http://www.cnr.it/ontology/cnr/individuo/prodotto/ID310221

Ultrafast multi-terahertz nano-spectroscopy with sub-cycle temporal resolution (Articolo in rivista)

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Ultrafast multi-terahertz nano-spectroscopy with sub-cycle temporal resolution (Articolo in rivista) (literal)

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Eisele M.[ 1 ] ; Cocker T.L.[ 1 ] ; Huber M.A.[ 1 ] ; Plankl M.[ 1 ]; Viti L.[ 2,3 ]; Ercolani D.[ 2,3 ]; Sorba L.[ 2,3 ]; Vitiello M.S.[ 2,3 ]; Huber R.[ 1 ] (2014)
Ultrafast multi-terahertz nano-spectroscopy with sub-cycle temporal resolution
in Nature photonics (Print)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Eisele M.[ 1 ] ; Cocker T.L.[ 1 ] ; Huber M.A.[ 1 ] ; Plankl M.[ 1 ]; Viti L.[ 2,3 ]; Ercolani D.[ 2,3 ]; Sorba L.[ 2,3 ]; Vitiello M.S.[ 2,3 ]; Huber R.[ 1 ] (literal)

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[ 1 ] Univ Regensburg, Dept Phys, D-93040 Regensburg, Germany [ 2 ] CNR, NEST, Ist Nanosci, I-56127 Pisa, Italy [ 3 ] Scuola Normale Super Pisa, I-56127 Pisa, Italy (literal)

Titolo

Ultrafast multi-terahertz nano-spectroscopy with sub-cycle temporal resolution (literal)

Abstract

Phase-locked ultrashort pulses in the rich terahertz 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 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 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. (literal)

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