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31 August 2015 Ultrafast field-resolved multi-THz spectroscopy on the sub-nanoparticle scale
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Terahertz spectroscopy plays a key role in understanding ultrafast carrier dynamics in nanomaterials. Diffraction, however, limits time-resolved terahertz spectroscopy to ensemble measurements. By combining time-resolved terahertz spectroscopy in the multi-terahertz range with scattering-type near-field scanning optical microscopy, we show that we can directly trace ultrafast local carrier dynamics in single nanoparticles with sub-cycle temporal resolution (10 fs). Our microscope provides both 10 nm lateral resolution and tomographic sensitivity, allowing us to observe the ultrafast build-up of a local surface depletion layer in an InAs nanowire.
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Tyler L. Cocker, Max Eisele, Markus A. Huber, Markus Plankl, Leonardo Viti, Daniele Ercolani, Lucia Sorba, Miriam S. Vitiello, and Rupert Huber "Ultrafast field-resolved multi-THz spectroscopy on the sub-nanoparticle scale", Proc. SPIE 9585, Terahertz Emitters, Receivers, and Applications VI, 95850S (31 August 2015);

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