Highlights

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Picosecond charge transport in rutile at high carrier densities studied by transient terahertz spectroscopy

In rutile the charge carriers form polarons with high effective mass owing to the strong electron-phonon coupling. In this paper we studied ultrafast terahertz photoconductivity in rutile under strong optical excitation.

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Ultrafast photoconductivity in semiconductor nanostructures

Time-resolved terahertz spectroscopy provides a useful insight into charge carrier motion in nanostructured semiconductors: it provides a contact-free access to local response of charge carriers inside nanostructures averaged over macroscopic volume of a sample. This is a very pertinent quantity for many applications of disordered materials which still have a larger potential than perfectly aligned nanostructures.

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Nonmagnetic microspheres with resonant magnetic response

Metamaterials are artificial resonant composite structures formed by common materials; however, the sizes of the resonators and the distances among them are much smaller than the targeted wavelength of the radiation. A proper choice of materials and of their arrangement can induce an unusual electromagnetic behavior. In this way, it is possible to conceive e.g. a medium with a negative refractive index (i.e. with simultaneously negative dielectric permittivity and magnetic permeability) allowing one to overcome the diffraction limit in the optical imaging.

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