by excitation of surface waves were obtained. The control of frequency position of peaks by temperature and magnetic field was demonstrated.