Journal
ACS PHOTONICS
Volume 7, Issue 11, Pages 3207-3215Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.0c01282
Keywords
strong-field nanophysics; avalanche ionization
Categories
Funding
- Max Planck Society
- China Scholarship Council
- German Research Foundation (DFG) [SPP1840, SFB652]
- DFG [398382624, ZH582/1-1, TI210-7/1, TI210-8/1]
- Swedish Research Council [2016-05409, 2019-02376]
- Atomic, Molecular and Optical Sciences Program, Office of Basic Energy Sciences [DE-FG02-01ER15213]
- U.S. Department of Energy [DE-FG02-86ER13491]
- BMBF [05K16KEA]
- Bundesministerium fur Bildung und Forschung (BMBF) [05K16HRB]
- Swedish Research Council [2019-02376, 2016-05409] Funding Source: Swedish Research Council
- U.S. Department of Energy (DOE) [DE-FG02-01ER15213] Funding Source: U.S. Department of Energy (DOE)
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Strong-field laser-matter interactions in nanoscale targets offer unique avenues for the generation and detailed characterization of matter under extreme conditions. Field-driven, subcycle ionization-induced metallization of nanoscale solids in intense laser fields has been predicted (Peltz et al. Time-Resolved X-ray Imaging of Anisotropic Nanoplasma Expansion. Phys. Rev. Lett. 2014, 113, 133401), but its observation was hampered by a lack of a smoking gun. Here, we report the ultrafast metallization of isolated dielectric and semiconducting nanoparticles under intense few-cycle laser pulses. The highest-energy electron emission is found to be a decisive proof that shows a characteristic cutoff modification to a metallic limit for intensities high enough to ignite carrier avalanching in the volume of the particles. Semiclassical Mean-field Mie Monte-Carlo transport simulations reveal the underlying dynamics and explain the observed evolution by near-field driven electron backscattering from the metallizing target.
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