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It is investigated the frequency multiplication of terahertz electromagnetic radiation in dielectric waveguides on the base of the crystalline paraelectric SrTiO3 at the temperatures 77 K when a bias electric field is applied. The frequency dispersion and the transverse width of the waves affect the generation of higher harmonics. It is possible to select the certain numbers of higher harmonics due...
Tunable, nonlinear, and active metamaterials can be created on the base of layered media, when alternating thin layers possess permittivities of different signs. Nonlinear concentrators based on these hyperbolic metamaterials are investigated. The new method for modeling nonlinear field and energy concentrators is reported, which includes the combination of a new version of complex geometrical optics...
The nonlinear interaction of transversely bounded terahertz pulses with layered structures that include graphene layers is investigated theoretically. The nonlinearity possesses the focusing character both in longitudinal and transverse directions. There exist the optimum input amplitudes and transverse widths of the input pulse to get the maximum pulse compression.
Modulators of terahertz (THz) range on the base of silicon integrated p-i-n-structures in the isolated silicon dielectric waveguide are investigated. For the double injection problem, the generalized boundary conditions at the injecting electrodes have been used in the case of highly doped p++, n++ regions. The silicon dielectric waveguides possess low losses in the regime without injection. The investigations...
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