scholarly journals Twisted Materials: A New Twist for Materials Science: The Formation of Chiral Structures Using the Angular Momentum of Light (Advanced Optical Materials 14/2019)

2019 ◽  
Vol 7 (14) ◽  
pp. 1970052 ◽  
Author(s):  
Takashige Omatsu ◽  
Katsuhiko Miyamoto ◽  
Kohei Toyoda ◽  
Ryuji Morita ◽  
Yoshihiko Arita ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Optical Materials ◽  
Materials Science ◽  
Chiral Structures

scholarly journals A New Twist for Materials Science: The Formation of Chiral Structures Using the Angular Momentum of Light

2019 ◽  
Vol 7 (14) ◽  
pp. 1801672 ◽  
Author(s):  
Takashige Omatsu ◽  
Katsuhiko Miyamoto ◽  
Kohei Toyoda ◽  
Ryuji Morita ◽  
Yoshihiko Arita ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Materials Science ◽  
Chiral Structures

scholarly journals Preview: 1989 MRS Spring Meeting

MRS Bulletin ◽  
1989 ◽  
Vol 14 (3) ◽  
pp. 51-55
Keyword(s):  
Optical Materials ◽  
Materials Science ◽  
Magnetic Films ◽  
Research Society ◽  
Joint Session ◽  
Linus Pauling ◽  
Spring Meeting ◽  
Materials Research ◽  
The Town

The 1989 Spring Meeting of the Materials Research Society will be held at the Town and County Hotel in San Diego, with events spanning April 22-29. Meeting Chairs Robin Farrow, Dick Siegel and Angelica Stacy have developed a program of 16 technical symposia that reflect the continuing key role of materials science in the development of both mature and emerging technologies.Several new topics will reflect emerging areas, including materials for optical storage of information (Symposium F), ultrathin magnetic films (Symposium G), and materials problems of infrastructure (Symposium P). A special workshop will provide a technology update on diamond films (Symposium P) and will feature a joint session with Symposium H, Optical Materials: Processing and Science.Plenary speaker Linus Pauling, research professor at the Linus Pauling Institute of Science and Medicine, will discuss quasicrystals, materials whose atomic structure displays perfect five-fold symmetry, but whose atomic pattern is never exactly repeated as it would be in conventional crystals. During the Plenary Session MRS will also recognize graduate students who have made outstanding contributions as authors or co-authors of papers presented at the 1989 Spring Meeting.

Thermotropic Chiral Nematic Polymers as Optical Materials

1989 ◽  
Vol 175 ◽  
Author(s):  
S.H. Chen ◽  
M.L. Tsai ◽  
S.D. Jacobs
Keyword(s):  
Optical Materials ◽  
Helical Structure ◽  
Structural Features ◽  
Optically Active ◽  
Structure Property ◽  
Chiral Compound ◽  
Structure Property Relationships ◽  
Chiral Nematic ◽  
Chiral Structures ◽  
Nematic Polymers

AbstractChiral nematic copolymers based on optically active cholesterol, dihydrocholesterol, (R)-(+)- and (S)-(−)-1-phenylethylamine, and (+)- and (−)- isopinocampheol were synthesized and characterized for the investigations of thermotropic and optical properties. Although helical sense does not appear to correlate with the sign of [α]D of the precursor chiral compound as suggested by the observations of cholesteryl and dihydrocholesteryl copolymers, the inversion of chirality in the pendant group, (R)-(+)- vs (S)-(−)-1-phenylethylamine, does lead to the opposite handedness in the resultant helical structure. To better understand the structure-property relationships involving helical sense and twisting power, systematic studies of the roles played by both nematogenic and chiral structures as well as other structural features of the comonomers should be conducted.

scholarly journals Синтез, структура и люминесцентные свойства нового двойного бората K3Eu3B4O12

2020 ◽  
Vol 22 (2) ◽  
pp. 219-224
Author(s):  
Евгений Викторович Ковтунец ◽  
Алексей Карпович Субанаков ◽  
Баир Гармаевич Базаров
Keyword(s):  
Rare Earth ◽  
Optical Materials ◽  
Materials Science ◽  
Second Harmonic ◽  
Spectroscopic Properties ◽  
Chemical Society ◽  
Materials Chemistry ◽  
Analysis Software ◽  
Host Matrix ◽  
Red Phosphor

Установлено образование нового двойного бората K3Eu3B4O12. По данным уточнения кристаллической структуры методом Ритвельда соединение, кристаллизуется в моноклинной сингонии с параметрами элементарной ячейки a = 10.6727(7) Å, b = 8.9086(6) Å, c = 13.9684(9) Å, b = 110.388(2) ° (пр. гр. P2/c). Структура K3Eu3B4O12 представляет собой ажурные слои [Eu8(BO3)8]∞, расположенные почти параллельно плоскости ab, образованные пятиугольными бипирамидами EuO7, октаэдрами EuO6 и присоединенными к ним через общие вершины треугольниками BO3. Связьмежду соседними слоями осуществляется посредством пятиугольных бипирамид EuO7, треугольников BO3 и катионов калия. В спектре люминесценции наблюдается доминирование заметной полосы на длине волны 611 нм, обусловленной переходом 5D0→7F2 иона Eu3+.       ЛИТЕРАТУРА 1. Xie Z., Mutailipu M., He G., Han G., Wang Y., Yang Z., Zhang M., Pan S. A series of rare-earth boratesK7MRE2B15O30 (M = Zn, Cd, Pb; RE = Sc, Y, Gd, Lu) with large second harmonic generation responses. Chemistry of Materials. 2018;30 (7): 2414–2423. DOI: https://doi.org/10.1021/acs.chemmater.8b004912. Mutailipu M., Xie Z., Su X., Zhang M., Wang Y., Yang Z., Janjua M. R. S. A., Pan S. Chemical cosubstitution-oriented design of rare-earth borates as potential ultraviolet nonlinear optical materials. Journal of theAmerican Chemical Society. 2017;139(50): 18397–18405. DOI: https://doi.org/10.1021/jacs.7b112633. Atuchin V. V., Subanakov A. K., Aleksandrovsky A. S., Bazarov B. G., Bazarova J. G., DorzhievaS. G., Gavrilova T. A., Krylov A. S., Molokeev M. S., Oreshonkov A. S., Pugachev A. M., Tushinova Yu. L.,Yelisseyev A. P. Exploration of structural, thermal, vibrational and spectroscopic properties of new noncentrosymmetric double borate Rb3NdB6O12. Advanced Powder Technology. 2017;28(5): 1309–1315. DOI:https://doi.org/10.1016/j.apt.2017.02.0194. Atuchin V. V., Subanakov A. K., Aleksandrovsky A. S., Bazarov B. G., Bazarova J. G., GavrilovaT. A., Krylov A. S., Molokeev M. S., Oreshonkov A. S., Stefanovich S. Yu. Structural and spectroscopic propertiesof new noncentrosymmetric selfactivated borate Rb3EuB6O12 with B5O10 units. Materials & Design.2018;140: 488–494. DOI: https://doi.org/10.1016/j.matdes.2017.12.0045. Subanakov A. K., Kovtunets E. V., Bazarov B. G., Dorzhieva S. G., Bazarova J. G. New double holmiumborates: Rb3HoB6O12 and Rb3Ho2B3O9. Solid State Sciences. 2020;105: 106231. DOI: https://doi.org/10.1016/j.solidstatesciences.2020.1062316. Zhao J., Zhao D., Liu B.-Z., Xue Y.-L., Fan Y.-P., Zhang S.-R., Zong Q. K3Gd3B4O12: a new member ofrare-earth orthoborate for luminescent host matrix. Journal of Materials Science: Materials in Electronics.2018;29(24): 20808–20819. DOI: https://doi.org/10.1007/s10854-018-0223-67. Bruker AXS TOPAS V4: General profi le and structure analysis software for powder diffraction data. User’sManual. Bruker AXS, Karlsruhe, Germany, 2008. 68 p. 8. Järvinen M. Application of symmetrized harmonics expansion to correction of the preferred orientationeffect. Journal of Applied Crystallography. 1993;26(4): 525–531. DOI: https://doi.org/10.1107/S00218898930012199. Tanner P. A. Some misconceptions concerning the electronic spectra of tri-positive europium andcerium. Chemical Society Reviews. 2013;12: 5090 DOI: https://doi.org/10.1039/c3cs60033e10. Zhao D., Ma F.-X., Wu Z.-Q., Zhang L., Wei W., Yang J., Zhang R.-H., Chen P.-F., Wu S.-X. Synthesis,crystal structure and characterizations of a new red phosphor K3EuB6O12. Materials Chemistry and Physics.2016;182: 231–236. DOI: https://doi.org/10.1016/j.matchemphys.2016.07.027

scholarly journals Macroscopic chiral symmetry breaking in monolayers of achiral nonconvex platelets

Soft Matter ◽  
2017 ◽  
Vol 13 (45) ◽  
pp. 8618-8624 ◽  
Author(s):  
Nikoletta Pakalidou ◽  
David L. Cheung ◽  
Andrew J. Masters ◽  
Carlos Avendaño
Keyword(s):  
Symmetry Breaking ◽  
Chiral Symmetry ◽  
Materials Science ◽  
Fundamental Problem ◽  
Chiral Symmetry Breaking ◽  
Building Blocks ◽  
Chiral Structures

The fabrication of chiral structures using achiral building blocks is a fundamental problem that remains a challenge in materials science. Pictured are local chiral configurations formed by non-convex (achiral) platelets with 6- and 4-fold symmetries.

scholarly journals Directed self-assembly of soft 3D photonic crystals for holograms with omnidirectional circular-polarization selectivity

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
SeongYong Cho ◽  
Misaki Takahashi ◽  
Jun-ichi Fukuda ◽  
Hiroyuki Yoshida ◽  
Masanori Ozaki
Keyword(s):  
Photonic Crystals ◽  
Circular Polarization ◽  
Self Assembly ◽  
Optical Materials ◽  
Soft Matter ◽  
Surface Anchoring ◽  
Chiral Nematic ◽  
Chiral Structures ◽  
Blue Phase ◽  
Blue Phases

AbstractControlling the crystallographic orientation of 3D photonic crystals is important as it determines the behavior of light propagating through the device. Blue phases self-assemble into unique soft 3D photonic crystals with chiral structures for circular-polarization selectivity, but it has remained a challenge to control its 3D orientation. Here, we show that the orientation of blue phases can be precisely controlled to follow a predefined pattern imprinted on a substrate by exploiting field-induced phase transitions. Obtaining the blue phase through the field-induced chiral nematic phase and tetragonal blue phase X results in a highly oriented blue phase I with the crystallographic [001] direction aligned along the surface anchoring. Our approach is applied to fabricating a Bragg-Berry hologram with omnidirectional circular-polarization selectivity, where the hologram is visible only for one circular-polarization under all incident angles. Such devices are difficult to fabricate using conventional optical materials, thereby demonstrating the potential of self-organizing soft matter for photonics.

scholarly journals Spiral Field Generation in Smith-Purcell Radiation by Helical Metagratings

Research ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Liqiao Jing ◽  
Zuojia Wang ◽  
Xiao Lin ◽  
Bin Zheng ◽  
Su Xu ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Free Electron ◽  
Phase Distribution ◽  
Helical Structure ◽  
Potential Candidate ◽  
Free Electron Lasers ◽  
Particle Detection ◽  
Field Patterns ◽  
Chiral Structures ◽  
Microwave Regime

Moving electrons interacting with media can give rise to electromagnetic radiations and has been emerged as a promising platform for particle detection, spectroscopies, and free-electron lasers. In this letter, we investigate the Smith-Purcell radiation from helical metagratings, chiral structures similar to deoxyribonucleic acid (DNA), in order to understand the interplay between electrons, photons, and object chirality. Spiral field patterns can be generated while introducing a gradient azimuthal phase distribution to the induced electric dipole array at the cylindrical interface. Experimental measurements show efficient control over angular momentum of the radiated field at microwave regime, utilizing a phased electromagnetic dipole array to mimic moving charged particles. The angular momentum of the radiated wave is determined solely by the handedness of the helical structure, and it thus serves as a potential candidate for the detection of chiral objects. Our findings not only pave a way for design of orbital angular momentum free-electron lasers but also provide a platform to study the interplay between swift electrons with chiral objects.

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