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Title: Soft X-Ray Second Harmonic Generation as an Interfacial Probe

Journal Article · · Physical Review Letters
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  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Elettra-Sincrotrone Trieste S.C.p.A., Trieste (Italy)
  5. National Research Council of Italy, Padova (Italy); Univ. of Padova, Padova (Italy)
  6. Elettra-Sincrotrone Trieste S.C.p.A., Trieste (Italy); Univ. of Nova Gorica, Nova Gorica (Slovenia)
  7. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  8. Center for High Pressure Science & Technology Advanced Research, Shanghai (China)
  9. Elettra-Sincrotrone Trieste S.C.p.A., Trieste (Italy); Elettra Lab., Trieste (Italy)
  10. National Research Council of Italy, Padova (Italy)
  11. Elettra-Sincrotrone Trieste S.C.p.A., Trieste (Italy); C.R. Frascati, Frascati (Rome) (Italy)
  12. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)

Nonlinear optical processes at soft x-ray wavelengths have remained largely unexplored due to the lack of available light sources with the requisite intensity and coherence. Here we report the observation of soft x-ray second harmonic generation near the carbon K edge (~284 eV) in graphite thin films generated by high intensity, coherent soft x-ray pulses at the FERMI free electron laser. Our experimental results and accompanying first-principles theoretical analysis highlight the effect of resonant enhancement above the carbon K edge and show the technique to be interfacially sensitive in a centrosymmetric sample with second harmonic intensity arising primarily from the first atomic layer at the open surface. Here, this technique and the associated theoretical framework demonstrate the ability to selectively probe interfaces, including those that are buried, with elemental specificity, providing a new tool for a range of scientific problems.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515; AC36-08GO28308; SC0004993; W911NF-13-1-0483; W911NF-17-1-0163; DGE 1106400
OSTI ID:
1418311
Alternate ID(s):
OSTI ID: 1416070; OSTI ID: 1417659
Journal Information:
Physical Review Letters, Vol. 120, Issue 2; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 54 works
Citation information provided by
Web of Science

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Cited By (10)

Coherent soft X-ray pulses from an echo-enabled harmonic generation free-electron laser journal May 2019
The ultrafast X-ray spectroscopic revolution in chemical dynamics journal May 2018
Nonlinear XUV-optical transient grating spectroscopy at the Si L 2,3 –edge journal May 2019
Exploring the multiparameter nature of EUV-visible wave mixing at the FERMI FEL journal July 2019
Complete Characterization of Phase and Amplitude of Bichromatic Extreme Ultraviolet Light journal November 2019
Nanoscale transient gratings excited and probed by extreme ultraviolet femtosecond pulses journal July 2019
Optical constants modelling in silicon nitride membrane transiently excited by EUV radiation journal January 2018
Dynamic interference as signature of atomic stabilization journal January 2018
Full-field microscope with twin Wolter mirrors for soft X-ray free-electron lasers journal January 2019
Coherent Soft X-Ray pulses from an Echo-Enabled Harmonic Generation Free-Electron Laser text January 2019

Figures / Tables (3)


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