Special Issue "Trends in Nonlinear Optical Materials"

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: 31 August 2020.

Special Issue Editor

Dr. Luca Rigamonti
Website
Guest Editor
Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Modena e Reggio Emilia, 41125 Modena, Italy
Interests: coordination chemistry; electronic modulation; structure-property correlation studies; Schiff base ligands; magnetic properties
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Special Issue Information

Dear Colleagues,

Nonlinear optics (NLO) started to be explored by Franken et al., in 1961, with the discovery of second-harmonic generation (SHG) or frequency doubling. That happened right after the construction of the first laser by Maiman in 1960, of which the electric field intensity was sufficient to induce the nonlinear response of matter. Since then, NLO has started finding several applications with a growing impact on today’s daily life in different areas, such as lasers, interaction with materials and information technology. The interest in this field has led to the synthesis of several compounds over the years, both organic molecules and coordination complexes, in order to provide coherent light of different wavelengths, materials interaction through multi-photon absorption (photodynamic therapy in medicine, optical power limiting applications, etc.), advanced spectroscopy and materials analysis, possible applications to communications and sensors, and so on. This Special Issue aims to collect new advances in the synthesis, and experimental and theoretical characterization of new materials, ranging from purely organic derivatives to transition metal and lanthanide complexes, coordination polymers and hybrid systems, and description of their linear and nonlinear optical properties, such as SHG, multi-photon absorption, etc.

Dr. Luca Rigamonti
Guest Editor

Manuscript Submission Information

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Keywords

  • nonlinear optics (NLO)
  • organic molecules
  • transition metals
  • lanthanides
  • coordination polymers
  • hybrid materials
  • optical properties
  • second-harmonic generation
  • multi-photon absorption
  • theoretical calculations

Published Papers (5 papers)

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Research

Open AccessArticle
Solid-State Nonlinear Optical Properties of Mononuclear Copper(II) Complexes with Chiral Tridentate and Tetradentate Schiff Base Ligands
Materials 2019, 12(21), 3595; https://doi.org/10.3390/ma12213595 - 01 Nov 2019
Abstract
Salen-type metal complexes have been actively studied for their nonlinear optical (NLO) properties, and push-pull compounds with charge asymmetry generated by electron releasing and withdrawing groups have shown promising results. As a continuation of our research in this field and aiming at solid-state [...] Read more.
Salen-type metal complexes have been actively studied for their nonlinear optical (NLO) properties, and push-pull compounds with charge asymmetry generated by electron releasing and withdrawing groups have shown promising results. As a continuation of our research in this field and aiming at solid-state features, herein we report on the synthesis of mononuclear copper(II) derivatives bearing either tridentate N2O Schiff bases L(a−c)− and pyridine as the forth ancillary ligand, [Cu(La−c)(py)](ClO4) (1ac), or unsymmetrically-substituted push-pull tetradentate N2O2 Schiff base ligands, [Cu(5-A-5′-D-saldpen/chxn)] (2ac), both derived from 5-substituted salicylaldehydes (sal) and the diamines (1R,2R)-1,2-diphenylethanediamine (dpen) and (1S,2S)-1,2-diaminocyclohexane (chxn). All compounds were characterized through elemental analysis, infrared and UV/visible spectroscopies, and mass spectrometry in order to guarantee their purity and assess their charge transfer properties. The structures of 1ac were determined via single-crystal X-ray diffraction studies. The geometries of cations of 1ac and of molecules 2ac were optimized through DFT calculations. The solid-state NLO behavior was measured by the Kurtz–Perry powder technique @1.907 µm. All chiral derivatives possess non-zero quadratic electric susceptibility (χ(2)) and an efficiency of about 0.15–0.45 times that of standard urea. Full article
(This article belongs to the Special Issue Trends in Nonlinear Optical Materials)
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Open AccessArticle
Effect of Conduction Band Non-Parabolicity on the Nonlinear Optical Properties in GaAs/Ga1−xAlxAs Double Semi-V-shaped Quantum Wells
Materials 2019, 12(1), 78; https://doi.org/10.3390/ma12010078 - 26 Dec 2018
Cited by 3
Abstract
In this paper, we investigate the effect of conduction band non-parabolicity (NPBE) on the third harmonic generation(THG), the linear and nonlinear intersub-band optical absorption coefficients (OACs) related with electronic states of double semi-V-shaped GaAs/Ga1−xAlxAs quantum wells(QWs) by [...] Read more.
In this paper, we investigate the effect of conduction band non-parabolicity (NPBE) on the third harmonic generation(THG), the linear and nonlinear intersub-band optical absorption coefficients (OACs) related with electronic states of double semi-V-shaped GaAs/Ga1−xAlxAs quantum wells(QWs) by using the compact-density-matrix approach. Simultaneously, the work is performed in the position dependent effective mass in order to compute the electronic structure for the system by the finite difference and self-consistent techniques. We also compare the results with and without considering NPBE. It is found that: (1) the NPBE has a significant influence on the sub-band energy levels of double semi-V-shaped QWs, and (2) the amplitude and position of the resonant peaks of the THG and nonlinear OACs in the case of considering NPBE show complicated behavior due to the energy dependent effective mass m*(E) where the energy value was chosen self-consistently. Full article
(This article belongs to the Special Issue Trends in Nonlinear Optical Materials)
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Open AccessArticle
Interplay of Thermo-Optic and Reorientational Responses in Nematicon Generation
Materials 2018, 11(10), 1837; https://doi.org/10.3390/ma11101837 - 27 Sep 2018
Cited by 5
Abstract
Employing several nematic liquid crystal mixtures, we investigate how the thermo-optic response of nonlinear birefringent soft-matter affects the propagation of light beams and the features of self-induced waveguides. We address the formation of optical spatial solitons and the control of their trajectories versus [...] Read more.
Employing several nematic liquid crystal mixtures, we investigate how the thermo-optic response of nonlinear birefringent soft-matter affects the propagation of light beams and the features of self-induced waveguides. We address the formation of optical spatial solitons and the control of their trajectories versus temperature, comparing the measurements with the expectations based on a simplified model, showing an excellent agreement. Moreover, in a guest–host mixture with an absorbing dye dopant, we study the competition between reorientational and thermal nonlinearities, demonstrating that the two processes can be adjusted independently in order to tune the soliton properties, i.e., trajectory and confinement strength. Our results are an important contribution to better comprehend the role played by material properties on linear and nonlinear beam propagation, as well as their exploitation for signal processing and addressing. Full article
(This article belongs to the Special Issue Trends in Nonlinear Optical Materials)
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Open AccessArticle
Composition Relation between Nonlinear Bloch Waves and Gap Solitons in Periodic Fractional Systems
Materials 2018, 11(7), 1134; https://doi.org/10.3390/ma11071134 - 04 Jul 2018
Cited by 5
Abstract
Evolution of beams in nonlinear optical media with a fractional-order diffraction is currently attracting a growing interest. We address the existence of linear and nonlinear Bloch waves in fractional systems with a periodic potential. Under a defocusing nonlinearity, nonlinear Bloch waves at the [...] Read more.
Evolution of beams in nonlinear optical media with a fractional-order diffraction is currently attracting a growing interest. We address the existence of linear and nonlinear Bloch waves in fractional systems with a periodic potential. Under a defocusing nonlinearity, nonlinear Bloch waves at the centers or edges of the first Brillouin zone bifurcate from the corresponding linear Bloch modes at different band edges. They can be constructed by directly copying a fundamental gap soliton (in one lattice site) or alternatively copying it and its mirror image to infinite lattice channels. The localized truncated-Bloch-wave solitons bridging nonlinear Bloch waves and gap solitons are also revealed. We thus prove that fundamental gap solitons can be used as unit cells to build nonlinear Bloch waves or truncated-Bloch-wave solitons, even in fractional configurations. Our results provide helpful hints for understanding the dynamics of localized and delocalized nonlinear modes and the relation between them in periodic fractional systems with an optical nonlinearity. Full article
(This article belongs to the Special Issue Trends in Nonlinear Optical Materials)
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Open AccessArticle
The Combined Influence of Hydrostatic Pressure and Temperature on Nonlinear Optical Properties of GaAs/Ga0.7Al0.3As Morse Quantum Well in the Presence of an Applied Magnetic Field
Materials 2018, 11(5), 668; https://doi.org/10.3390/ma11050668 - 25 Apr 2018
Cited by 6
Abstract
Studies aimed at understanding the nonlinear optical (NLO) properties of GaAs/Ga0.7Al0.3As morse quantum well (QW) have focused on the intersubband optical absorption coefficients (OACs) and refractive index changes (RICs). These studies have taken two complimentary approaches: (1) The compact-density-matrix [...] Read more.
Studies aimed at understanding the nonlinear optical (NLO) properties of GaAs/Ga0.7Al0.3As morse quantum well (QW) have focused on the intersubband optical absorption coefficients (OACs) and refractive index changes (RICs). These studies have taken two complimentary approaches: (1) The compact-density-matrix approach and iterative method have been used to obtain the expressions of OACs and RICs in morse QW. (2) Finite difference techniques have been used to obtain energy eigenvalues and their corresponding eigenfunctions of GaAs/Ga0.7Al0.3As morse QW under an applied magnetic field, hydrostatic pressure, and temperature. Our results show that the hydrostatic pressure and magnetic field have a significant influence on the position and the magnitude of the resonant peaks of the nonlinear OACs and RICs. Simultaneously, a saturation case is observed on the total absorption spectrum, which is modulated by the hydrostatic pressure and magnetic field. Physical reasons have been analyzed in depth. Full article
(This article belongs to the Special Issue Trends in Nonlinear Optical Materials)
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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.

1. Review

Biomaterials as second harmonic probes for bioimaging and diagnostic applications

Ming Ni, Shuangmu Zhuo

2. Article

Quinacridone-based nonlinear optical materials: From electronic, optical properties to two photon absorption

Yuanzuo Li

Abstract: Organic molecules with large second-order nonlinear optical (NLO) properties have been the focus of sizeable research efforts. Compared with conventional inorganic crystals, organic compounds have some merits: (a) optical damage threshold, and lower dielectric constant; (b) fast response time (10–14 s); (c) they are low-priced to produce; and (d) optical properties of compounds can be tunable by using chemical modification. Therefore, the compounds with D–A configuration are the archetypal molecules for quadratic hyperpolarizability, which were also found to exhibit two- or three-photon absorption cross-sections. Here, geometric structures, electronic, spectra and nonlinear optical properties (NLO) of Quinacridone-based NLO materials are investigated by means of quantum chemistry method and the response theory. The micro-mechanisms of first hyperpolarizability were explained on the basis of the two-level models, and charge difference density methods demonstrated mechanism of charge transfer under photo-excitation. Calculations of two-photon absorption (TPA) for Quinacridone-based molecules were performed to develop their potential application on TPA materials. Additionally, some molecules were designed by replacing electron donor moiety (such as triphenylamine, N,N-dimethylaniline, carbazole and azacrown ether and so on) to tune the NLO parameters in order to develop their utility in NLO materials.


 

 

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