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Ultrafast single-nanowire multi-terahertz spectroscopy with sub-cycle temporal resolution
- Source :
- Nature Photonics 8, 841 - 845 (2014)
- Publication Year :
- 2016
-
Abstract
- Phase-locked ultrashort pulses in the rich terahertz (THz) spectral range have provided key insights into phenomena as diverse as quantum confinement, first-order phase transitions, high-temperature superconductivity, and carrier transport in nanomaterials. Ultrabroadband electro-optic sampling of few-cycle field transients can even reveal novel dynamics that occur faster than a single oscillation cycle of light. However, conventional THz 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 THz spectroscopy (20 - 50 THz) to the sub-nanoparticle scale (10 nm) by combining sub-cycle, field-resolved detection (10 fs) with scattering-type near-field scanning optical microscopy (s-NSOM). 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.
- Subjects :
- Condensed Matter - Mesoscale and Nanoscale Physics
Physics - Optics
Subjects
Details
- Database :
- arXiv
- Journal :
- Nature Photonics 8, 841 - 845 (2014)
- Publication Type :
- Report
- Accession number :
- edsarx.1604.04304
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1038/nphoton.2014.225