Linking high harmonics from gases and solids

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Journal titleNature
Pages462464; # of pages: 3
Subjectzinc oxide; electron; electronic equipment; gas phase reaction; harmonic analysis; ion exchange; ionization; laser method; measurement method; oxide; solid; spectrum; tomography; X-ray; zinc; Article; electron; gas; ionization; priority journal; solid
AbstractWhen intense light interacts with an atomic gas, recollision between an ionizing electron and its parent ion creates high-order harmonics of the fundamental laser frequency. This sub-cycle effect generates coherent soft X-rays and attosecond pulses, and provides a means to image molecular orbitals. Recently, high harmonics have been generated from bulk crystals, but what mechanism dominates the emission remains uncertain. To resolve this issue, we adapt measurement methods from gas-phase research to solid zinc oxide driven by mid-infrared laser fields of 0.25 volts per ångström. We find that when we alter the generation process with a second-harmonic beam, the modified harmonic spectrum bears the signature of a generalized recollision between an electron and its associated hole. In addition, we find that solid-state high harmonics are perturbed by fields so weak that they are present in conventional electronic circuits, thus opening a route to integrate electronics with attosecond and high-harmonic technology. Future experiments will permit the band structure of a solid to be tomographically reconstructed. © 2015 Macmillan Publishers Limited. All rights reserved.
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AffiliationNational Research Council Canada
Peer reviewedYes
NPARC number21276214
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Record identifier2963738f-c015-4d4b-a754-70f06d058fac
Record created2015-09-28
Record modified2016-05-09
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