Ultrafast multi-terahertz nano-spectroscopy with sub-cycle temporal resolution

By M. Eisele, T. Cocker, M. Huber, M. Plankl, L. Viti, D. Ercolani, L. Sorba, Miriam S. Vitiello, R. Huber. Nature Photonics, 2014

302 citations recorded by the source corpus.

The authors demonstrate ultrabroadband time-resolved THz spectroscopy on a single InAs nanowire with 10 nm spatial resolution and sub-100 fs time resolution. Phase-locked ultrashort pulses in the rich terahertz spectral range1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18 have provided key insights into phenomena as diverse as quantum confinement7, first-order phase transitions8,12, high-temperature superconductivity11 and carrier transport in nanomaterials1,6,13,14,15. Ultrabroadband electro-optic sampling of few-cycle field transients1 can even reveal novel dynamics that occur faster than a single oscillation cycle of light4,8,10. 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 sub-cycle, field-resolved detection (10 fs) with scattering-type near-field scanning optical microscopy (s-NSOM)16,17,18,19,20,21,22,23,24,25,26. 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.

Subfields: Biomedical Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/bfe077b86839d18a08899144eb94f5c870d73247

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Citations in the corpus

A review of the electrical properties of semiconductor nanowires: insights gained from terahertz conductivity spectroscopy (2016, methodology): “These advances may be achieved by extending the promising s-NSOM tools developed by Eisele et al [75] to the conventional THz range (0.”
The 2023 terahertz science and technology roadmap (2023, background): “There is already strong interest in combining THz sources with scattering-type scanning nearfield optical microscopy (THz-SNOM) [120] since this technique allows for deep sub-wavelength resolution (<20 nm), thousands of times below the diffraction limit.”
Colloquium: Nonthermal pathways to ultrafast control in quantum materials (2021, methodology): “…(tr-SNOM) tracks photoinduced changes in the optical constants of materials on the 10 nm length scale with high temporal and spectral resolution (Eisele et al., 2014; Wagner et al., 2014). tr-SNOM has been used to investigate photoinduced insulator-to-metal transitions (Dönges et al., 2016;…”