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Zheshuai Lin - One of the best experts on this subject based on the ideXlab platform.
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giant Optical Anisotropy in the uv transparent 2d nonlinear Optical material sc io3 2 no3
Angewandte Chemie, 2021Co-Authors: Xingxing Jiang, Zheshuai Lin, Zujian Wang, Zhipeng Huang, Xifa Long, Mark G Humphrey, Chi ZhangAbstract:Birefringence is a fundamental Optical property for linear and nonlinear Optical (NLO) materials. Thus far, it has proved to be very difficult to engineer large birefringence in Optical crystals functioning in the UV region. Herein, we report the first 2D rare-earth iodate-nitrate crystal Sc(IO3 )2 (NO3 ) (SINO), which is shown to exhibit giant Optical Anisotropy. Air-stable SINO possesses a short UV absorption edge (298 nm), a strong NLO response (4.0 times that of benchmark KH2 PO4 ) for the nitrate family, and the largest birefringence (Δn=0.348 at 546 nm) of inorganic oxide Optical crystals. The unusually large birefringence and NLO response can be attributed to an optimized 2D layered structure, combined with highly polarizable and anisotropic building units [IO3 ]- and [NO3 ]- . These findings will facilitate the development of UV linear and NLO materials with giant Optical Anisotropy and promote their potential application in optoelectronic devices.
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giant Optical Anisotropy in the uv transparent 2d nonlinear Optical material sc io3 2 no3
Angewandte Chemie, 2020Co-Authors: Xingxing Jiang, Zheshuai Lin, Zujian Wang, Zhipeng Huang, Xifa Long, Mark G Humphrey, Chi ZhangAbstract:Birefringence is a fundamental Optical property for linear and nonlinear Optical (NLO) materials. Thus far, it has proved to be very difficult to engineer large birefringence in Optical crystals functioning in the UV region. Herein, we report the first 2D rare-earth iodate-nitrate crystal Sc(IO3)2(NO3) (SINO), which is shown to exhibit giant Optical Anisotropy. Air-stable SINO possesses a short UV absorption edge (298 nm), a strong NLO response (4.0 times that of benchmark KH2PO4) for the nitrate family, and the largest birefringence (Δn = 0.348 at 546 nm) of inorganic oxide Optical crystals. The unusually large birefringence and NLO response can be attributed to an optimized 2D layered structure, combined with highly polarizable and anisotropic building units [IO3]- and [NO3]-. These findings will facilitate development of UV linear and NLO materials with giant Optical Anisotropy, and promote their potential applications in optoelectronic devices.
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lio4 tetrahedra lock the alignment of π conjugated layers to maximize Optical Anisotropy in metal hydroisocyanurates
Inorganic chemistry frontiers, 2019Co-Authors: Xianghe Meng, Fei Liang, Jian Tang, Kaijin Kang, Tixian Zeng, Wenlong Yin, Bin Kang, Zheshuai LinAbstract:Parallel and compact alignments of π-conjugated anions in a crystal are of importance to maximize the Optical Anisotropy of crystalline materials. Our attempts to design colossal birefringence in metal hydroisocyanurates M2N(H2C3N3O3)4·6H2O (M/N = Li/Ca and Na/Ba) were successful using cation coordination control. In particular, Li2Ca(H2C3N3O3)4·6H2O (LCHCY) shows the largest birefringence (Δn = 0.407@800 nm) among all the reported metal cyanurates and hydroisocyanurates, even larger than that of 2D BN layers, due to the reinforced lock effect of basal oxygens from LiO4 tetrahedra. LCHCY is a novel promising ultraviolet birefringent crystal with a short ultraviolet cut-off and a wide transmission range.
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parallel alignment of π conjugated anions in hydroisocyanurates enhancing Optical Anisotropy
Inorganic Chemistry, 2019Co-Authors: Xianghe Meng, Fei Liang, Zheshuai Lin, Jian Tang, Kaijin Kang, Tixian Zeng, Wenlong Yin, Ruixin Guo, Mingjun XiaAbstract:Birefringent crystals with Optical Anisotropy, which are employed to modulate the polarization of light, play a vital role in many fields of the Optical industry. In this Communication, two mixed alkali metal hydroisocyanurates, RbLi(H2C3N3O3)2·2H2O (I) and CsLi(H2C3N3O3)2·2H2O (II), were synthesized by a simple aqueous solution method, and they feature layered structures composed of ∞2[H2C3N3O3]- ribbons through hydrogen bonds with the separation of water molecules and alkali cations. They exhibit a simultaneously short ultraviolet cutoff and giant birefringence, resulting from the perfect parallel alignment of π-conjugated (H2C3N3O3)- anions. Interestingly, the first-principles calculations elucidated that the electronic states and Optical properties are slightly different owing to the distinct p-π interaction between alkaline metals and the (H2C3N3O3)- group despite the isostructural crystallographic lattice.
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ba2m c3n3o3 2 m mg ca potential uv birefringent materials with strengthened Optical Anisotropy originating from the c3n3o3 3 group
Journal of Materials Chemistry C, 2018Co-Authors: Fei Liang, Zheshuai Lin, Wenlong Yin, Yangwu Guo, Jiyong Yao, Guochun Zhang, Chuangtian ChenAbstract:Demands for UV birefringent materials are growing dramatically owing to the rapid development of ultraviolet technology. Here, a new family of UV birefringent materials, Ba2Mg(C3N3O3)2 (BMCY) and Ba2Ca(C3N3O3)2 (BCCY), have been successfully discovered. It is the first time that the excellent birefringent properties of cyanurates have been studied. These materials exhibit an extremely large birefringence (Δn = 0.728–0.351 and 0.771–0.346 from 230 nm to 800 nm for BMCY and BCCY, respectively), much larger than that of the commercial UV birefringent crystal α-BaB2O4 (α-BBO) (Δn = 0.12@532 nm). Our study indicates that the impressive Optical properties of BMCY and BCCY stem from the strengthened Optical Anisotropy of the planar (C3N3O3)3− group compared with the isoelectronic (B3O6)3− group. Besides, its congruent-melting properties make it feasible to grow a bulk crystal by the Bridgman–Stockbarger technique. The extraordinary properties of BMCY and BCCY may shed light on a new path to explore birefringent materials for practical application.
Fei Liang - One of the best experts on this subject based on the ideXlab platform.
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lio4 tetrahedra lock the alignment of π conjugated layers to maximize Optical Anisotropy in metal hydroisocyanurates
Inorganic chemistry frontiers, 2019Co-Authors: Xianghe Meng, Fei Liang, Jian Tang, Kaijin Kang, Tixian Zeng, Wenlong Yin, Bin Kang, Zheshuai LinAbstract:Parallel and compact alignments of π-conjugated anions in a crystal are of importance to maximize the Optical Anisotropy of crystalline materials. Our attempts to design colossal birefringence in metal hydroisocyanurates M2N(H2C3N3O3)4·6H2O (M/N = Li/Ca and Na/Ba) were successful using cation coordination control. In particular, Li2Ca(H2C3N3O3)4·6H2O (LCHCY) shows the largest birefringence (Δn = 0.407@800 nm) among all the reported metal cyanurates and hydroisocyanurates, even larger than that of 2D BN layers, due to the reinforced lock effect of basal oxygens from LiO4 tetrahedra. LCHCY is a novel promising ultraviolet birefringent crystal with a short ultraviolet cut-off and a wide transmission range.
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a rich structural chemistry in π conjugated hydroisocyanurates layered structures of a2b h2c3n3o3 4 nh2o a k rb cs b mg ca n 4 10 with high ultraviolet transparency and strong Optical Anisotropy
Dalton Transactions, 2019Co-Authors: Xianghe Meng, Fei Liang, Jian Tang, Kaijin Kang, Qian HuangAbstract:Ultraviolet (UV) transparent birefringent crystals are indeed indispensable for modern optoelectronics and polarizer devices. Herein, mixed alkali/alkali-earth metal hydroisocyanurates A2B(H2C3N3O3)4·nH2O (A = K, Rb, Cs; B = Mg, Ca; n = 4, 10) were synthesized and their thermal, vibrational and Optical properties were characterized in detail. Although they crystallize in different crystallographic point groups, all compounds feature quasi-two-dimensional layered structures built by the 2∞[H2C3N3O3]− ribbons through hydrogen bonds, separated by water molecules and cations. Benefiting from the delocalized π-conjugated bonds and planar structural configuration of (H2C3N3O3)− groups, they show a concurrently short ultraviolet absorption edge (λcut-off ≈ 230 nm) and strong Optical Anisotropy (Δn ≈ 0.37 at 800 nm), twice larger than that of the benchmark UV birefringent crystal calcite.
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parallel alignment of π conjugated anions in hydroisocyanurates enhancing Optical Anisotropy
Inorganic Chemistry, 2019Co-Authors: Xianghe Meng, Fei Liang, Zheshuai Lin, Jian Tang, Kaijin Kang, Tixian Zeng, Wenlong Yin, Ruixin Guo, Mingjun XiaAbstract:Birefringent crystals with Optical Anisotropy, which are employed to modulate the polarization of light, play a vital role in many fields of the Optical industry. In this Communication, two mixed alkali metal hydroisocyanurates, RbLi(H2C3N3O3)2·2H2O (I) and CsLi(H2C3N3O3)2·2H2O (II), were synthesized by a simple aqueous solution method, and they feature layered structures composed of ∞2[H2C3N3O3]- ribbons through hydrogen bonds with the separation of water molecules and alkali cations. They exhibit a simultaneously short ultraviolet cutoff and giant birefringence, resulting from the perfect parallel alignment of π-conjugated (H2C3N3O3)- anions. Interestingly, the first-principles calculations elucidated that the electronic states and Optical properties are slightly different owing to the distinct p-π interaction between alkaline metals and the (H2C3N3O3)- group despite the isostructural crystallographic lattice.
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ba2m c3n3o3 2 m mg ca potential uv birefringent materials with strengthened Optical Anisotropy originating from the c3n3o3 3 group
Journal of Materials Chemistry C, 2018Co-Authors: Fei Liang, Zheshuai Lin, Wenlong Yin, Yangwu Guo, Jiyong Yao, Guochun Zhang, Chuangtian ChenAbstract:Demands for UV birefringent materials are growing dramatically owing to the rapid development of ultraviolet technology. Here, a new family of UV birefringent materials, Ba2Mg(C3N3O3)2 (BMCY) and Ba2Ca(C3N3O3)2 (BCCY), have been successfully discovered. It is the first time that the excellent birefringent properties of cyanurates have been studied. These materials exhibit an extremely large birefringence (Δn = 0.728–0.351 and 0.771–0.346 from 230 nm to 800 nm for BMCY and BCCY, respectively), much larger than that of the commercial UV birefringent crystal α-BaB2O4 (α-BBO) (Δn = 0.12@532 nm). Our study indicates that the impressive Optical properties of BMCY and BCCY stem from the strengthened Optical Anisotropy of the planar (C3N3O3)3− group compared with the isoelectronic (B3O6)3− group. Besides, its congruent-melting properties make it feasible to grow a bulk crystal by the Bridgman–Stockbarger technique. The extraordinary properties of BMCY and BCCY may shed light on a new path to explore birefringent materials for practical application.
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cyano based materials with giant Optical Anisotropy and second harmonic generation effect
Inorganic Chemistry, 2018Co-Authors: Lei Kang, Fei Liang, Zheshuai Lin, Feng Liu, Bing HuangAbstract:It is a huge challenge to achieve giant Optical Anisotropy (e.g., birefringence) over a wide region from infrared (IR) to ultraviolet (UV) spectroscopy. This is mainly due to the lack of ideal Optical motifs, which should have giant structural Anisotropy with a wide transparent range. Especially in the field of nonlinear Optical (NLO) materials, polar motifs with giant Optical Anisotropy are extremely scarce, but they are favorable to exhibit strong second harmonic generation (SHG) effect and phase-matching capacity. On the basis of analysis of microstructure and macro Optical property, in this study, we focus on one-dimensional chained cyano (CN) motif and surprisingly find that it can exhibit sufficiently large Optical Anisotropy and SHG effect from IR to UV regions. Therefore, it is reasonable to believe that the CN motif can be considered as a novel NLO material gene, which was totally ignored in the previous studies. Interestingly, the CN-gene can be integrated into various coordination structures, s...
Nobuhiro Kawatsuki - One of the best experts on this subject based on the ideXlab platform.
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incident angle dependence reduced polarization grating performance by using Optically biaxial polymer liquid crystal
Optics Letters, 2019Co-Authors: Ryusei Momosaki, Nobuhiro Kawatsuki, Kazunari Ashikawa, Moritsugu Sakamoto, Kohei Noda, Tomoyuki Sasaki, Hiroshi OnoAbstract:We have succeeded in forming a polarization grating whose polarization diffraction properties are extremely independent of the incident angle by using polymer liquid crystal exhibiting biaxial Optical Anisotropy. It is considered that the extension of the Optical path length and the decrease in the effective amplitude of Optical Anisotropy due to oblique incidences are offset by the biaxial Optical Anisotropy and, as a result, the retardation is compensated. The properties of this developed device have been experimentally demonstrated and theoretically explained.
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influence of alkylene spacer length on thermal enhancement of photoinduced Optical Anisotropy in photo cross linkable liquid crystalline polymeric films and their composites with non liquid crystalline monomers
Macromolecules, 2007Co-Authors: Nobuhiro Kawatsuki, Ryoji Tsutsumi, Hirofumi Takatsuka, Takeya SakaiAbstract:Thermally enhanced photoinduced reorientation in a photo-cross-linkable liquid crystalline polymethacrylate comprised of 4-(ω-cinnamoyloxyalkyloxy)biphenyl side groups is investigated by irradiating with linearly polarized ultraviolet (LPUV) light and subsequent annealing at elevated temperatures. An odd−even effect of the alkylene spacer length between the cinnamate end group and biphenyl group on the transition temperatures of the polymer, photoinduced Optical Anisotropy, and thermal amplification of the in-plane molecular reorientation of thin films are observed. Because of the higher straight-line characteristics of the mesogenic side groups with an odd number alkylene spacer, the axis-selectivity of the anisotropic photoreaction of the photoreactive groups is greater than that with an even number, which leads to a larger photoinduced Optical Anisotropy and effective molecular reorientation. Finally, the cooperative reorientation in composites of the polymer and nonliquid crystalline monomer is explor...
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photoinduced Optical Anisotropy based on axis selective triplet energy transfer and thermally enhanced reorientation in a photo cross linkable liquid crystalline polymer film
Macromolecules, 2005Co-Authors: Nobuhiro Kawatsuki, Takeshi Tachibana, Kunihisa KatoAbstract:An axis-selective photosensitized reaction of a photo-cross-linkable liquid crystalline polymer film doped with a triplet photosensitizer (TPS) based on axis-selective triplet energy transfer achieved a thermally enhanced molecular reorientation of the film using linearly polarized (LP) 405 nm light. Four types of TPS4,4‘-(N,N‘-bis(diethylamino))benzophenone (DBP), 4-(N-diethylamino)benzophenone (BP), 5-nitroacenaphthene (AN), and p-nitroaniline (pNA)were used to compare the efficiency of the axis selection of the energy transfer. In all cases, the photoreactivity of a film was generated when doping with less than 9 wt % of TPS. The quenching sphere played a role in the photoreactivity, while the photoinduced Optical Anisotropy depended on the type of TPS. The axis-selective photoexcitation of TPS and the polarization-preserved energy transfer to the photoreactive mesogenic groups dominated the photoinduced Optical Anisotropy as well as the thermal enhancement of the molecular reorientation.
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Optical Anisotropy of a photoreacted side chain liquid crystalline polymer induced by linearly polarized uv light
Journal of Polymer Science Part A, 1998Co-Authors: Nobuhiro Kawatsuki, Hirohumi Takatsuka, Tohei Yamamoto, Osamu SangenAbstract:Linearly polarized (LP) UV photoreaction of a photo-crosslinkable side-chain liquid-crystalline polymer (SLCP) containing photoreactive cinnamoyl and biphenyl mesogenic groups (1) was studied. The Optical Anisotropy of the polymer film was induced by the LP-UV photoreaction and was investigated by the temperature-controlled polarized UV absorption spectroscopy and polarized FT-IR measurements. The reorientation of the nonreacted mesogenic groups along to the E direction of the incident LP-UV light during the photoreaction occurred at the LC temperature range of the polymer, and the induced birefringence Δn was about 0.02. Because of the high-density photo-crosslinking, the LP-UV photoreacted film showed orientational stability up to 160°C. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 1521–1526, 1998
Federico Capasso - One of the best experts on this subject based on the ideXlab platform.
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engineering phonon polaritons in van der waals heterostructures to enhance in plane Optical Anisotropy
Science Advances, 2019Co-Authors: Kundan Chaudhary, Michele Tamagnone, Mehdi Rezaee, Kwabena D Bediako, Antonio Ambrosio, Philip Kim, Federico CapassoAbstract:Van der Waals (vdW) heterostructures assembled from layers of two-dimensional materials have attracted considerable interest due to their novel Optical and electrical properties. Here, we report a scattering-type scanning near-field Optical microscopy study of hexagonal boron nitride on black phosphorus (h-BN/BP) heterostructures, demonstrating the first direct observation of in-plane anisotropic phonon polariton modes in vdW heterostructures. Notably, the measured in-plane Optical Anisotropy along the armchair and zigzag crystal axes exceeds the ratio of refractive indices of BP in the x-y plane. We explain that this enhancement is due to the high confinement of the phonon polaritons in h-BN. We observe a maximum in-plane Optical Anisotropy of αmax = 1.25 in the frequency spectrum at 1405 to 1440 cm-1. These results provide new insights into the behavior of polaritons in vdW heterostructures, and the observed Anisotropy enhancement paves the way to novel nanophotonic devices and to a new way to characterize Optical Anisotropy in thin films.
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engineering phonon polaritons in van der waals heterostructures to enhance in plane Optical Anisotropy
arXiv: Optics, 2018Co-Authors: Kundan Chaudhary, Michele Tamagnone, Mehdi Rezaee, Kwabena D Bediako, Antonio Ambrosio, Philip Kim, Federico CapassoAbstract:Van der Waals heterostructures assembled from layers of 2D materials have attracted considerable interest due to their novel Optical and electrical properties. Here we report a scattering-type scanning near field Optical microscopy study of hexagonal boron nitride on black phosphorous (h-BN/BP) heterostructures, demonstrating the first direct observation of in-plane anisotropic phonon polariton modes in vdW heterostructures. Strikingly, the measured in-plane Optical Anisotropy along armchair and zigzag crystal axes exceeds the ratio of refractive indices of BP in the x-y plane. We explain that this enhancement is due to the high confinement of the phonon polaritons in h-BN. We observe a maximum in-plane Optical Anisotropy of {\alpha}_max=1.25 in the 1405-1440 cm-1 frequency spectrum. These results provide new insights on the behavior of polaritons in vdW heterostructures, and the observed Anisotropy enhancement paves the way to novel nanophotonic devices and to a new way to characterize Optical Anisotropy in thin films.
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giant birefringence in Optical antenna arrays with widely tailorable Optical Anisotropy
Proceedings of the National Academy of Sciences of the United States of America, 2012Co-Authors: Mikhail A Kats, Patrice Genevet, Guillaume Aoust, Nanfang Yu, Romain Blanchard, Francesco Aieta, Z Gaburro, Federico CapassoAbstract:The manipulation of light by conventional Optical components such as lenses, prisms, and waveplates involves engineering of the wavefront as it propagates through an Optically thick medium. A unique class of flat Optical components with high functionality can be designed by introducing abrupt phase shifts into the Optical path, utilizing the resonant response of arrays of scatterers with deeply subwavelength thickness. As an application of this concept, we report a theoretical and experimental study of birefringent arrays of two-dimensional (V- and Y-shaped) Optical antennas which support two orthogonal charge-oscillation modes and serve as broadband, anisotropic Optical elements that can be used to locally tailor the amplitude, phase, and polarization of light. The degree of Optical Anisotropy can be designed by controlling the interference between the waves scattered by the antenna modes; in particular, we observe a striking effect in which the Anisotropy disappears as a result of destructive interference. These properties are captured by a simple, physical model in which the antenna modes are treated as independent, orthogonally oriented harmonic oscillators.
Zhihua Yang - One of the best experts on this subject based on the ideXlab platform.
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hydroxyfluorooxoborate na b3o3f2 oh 2 b oh 3 optimizing the Optical Anisotropy with heteroanionic units for deep ultraviolet birefringent crystals
Angewandte Chemie, 2021Co-Authors: Congcong Jin, Zhihua Yang, Xuping Shi, Hao Zeng, Shujuan Han, Zhen Chen, Miriding Mutailipu, Shilie PanAbstract:Maximizing the Optical Anisotropy in birefringent materials has emerged as an efficient route for modulating the polarization-dependent light propagation. Currently, the generation of deep-ultraviolet (deep-UV) polarized light below 200 nm is essential but challenging due to the interdisciplinary significance and insufficiency of high-performing birefringent crystals. Herein, by introducing multiple heteroanionic units, the first sodium difluorodihydroxytriborate-boric acid Na[B3 O3 F2 (OH)2 ]⋅[B(OH)3 ] has been characterized as a novel deep-UV birefringent crystal. Two rare heteroanionic units, [B3 O3 F2 (OH)2 ] and [B(OH)3 ], optimally align to induce large Optical Anisotropy and also the dangling bonds are eliminated with hydrogens, which results in an extremely large birefringence and band gap. The well-ordered OH/F anions in [B3 O3 F2 (OH)2 ] and [B(OH)3 ] were identified and confirmed by various approaches, and also the origin of large birefringence was theoretically discussed. These results confirm the feasibility of utilizing hydrogen involved heteroanionic units to design crystals with large birefringence, and also expand the alternative system of deep-UV birefringent crystals with new hydroxyfluorooxoborates.
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enhanced Optical Anisotropy via dimensional control in alkali metal chalcogenides
Physical Chemistry Chemical Physics, 2020Co-Authors: Jing Mei Min, Shilie Pan, Ailijiang Abudurusuli, Zhihua YangAbstract:Crystals with both large birefringence and wide transparent range are suitable for broad applications in the areas of Optical communications, the laser industry and modulation of the light polarization requirement. In this work, to assist the design of urgently needed crystals with large birefringence in the infrared (IR) region, typical alkali-metal chalcogenides, KPSe6, Na2Ge2Se5, and Li2In2GeSe6 have been studied. They exhibit a hierarchical characteristic in the calculated birefringence by about 0.21, 0.11, and 0.04, respectively. To explore the origin of the birefringence difference, the polarizability Anisotropy and the effect of electron distribution Anisotropy are analyzed. The alkali-metal chalcogenides KPSe6, Na2Ge2Se5, and Li2In2GeSe6 feature infinite one-dimensional (1D) chains of [PSe6], 2D anionic framework of [Ge2Se5] layers and 3D [In2GeSe9] networks, respectively. It is found that the anionic group with low-dimensional configuration could enhance polarizability Anisotropy and render large birefringence for the macroscopic structure. This provides evidence that a low-dimensionality configuration in the structure would be beneficial for the enhancement of Optical Anisotropy, which can motivate the exploration and design of novel IR birefringent materials.
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module guided design scheme for deep ultraviolet nonlinear Optical materials
Journal of the American Chemical Society, 2018Co-Authors: Zhihua Yang, Hongwei Yu, Zhi Li, Cong Hu, Kenneth R PoeppelmeierAbstract:Design of functional materials with targeted properties is a challenge because of the diversity of their potential structures. The functional performances of materials are mainly determined by the chemistry and electronic structure of modules consisting of local atomic groups with special arrangements. Tetrahedral modules are excellent modules for designing deep-ultraviolet/ultraviolet (UV) nonlinear Optical (NLO) materials, but they are rarely favored due to their unpredictable Optical Anisotropy and second harmonic generation (SHG) response. In this work, we have developed a module-guided ab initio approach for evaluating the Optical Anisotropy of tetrahedral modules. The application of this method indicates that the tetrahedral modules with a specific arrangement will enhance the Optical Anisotropy of materials. With the functional modules consisting of tetrahedral modules and rare-earth cations, new high-performance rare-earth phosphates were assembled. These materials are promising deep-UV NLO materi...
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enhancing Optical Anisotropy of crystals by optimizing bonding electron distribution in anionic groups
Chemical Communications, 2017Co-Authors: Binghua Lei, Zhihua Yang, Shilie PanAbstract:The response electron distribution Anisotropy (REDA) approximation was proposed to analyze the relationship between Optical Anisotropy and distribution of bonding electrons in compounds. Further, the Optical Anisotropy of tetrahedral chromophore compounds with common small birefringence can be enhanced and excellent nonlinear Optical properties can be obtained by optimizing the distribution.
