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.
Dispersions of absorption coefficient μa, complex refractive index n, complex permittivity e and penetration depth δ of CdSe quantum dots were experimentally obtained in terahertz frequency range of 0.1-1 THz. The possibility of optical properties control by quantum dots sizes and temperature treatment was shown.
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.
In this paper the formulas from the dispersion equation for the infinite photonic crystal for exact definition of
frequencies of gap location, gap edges and gap width with multiple optical layers lengths in bilayer cell in the
frequency range from 0.1 to 1 THz were derived. The formulas were verified by numerical simulation of
photonic crystals using the transmission matrix method and finite-difference time-domain method for the first,
second and third multiplicity of optical layers lengths in bilayer cell of the photonic crystal. The formulas for
the second multiplicity case were confirmed experimentally.
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