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@ARTICLE{Shchur:616201,
      author       = {Shchur, Yaroslav and Karout, Houda El and Sahraoui, Bouchta
                      and Andrushchak, Anatoliy and Beltramo, Guillermo and
                      Pustovyi, Denys and Vitusevich, Svetlana and Huber, Patrick
                      and Kityk, Andriy V.},
      title        = {{S}ynthesis, nanocrystalline morphology, lattice dynamics
                      and nonlinear optics of mesoporous},
      journal      = {Scientific reports},
      volume       = {14},
      number       = {1},
      issn         = {2045-2322},
      address      = {[London]},
      publisher    = {Macmillan Publishers Limited, part of Springer Nature},
      reportid     = {PUBDB-2024-06361},
      pages        = {24237},
      year         = {2024},
      abstract     = {We demonstrate a hybrid nanocomposite combining mesoporous
                      silica, pSiO$_2$, as a host medium and guest lithium niobate
                      LiNbO$_3$ nanocrystals embedded into tubular silica
                      nanochannels by calcination of the precursor mixed solution
                      of lithium and niobium salts. High-resolution transmission
                      electron microscopy, X-ray diffraction and Raman scattering
                      techniques reveal trigonal LiNbO3 nanocrystals within the
                      pSiO$_2$ nanochannels, indicating their random texture
                      morphology. Annealing at high temperatures ( 950◦C) during
                      calcination also leads to partial crystallization of the
                      pSiO$_2$ matrix with the formation of trigonal α-SiO$_2$
                      nanocrystals. The Raman microscopy analysis of the
                      pSiO$_2$:LiNbO$_3$ nanocomposite reveals three structural
                      crystalline phases, α − SiO$_2$, LiNbO$_3$ and a mixed
                      phase which involves the α-SiO$_2$ phase of host membrane
                      and LiNbO$_3$ nanocrystals embedded into the membrane. The
                      finite size of the LiNbO$_3$ nanocrystals results in
                      specific features of the LO-TO phonon frequency splitting,
                      which are investigated by Raman microscopy. In the
                      transmission geometry, the second harmonic generation
                      emission exhibits no Maker fringes and is characterized by a
                      broad angular diagram of diffusely scattered light. The
                      second harmonic generation response is independent of the
                      polarization direction of the incident pump light, thus
                      indicating a spatial isotropy of the nonlinear optical
                      conversion in the pSiO$_2$:LiNbO$_3$ composite, consistent
                      with the randomly oriented textural morphology of the
                      deposited LiNbO$_3$ nanocrystals. The contribution of the
                      guest LiNbO$_3$ nanocrystals to the second harmonic
                      generation effect was found to be strongly dominant compared
                      to the partially crystallized host pSiO$_2$ matrix. The
                      nanocomposite pSiO$_2$:LiNbO$_3$ membrane, set in the 90◦
                      nonlinearoptical geometry, shows unusually high diffusely
                      transmitted second harmonic generation light (back-reflected
                      emission), apparently supported by internal light reflection
                      from the tubular nanochannel network. Despite the
                      fundamental interest, the revealed anomalous back-reflected
                      second harmonic generation emission from pSiO$_2$:LiNbO$_3$
                      nanocomposite membranes expands the prospects for their
                      photonic and nonlinear optical applications.},
      cin          = {CIMMS / FS-PS},
      ddc          = {600},
      cid          = {I:(DE-H253)CIMMS-20211022 / I:(DE-H253)FS-PS-20131107},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / SFB 986 B07 - Polymere in
                      grenzflächenbestimmten Geometrien: Struktur, Dynamik und
                      Funktion an planaren und in porösen Hybridsystemen (B07)
                      (318019437)},
      pid          = {G:(DE-HGF)POF4-631 / G:(GEPRIS)318019437},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {39414882},
      UT           = {WOS:001336670300020},
      doi          = {10.1038/s41598-024-75686-6},
      url          = {https://bib-pubdb1.desy.de/record/616201},
}