Journal
NATURE PHOTONICS
Volume 8, Issue 11, Pages 841-845Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2014.225
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Funding
- European Research Council through ERC [305003]
- Deutsche Forschungsgemeinschaft through Graduate Research College [GRK 1570]
- Italian Ministry of Education, University, and Research (MIUR) through the Futuro in Ricerca [RBFR10LULP]
- Alexander von Humboldt Foundation
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Phase-locked ultrashort pulses in the rich terahertz spectral range(1-18) have provided key insights into phenomena as diverse as quantum confinement(7), first-order phase transitions(8,12), high-temperature superconductivity(11) and carrier transport in nanomaterials(1,6),(13-15). Ultrabroadband electrooptic sampling of few-cycle field transients(1) can even reveal novel dynamics that occur faster than a single oscillation cycle of light(4,8,10). However, conventional terahertz spectroscopy is intrinsically restricted to ensemble measurements by the diffraction limit. As a result, it measures dielectric functions averaged over the size, structure, orientation and density of nanoparticles, nanocrystals or nanodomains. Here, we extend ultrabroadband time-resolved terahertz spectroscopy to the sub-nanoparticle scale (10 nm) by combining subcycle, field-resolved detection (10 fs) with scattering-type near-field scanning optical microscopy (s-NSOM)(16-26). We trace the time-dependent dielectric function at the surface of a single photoexcited InAs nanowire in all three spatial dimensions and reveal the ultrafast (<50 fs) formation of a local carrier depletion layer.
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