University of Birmingham > Talks@bham > Metamaterials and Nanophotonics Group Seminars > Terahertz lights up the nanoscale: from far-field spectroscopy to near-field microscopy

Terahertz lights up the nanoscale: from far-field spectroscopy to near-field microscopy

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If you have a question about this talk, please contact Dr Miguel Navarro-Cia.

Terahertz (THz) spectroscopy has emerged as a powerful, non-destructive tool for investigating optoelectronic processes in low-dimensional materials. Its frequency range (0.1–10THz, 0.4–40meV), encompasses the binding energies of typical quasiparticles, including free electrons and holes, plasmons, and magnons. The alternating field of THz radiation can therefore stimulate the motion of these quasiparticles and also promote collective excitations, such as optical phonons, within a material. As typical charge carrier scattering rates for inorganic semiconductors are on the order of 1013 s-1, THz spectroscopy is also sensitive to the electrical conductivity of a material, enabling extraction of key electronic properties (e.g. mobility) in a non-contact fashion. Recently, THz spectroscopy has also been extended to the near-field regime to enable optoelectronic characterisation of individual nanostructures on nanoscale length scales with surface sensitivity. This will talk will discuss THz capability at Manchester, demonstrating how both THz spectroscopy and near-field THz microscopy can be utilised to map the ultrafast carrier dynamics of semiconductor nanomaterials.

This talk is part of the Metamaterials and Nanophotonics Group Seminars series.

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