Special Issue "Lithium Niobate: Bulk Crystals, Composites, Thin Films and Nanocrystals"

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystal Engineering".

Deadline for manuscript submissions: 31 December 2017

Special Issue Editors

Guest Editor
Prof. Dr. Mirco Imlau

School of Physics, Universitat Osnabruck, Osnabruck, Germany
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Guest Editor
Prof. Dr. László Kovács

Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1121 Budapest, Konkoly-Thege M. út 29-33, Hungary
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Special Issue Information

Dear Colleagues,

The era of nanoscience has broadened our scientific cognition of lithium niobate (LN) crystals, revealing fascinating routes for their preparation as thin films, ultrathin membranes, nanoparticles,
nano-patterned surfaces, hybrid systems in combination with silica, polymers or liquid crystals, and many more. Moreover, technologies for precise structuring of the surface or the bulk on the sub-micron length scale using photons, electrons and ions have been successfully applied to LN. This progress is accompanied with an extension of our knowledge on LN from a nano-scientific viewpoint, i.e., on a microscopic level. It also opened the range of applications of LN in the direction of biophysics and medicine (cell-imaging and cancer therapy), photovoltaics of nano-ferroelectrics, integrated quantum photonics, nanophotonics, etc. This progress developed on the top of the already existing impact of bulk LN crystals, e.g., in the fields of nonlinear photonics (THz generation, frequency conversion), integrated optics (waveguiding, division wavelength multiplexing) or GHz-wave technologies (surface-acoustic wave detection, electro-optical modulators), etc.

This Special Issue intends to bring together the LN community around the latest experimental, theoretical and computational research highlights and may represent a state-of-the-art meeting point for researchers from diverse disciplines (physics, chemistry, nanotechnology, biophysics, material scientists, etc.) with the goal to disseminate the state-of-the-art knowledge on LN to a worldwide community and to foster the research progress on LN in nanosciences. We therefore would like to open this Special Issue to all related fields:

  • Nanosciences and -technologies
  • (Nonlinear) nanophotonics
  • Integrated optics
  • Quantum photonics
  • (Nano-)Biophotonics
  • Photovoltaics of nanoferroelectrics
  • Accelerator physics

Covering LN as:

  • Ultrathin LN-films
  • LN membranes
  • LN hybrid materials (LN/liquid crystals, LN/polymers, etc.)
  • LN on insulators
  • LN surfaces
  • 2D and 3D structured LN
  • LN nanocrystals and nanopowders

In addition to novel research results on bulk LN and its well-established applications.

Prof. Dr. Mirco Imlau
Prof. Dr. László Kovács
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Lithium niobate;
  • Nano-scaled Oxides,
  • Niobate Nanoparticles and -crystals,
    ferroelectric photovoltaics
  • Lithium niobate nanophotonics.

Published Papers (2 papers)

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Research

Open AccessArticle Improvement in the Photorefractive Response Speed and Mechanism of Pure Congruent Lithium Niobate Crystals by Increasing the Polarization Current
Crystals 2017, 7(12), 368; doi:10.3390/cryst7120368
Received: 24 September 2017 / Revised: 4 November 2017 / Accepted: 7 December 2017 / Published: 11 December 2017
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Abstract
A series of pure congruent lithium niobate (LiNbO3, CLN) crystals were grown and directly polarized under different electric currents in the growth furnace. Their holographic properties were investigated from the ultraviolet to the visible range. The response time shortened, whereas the
[...] Read more.
A series of pure congruent lithium niobate (LiNbO3, CLN) crystals were grown and directly polarized under different electric currents in the growth furnace. Their holographic properties were investigated from the ultraviolet to the visible range. The response time shortened, whereas the diffraction efficiency increased incrementally with the electric current. In particular, the response time of CLN polarized under 100 mA can be reduced by a factor of 10 with a still high saturation diffraction efficiency of about 40.8% at 351 nm. Moreover, its response speed improved by 60 times and 10 times for 473 and 532 nm laser, respectively. The light erasing behavior implies that at least two kinds of photorefractive centers exist in the crystals. Increasing the polarization current induces two pronounced UV absorption peaks and a wide visible absorption peak in CLN crystals. The diffusion effect dominates the photorefractive process and electrons are the dominant carriers. The possible mechanism for the fast photorefractive response is discussed. Increasing the polarization electric current is an effective method to improve the photorefractive response of LN crystal. Full article
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Open AccessArticle Lattice Site of Rare-Earth Ions in Stoichiometric Lithium Niobate Probed by OH Vibrational Spectroscopy
Crystals 2017, 7(8), 230; doi:10.3390/cryst7080230
Received: 7 July 2017 / Revised: 20 July 2017 / Accepted: 21 July 2017 / Published: 25 July 2017
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Abstract
Rare-earth (RE = Er3+, Nd3+, or Yb3+) ion-doped stoichiometric LiNbO3 crystals were grown by the Czochralski and the high-temperature top-seeded solution growth methods. For the 0.22–0.87 mol% concentration range of the RE oxides in the melt/solution,
[...] Read more.
Rare-earth (RE = Er3+, Nd3+, or Yb3+) ion-doped stoichiometric LiNbO3 crystals were grown by the Czochralski and the high-temperature top-seeded solution growth methods. For the 0.22–0.87 mol% concentration range of the RE oxides in the melt/solution, in addition to the well-known hydroxyl (OH) vibrational band in undoped stoichiometric LiNbO3, a new infrared absorption band was observed at about 3500 cm−1, similar to the case of the trivalent optical damage resistant (ODR) dopants In3+ and Sc3+. By comparing the frequencies and polarization dependences of the bands to those detected for ODR ion containing crystals, they are attributed to the stretching vibration of OH ions in RE3+Nb-OH complexes. Consequently, above a given concentration threshold, some of the rare-earth ions are assumed to occupy niobium sites in the LiNbO3 lattice. The same model is also suggested for RE-doped congruent LiNbO3 crystals containing over-threshold (>5 mol %) amounts of the Mg-co-dopant. Full article
Figures

Figure 1

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