Special Issue "Localized Optical Modes in Liquid Crystals"

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

Deadline for manuscript submissions: 20 September 2019.

Special Issue Editors

Guest Editor
Prof. Dr. Vladimir A. Belyakov E-Mail
Landau Institute for Theoretical Physics, Russian Academy of Sciences, Moscow, Russia
Guest Editor
Dr. Sergei V. Semenov E-Mail
National Investigation Centre Kurchatov Institute, Moscow, Russia
Interests: spiral media; liquid crystals; localized optical modes; DFB lasing

Special Issue Information

Dear Colleagues,

A new field of optical research has emerged over the last three recent decades that relates to the optics of periodic structures, with the value of periodicity comparable to the optical wavelength, which has been named photonics. Photonics has revealed many important phenomena that are well applied in the optical wavelength range. The reason for this is related to the fact that virtually all photonics-related effects are within the capacity of experimental observation at the contemporary level of optical techniques, while most of the corresponding effects in the X-ray wavelength range (where photonics was invented in the beginning of 20th century, under the name "X-ray diffraction") are out of the capacity of experimental observation at the present level of X-ray techniques. Photonics researches have shown that many photonics-related optical processes are more efficient than the corresponding processes in homogeneous media; a known example is a low threshold lasing. The photonics terminology proposes the term "photonic crystal", related to a periodic medium whose period value is in the range of the optical wavelengths, in order to distinguish the photonic crystals from the conventional crystals. In the proposed issue, a special type of photonic crystal is studied, namely spiral photonic liquid crystals. This kind of photonic crystal has, at any rate, two essential advantages compared with the conventional crystals. One of them, a theoretical one, is connected with the existence of a simple exact solution of the Maxwell's equations, allowing for the development of an analytical theory of the photonic liquid crystal optics. The second, an experimental one, is connected with the liquid crystal softness, allowing for their parameters to be easily modified by weak external actions (applied electric and magnetic fields, temperature changing, and so on), which is important for achieving a needed set of parameters for the experiment. It is why the studies of the photonic effects in liquid crystals are of interest, not only for the physics of liquid crystals themselves, but also for the whole solid-state physics, because liquid crystals may be regarded as model objects in studies of solid-state effects. The main objects of study for the proposed issue are localized optical modes in liquid crystals, so called, edge (EM) and defect (DM) modes. It was demonstrated that many optical phenomena occurring at the frequencies of localized modes revealed unusual properties that could be used for efficient applications of the corresponding phenomena—for example, efficient frequency conversion, low threshold lasing, and so on. These features are the main reasons for producing the proposed Special Issue. The Special Issue on “Localized Optical Modes in Liquid Crystals” is intended to provide a unique international forum aimed at covering a broad description of the results, involving the optics of photonic crystal as linear or nonlinear, and, especially, lasing. Scientists working in a wide range of disciplines are invited to contribute to this cause.

The topics summarized under the keywords broadly cover examples of the greater number of sub-topics in mind. The volume is open for any innovative contributions involving all aspects of the photonic crystal optics in particular related to the edge (EM) and defect (DM) modes.

Prof. Dr. Vladimir A. Belyakov
Dr. Sergei V. Semenov
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 1400 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

  • Interaction of radiation with the matter
  • Liquid crystals
  • Localized optical modes
  • Surface anchoring in liquid crystals

Published Papers (1 paper)

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Research

Open AccessArticle
The Field-Induced Stop-Bands and Lasing Modes in CLC Layers with Deformed Lying Helix
Crystals 2019, 9(9), 469; https://doi.org/10.3390/cryst9090469 - 08 Sep 2019
Abstract
Waveguide optical properties of a cholesteric liquid crystal (CLC) layer with a deformed lying helix (DLH) have been studied by numerical simulations using the finite difference time domain method. The DLH structure, when the helix’s axis is oriented in plane of a CLC [...] Read more.
Waveguide optical properties of a cholesteric liquid crystal (CLC) layer with a deformed lying helix (DLH) have been studied by numerical simulations using the finite difference time domain method. The DLH structure, when the helix’s axis is oriented in plane of a CLC layer, is induced by an electric field in a virtual CLC cell with periodic (planar/homeotropic) boundary conditions at one of the alignment surfaces. This in-plane helical structure is stable only in a permanently applied electric field providing the helix deformation. In this work the polarized light reflectance spectra have been studied at different electric fields and light impingement into a waveguide formed by the DLH layer. It is found that for light propagating along the helix axis the reflectance spectrum has multiple stop-bands centred at wavelengths , which is different from set of bands located at , and characteristic of CLC spectra for the Grandjean-plane textures subjected to distortion by an electric or magnetic field perpendicular to the helix axis, where j is a natural number, p is the helix pitch and is the average refractive index. Each of the higher order (j > 1) bands consists of three polarization-dependent sub-bands. In the case of an amplifying CLC DLH layer, depending on an extent of the helix deformation, the lasing modes can be excited at different edges of the sub-bands. While at the strongest deformation the lasing is preferable at the edges of the central sub-band; a lower extent of deformation makes favourable conditions for the lasing at edges of the two other sub-bands. Full article
(This article belongs to the Special Issue Localized Optical Modes in Liquid Crystals)

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Chiral Optical Tamm States at the Interface between a Cholesteric and an All-Dielectric Polarization-Preserving Anisotropic Mirror
Authors: Natalya V. Rudakova, Ivan V. Timofeev, Rashid G. Bikbaev, Maxim V. Pyatnov, Stepan Ya. Vetrov, Wei Lee

Title: Magnetic Field Induced Macroscopic Alignment of Liquid-crystalline Lanthanide Complexes
Authors: E.V. Aksenova, L.A. Dobrun, A.P. Kovshik, E. I. Ryumtsev, I.M. Tambovtcev

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