Bibliographies thématiques / Achiral and chiral

Littérature scientifique sur le sujet « Achiral and chiral »

Auteur : Grafiati
Publié le 18 mai 2024

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Articles de revues sur le sujet "Achiral and chiral"

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Rananaware, Anushri, Duong Duc La, Mohammad Al Kobaisi, Rajesh S. Bhosale, Sidhanath V. Bhosale et Sheshanath V. Bhosale. « Controlled chiral supramolecular assemblies of water soluble achiral porphyrins induced by chiral counterions ». Chemical Communications 52, no 67 (2016) : 10253–56. http://dx.doi.org/10.1039/c6cc04427a.

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Guven, Zekiye P., Burcin Ustbas, Kellen M. Harkness, Hikmet Coskun, Chakra P. Joshi, Tabot M. D. Besong, Francesco Stellacci, Osman M. Bakr et Ozge Akbulut. « Synthesis and characterization of mixed ligand chiral nanoclusters ». Dalton Transactions 45, no 28 (2016) : 11297–300. http://dx.doi.org/10.1039/c6dt00785f.

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Chiral mixed ligand silver nanoclusters were synthesized in the presence of a chiral and an achiral ligand. While the chiral ligand led mostly to the formation of nanoparticles, the presence of the achiral ligand drastically increased the yield of nanoclusters with enhanced chiral properties.
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Reyes Calle, Juliana, Jairo Antonio Cubillos Lobo, Consuelo Montes de Correa et Aída Luz Villa Holguín de P. « Oxidising agent and catalyst chirality effect on epoxidation of R-(+)- Limonene using Jacobsen-type catalysts ». Ingeniería e Investigación 28, no 2 (1 mai 2008) : 37–44. http://dx.doi.org/10.15446/ing.investig.v28n2.14890.

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The oxidising agent effect on R-(+)-Limonene epoxide diastereoselectivity using chiral and achiral Jacobsen’s type catalysts is presented. The type of oxidising agent strongly influences diastereoselectivity. Moderate diastereomeric excesses were achieved in the presence of oxidising agents prepared in situ but in the absence of catalyst (23% for DMD and 29% for O2/pivalaldehyde). Similar diastereomeric excesses were obtained with both chiral and achiral catalyst when the oxidising agents were prepared in situ; 56% and 50% excesses were obtained when using DMD for the chiral and achiral catalyst (respectively) and 38% using O2/pivalaldehyde for both catalysts. Diastereomeric excesses were not observed in the absence of catalyst when using commercial oxidising agents; the chiral catalyst presented larger diastereomeric excesses than its achiral counterpart: 65% and 38% excess using NaOCl for the chiral and achiral catalyst, respectively, and 79% and 39% using m-CPBA for the chiral and achiral catalyst, respectively. This suggests that at least one oxidant species, different from the conventionally accepted (MnV(oxo)), might be involved in this catalytic process. A modification of the traditional catalytic cycle is proposed considering the type of oxidising agent. The catalyst’s chiral centre appears to govern asymmetric induction when commercial oxidising agents are used, whereas the R-(+)-Limonene chiral centre appears to govern asymmetric induction in the presence of in situ-prepared oxidising agents. On the other hand, the chemical stability of Jacobsen’s catalyst improved when in situ produced DMD was used as oxidising agent.
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Pakalidou, Nikoletta, David L. Cheung, Andrew J. Masters et Carlos Avendaño. « Macroscopic chiral symmetry breaking in monolayers of achiral nonconvex platelets ». Soft Matter 13, no 45 (2017) : 8618–24. http://dx.doi.org/10.1039/c7sm01840a.

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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.
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Wilson, Tyler M., Audra Davis, Reilly E. Sonstrom, Justin L. Neill, Emma A. Ziebarth, Ariel Poulson et Richard E. Carlson. « Essential Oil Composition and Enantioselective Profile of Agastache urticifolia (Lamiaceae) and Monardella odoratissima (Lamiaceae) from Utah ». Molecules 28, no 5 (28 février 2023) : 2249. http://dx.doi.org/10.3390/molecules28052249.

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Two species within the Lamiaceae (mint) family, Agastache urticifolia and Monardella odoratissima, are aromatic plants that are native to the Intermountain Region (USA). Essential oil produced through steam distillation was examined to establish the essential oil yield and both the achiral and chiral aromatic profiles of both plant species. The resulting essential oils were analyzed by GC/MS, GC/FID, and MRR (molecular rotational resonance). For A. urticifolia and M. odoratissima, achiral essential oil profiles were largely composed of limonene (71.0%, 27.7%), trans-β-ocimene (3.6%, 6.9%), and pulegone (15.9%, 4.3%), respectively. Between the two species, eight chiral pairs were analyzed and, interestingly, the dominant enantiomer (calculated as ee%) of limonene and pulegone switched between the two species. Where enantiopure standards were not commercially available, MRR was used as a reliable analytical technique for chiral analysis. This study verifies the achiral profile for A. urticifolia and, for the first time to the authors’ knowledge, establishes the achiral profile for M. odoratissima and chiral profile for both species. Additionally, this study confirms the utility and practicality of using MRR for determining chiral profiles in essential oils.
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Wang, Lewen, Tengfei He, Hailiang Liao, Yige Luo, Wen Ou, Yinye Yu, Wan Yue, Guankui Long, Xingzhan Wei et Yecheng Zhou. « A Theoretical Design of Chiral Molecules through Conformational Lock towards Circularly Polarized Luminescence ». Photonics 9, no 8 (29 juillet 2022) : 532. http://dx.doi.org/10.3390/photonics9080532.

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Circularly polarized (CP) light has shown great potential in quantum computing, optical communications, and three-dimensional displays. It is still a challenge to produce high-efficiency and high-purity CP light. Herein, we proposed a strategy to design chiral organic small molecules for CP light generation. These kinds of chiral molecules are formed by achiral light-emitting groups and achiral alkyl chains through conformational lock, which indicates that chirality can also be introduced into achiral light-emitting groups through rational molecular design. The chirality of these molecules can be further tuned by changing the length of the alkyl chains connecting the diketopyrrolopyrrole unit. The chiroptical properties of these molecules are confirmed by calculated electronic circular dichroism and chiral emission spectra, and further confirmed in experiments. The strategy developed in this work will greatly enlarge the candidate library of chiral luminescent materials.
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Dressel, Christian, Wolfgang Weissflog et Carsten Tschierske. « Spontaneous mirror symmetry breaking in a re-entrant isotropic liquid ». Chemical Communications 51, no 87 (2015) : 15850–53. http://dx.doi.org/10.1039/c5cc06843f.

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Becalski, Adam, William R. Cullen, Michael D. Fryzuk, Georg Herb, Brian R. James, James P. Kutney, Krystyna Piotrowska et Dianne Tapiolas. « The chemistry of thujone. XII. The synthesis of pyrethroid analogues via chiral cyclopropanation ». Canadian Journal of Chemistry 66, no 12 (1 décembre 1988) : 3108–15. http://dx.doi.org/10.1139/v88-479.

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An extensive study involving achiral and chiral cyclopropanation of various isoprenoid units derived from the monoterpene thujone is presented. Carbenoid intermediates generated from ethyl and L-menthyl diazoacetates and various achiral and chiral copper catalysts are employed to achieve the desired cyclopropanation reaction. It is shown that high levels of enantiomeric excess can be achieved, particularly when L-menthyl diazoacetate and a chiral catalyst are employed. The resultant products are then converted to pyrethroid-like analogues.
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Destoop, Iris, Andrea Minoia, Oleksandr Ivasenko, Aya Noguchi, Kazukuni Tahara, Yoshito Tobe, Roberto Lazzaroni et Steven De Feyter. « Transfer of chiral information from a chiral solvent to a two-dimensional network ». Faraday Discussions 204 (2017) : 215–31. http://dx.doi.org/10.1039/c7fd00103g.

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Chiral induction in self-assembled monolayers has garnered considerable attention in the recent past, not only due to its importance in chiral resolution and enantioselective heterogeneous catalysis but also because of its relevance to the origin of homochirality in life. Here, we demonstrate the emergence of homochirality in a supramolecular low-density network formed by achiral molecules at the interface of a chiral solvent and an atomically-flat achiral substrate. We focus on the impact of structure and functionality of the adsorbate and the chiral solvent on the chiral induction efficiency in self-assembled physisorbed monolayers, as revealed by scanning tunneling microscopy. Different induction mechanisms are proposed and evaluated, with the assistance of advanced molecular modeling simulations.
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Jin, Lei, Xiongyu Liang, Chengmao He, Tiejun Wang, Kun Liang et Li Yu. « Plasmon—Assisted Resonance Energy Transfer Involving Electric and Magnetic Coupling ». Electronics 13, no 8 (19 avril 2024) : 1566. http://dx.doi.org/10.3390/electronics13081566.

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We develop a quantum theory based on macroscopic quantum electrodynamics to research the resonance energy transfer (RET) between a chiral donor and acceptor. It differs from the previous Green function approach which needs specific boundary conditions to obtain an analytical solution for calculating the RET rate. Our theory can combine the finite-difference time-domain (FDTD) method, which gives a simple and efficient semi-analytical approach, to evaluate the chiral RET rate in an arbitrary plasmonic nanosystem. Applying our theory to the systems of chiral molecules 3-methylcyclopentanone (3MCP) near the achiral/chiral plasmonic nanostructures, the RET process, which is divided into nondiscriminatory and discriminatory parts, is investigated. We find that plasmon will enhance both nondiscriminatory and discriminatory rates compared to the absence of plasmonic nanostructure, but the plasmon supported by chiral nanostructure contributes more to the discriminatory rate. The ratio of discriminatory to nondiscriminatory rates in the system consisting of 3MCP and chiral plasmonic structure is five-fold compared to the system consisting of 3MCP and achiral plasmonic structure. The phenomena can be attributed to the chiral electric-magnetic coupling. Our findings are important in understanding the achiral and chiral electric-magnetic interaction and designing chiral light-harvesting and sensing devices.
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Thèses sur le sujet "Achiral and chiral"

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Saeed, Mansoor. « Novel achiral and chiral derivatising reagents for indirect chiral resolution ». Thesis, University of Sunderland, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260828.

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Carlsson, Björn. « From achiral to chiral analysis of citalopram ». Doctoral thesis, Linköpings universitet, Klinisk farmakologi, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5217.

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Within the field of depression the “monoamine hypothesis” has been the leading theory to explain the biological basis of depression. This theory proposes that the biological basis of depression is due to a deficiency in one or more of three key neurotransmitter systems, namely noradrenaline, dopamine and serotonin which are thought to mediate the therapeutic actions of virtually every known antidepressant agent. Citalopram is a selective serotonin-reuptake inhibitor (SSRI) used for the treatment of depression and anxiety disorders. Citalopram is a racemic compound, in other words composed of a 50:50 mixture of two enantiomers (S-(+)-citalopram and R-(-)-citalopram) and with one of the enantiomers (S-(+)-citalopram) accounting for the inhibitory effect. At the time of introduction of citalopram the physician needed a therapeutic drug monitoring service to identify patients with interactions, compliance problems and for handling questions concerning polymorphic enzymes and drug metabolism. An achiral analytical separation method based on solid-phase extraction followed by high-performance liquid chromatography (HPLC) was developed for routine therapeutic drug monitoring (TDM) of citalopram and its two main demethylated metabolites. As the data available on citalopram were from achiral concentration determinations and to be able to further investigate citalopram enantiomers effects and distribution, a chiral method for separation of the enantiomers of citalopram and its demethylated metabolites was established. The advances within chiral separation techniques have made measurement of the concentrations of the individual enantiomers in biological fluids possible. The process behind enantioselective separation is however not fully understood and the mechanism behind the separation can be further scrutinized by the use of multivariate methods. A study of the optimization and characterization of the separation of the enantiomers of citalopram, desmethylcitalopram and didesmethylcitalopram on an acetylated ß-cyclodextrin column, by use of two different chemometric programs - response surface modelling and sequential optimization was performed. Sequential optimization can be a quicker mean of optimizing a chromatographic separation; response surface modelling, in addition to enabling optimization of the chromatographic process, also serves as a tool for learning more about the separation mechanism. Studies of the antidepressant effect and pharmacokinetics of citalopram have been performed in adults, but the effects on children and adolescents have only been studied to a minor extent, despite the increasing use of citalopram in these age groups. A study was initiated to investigate adolescents treated for depression, with respect to the steady-state plasma concentrations of the enantiomers of citalopram and its demethylated metabolites. The ratios between the S- and R-enantiomers of citalopram and didesmethylcitalopram were in agreement with studies involving older patients. The concentrations of the S-(+)- and R-(-) enantiomers of citalopram and desmethylcitalopram were also in agreement with values from earlier studies. The results indicate that the use of oral contraceptives may have some influence on the metabolism of citalopram. This might be because of an interaction of the contraceptive hormones with the polymorphic CYP2C19 enzyme. Even though the SSRIs are considered less toxic compared with older monoamine-active drugs like the tricyclic/tetracyclic antidepressants, the risk of developing serious side effects such as ECG abnormalities and convulsions has been seen for citalopram, when larger doses have been ingested. Furthermore, fatal overdoses have been reported where citalopram alone was the cause of death. Data on the toxicity of each of the enantiomers in humans have not been reported and no data on blood levels of the enantiomers in cases of intoxication have been presented. An investigation was initiated on forensic autopsy cases where citalopram had been found at the routine screening and these cases were further analysed with enantioselective analysis to determine the blood concentrations of the enantiomers of citalopram and metabolites. Furthermore the genotyping regarding the polymorphic enzymes CYP2D6 and CYP2C19 were performed. In 53 autopsy cases, we found increasing S/R ratios with increasing concentrations of citalopram. We found also that high citalopram S/R ratio were associated with high parent drug to metabolite ratio and may be an indicator of recent intake. Only 3.8 % were found to be poor metabolizers regarding CYP2D6 and for CYP2C19 no poor metabolizer was found. Enantioselective analysis of citalopram and its metabolites can provide valuable information about the time that has elapsed between intake and death. Genotyping can be of help in specific cases but the possibility of pharmacokinetic interactions is apparently a far greater problem than genetic enzyme deficiency.
On the day of the public defence the status of article IV was: Submitted.
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Carlsson, Björn. « From achiral to chiral analysis of citalopram / ». Linköping : Univ, 2003. http://www.ep.liu.se/diss/med/07/93/index.html.

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Gutierrez, Cuevas Karla Guadalupe Gutierrez. « LIQUID CRYSTALLINE NANOCOMPOSITES : FROM ACHIRAL TO CHIRAL SYSTEMS ». Kent State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=kent1500998489695319.

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Haldar, Sripada. « Investigation on some achiral and chiral mesogemic systems by different experimental techniques ». Thesis, University of North Bengal, 2013. http://hdl.handle.net/123456789/1481.

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Carter-Finch, Annabelle Suzanne. « The investigation of achiral and chiral separations by capillary electrochromatography ». Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327053.

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Horcajada, Roberto. « Radical-anions of chiral and achiral 1,6-diaminophenazine derivatives as electrogenerated bases ». Thesis, Queen Mary, University of London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401860.

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Fergusson, Kenneth Matthew. « The synthesis and properties of achiral and chiral bent-core liquid crystals ». Thesis, University of Hull, 2008. http://hydra.hull.ac.uk/resources/hull:5810.

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The area of liquid crystals has received substantial research effort over the last century, particularly when the beneficial applications such as Liquid Crystal Displays (LCDs) were realised and developed. For the majority of this time, it has been considered that a linear molecular shape is required in order to generate a mesomorphic phase. It was therefore of particular interest and excitement when, in 1996, it was shown that a 'banana-shaped' molecular architecture could exhibit a new class of liquid crystalline phase. Additionally it was found that these new mesophases exhibited chiral domains, leading to electrooptical switching properties, despite the constituent molecules being achiral. Unsurprisingly, these observations have led to a vast frontier of research in the area of 'banana-shaped' and 'bentcore' systems over the past decade and many interesting properties relating to such systems have been reported. The work contained within this thesis investigates two areas of bent-core liquid crystals. Firstly, the introduction of fluoro-substituents to the bent-core of an achiral banana-shaped system has been assessed, in terms of both position, and number of substituents. The resultant mesomorphic properties of these compounds have shown that there is a very delicate boundary between banana, and 'conventional' mesomorphism, relating to subtle changes in molecular structure. Appropriately positioned fluoro-substituents upon the bent-core generate a more linear conformation, facilitating the generation of nematic phases. Possible reasoning for this observation has been discussed. Secondly, the effect of introducing a bent-core to a conventional calamitic structure, and the addition of fluoro-substituents, has been examined. Whilst a variation of this nature to the majority of calamitic molecular structures would have a severely detrimental effect upon the resultant mesophase morphology, it has been shown that this is not always the case and indeed the addition of fluoro-substituents is shown to enhance the mesomorphic stability of the smectic A phase.
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Morrison, Calum M. « Chiral and achiral analysis of benzodiazepine and anti-anginal drugs in forensic toxicology ». Thesis, University of Glasgow, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321443.

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Kiakos, K. « Molecular and cellular pharmacology of novel chiral and achiral CC-1065/duocarmycin analogues ». Thesis, University College London (University of London), 2007. http://discovery.ucl.ac.uk/1444902/.

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CC-1065 and the duocarmycins are highly potent anticancer agents, exerting their biological activity through covalently reacting with adenine-N3 in the minor groove of AT-rich sequences. The alkylation properties and cytotoxicity of a series of novel chiral analogues are reported in this thesis. Structural modifications of established pharmacophores resulting in novel alkylating functionalities as well as variations of the DNA binding domain were introduced in the analogues considered, The sequence specificity of these compounds was assessed by a Taq Polymerase stop assay, identifying the sites of covalent modification on plasmid DNA and the purine-N3 adducts probed by a thermally-induced strand cleavage assay. The cytotoxic potency of the analogues was determined against human, chronic myeloid leukemia, K562, cells, using a MTT based growth inhibition assay. The importance of the chiral centre present in the natural products was subsequently investigated with a series of achiral analogues. The studies established that the chiral centre is not absolutely required for DNA interaction and cytotoxicity. This finding offers the possibility of a new platform for the design of novel, active CC-1065/duocarmycin analogues. A key chiral and an achiral analogue were selected for DNA repair studies. The sensitivity of yeast mutants deficient in specific DNA repair pathways was assessed in order to delineate the mechanisms involved in the repair of the relevant adenine-N3 adducts. Nucleotide excision repair (NER) and post replication repair mutants were the most sensitive to the two analogues. Single-strand ligation PCR was employed to follow the induction and repair of the lesions at nucleotide resolution. Adduct elimination of both agents was by transcription-coupled NER, and dependent upon functional Radl8. Finally, the involvement of NER as the predominant excision pathway was further confirmed in mammalian DNA repair mutant cells.
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Livres sur le sujet "Achiral and chiral"

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Hurni, Christian. Chiara und Achill : Sie Verändern Die Welt. Independently Published, 2021.

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Chapitres de livres sur le sujet "Achiral and chiral"

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Schäferling, Martin. « Chiral Fields of Macroscopically Achiral Arrangements ». Dans Springer Series in Optical Sciences, 87–100. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-42264-0_6.

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Fujita, Shinsaku. « Compounds with Achiral and Chiral Ligands ». Dans Symmetry and Combinatorial Enumeration in Chemistry, 255–70. Berlin, Heidelberg : Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-76696-1_19.

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Sachs, Johannes. « Chiroptical Spectroscopy of Single Chiral and Achiral Nanoparticles ». Dans Motion, Symmetry & ; Spectroscopy of Chiral Nanostructures, 61–95. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-88689-9_4.

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Sachs, Johannes. « Motion of Chiral and Achiral Structures at Low Re ». Dans Motion, Symmetry & ; Spectroscopy of Chiral Nanostructures, 27–59. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-88689-9_3.

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Harary, Frank, et Paul G. Mezey. « Chiral and achiral square-cell configurations ; the degree of chirality ». Dans New Developments in Molecular Chirality, 241–56. Dordrecht : Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3698-3_8.

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Wang, Yun-Che, Tse-Chun Liao, Kai-Wen Tan et Sergey M. Aizikovich. « Bandgap Properties of a Class of Chiral and Achiral Metamaterials ». Dans Advanced Structured Materials, 717–26. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-26186-2_44.

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Athanasiadis, Christodoulos, Evangelia Athanasiadou, Sotiria Dimitroula et Eleftheria Kikeri. « Scattering Relations for a Multi-Layered Chiral Scatterer in an Achiral Environment ». Dans Applications of Mathematics and Informatics in Science and Engineering, 27–41. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04720-1_2.

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Dahlenburg, Lutz. « Cleavage of the Carbon-Hydrogen Bond on Achiral and Chiral Transition Metal Complexes ». Dans Organic Synthesis via Organometallics (OSM 4), 41–57. Wiesbaden : Vieweg+Teubner Verlag, 1993. http://dx.doi.org/10.1007/978-3-322-84062-2_4.

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Dyas, A. M., M. L. Robinson et A. F. Fell. « The Design of Chiral Separations for β-Blocker Drugs on Pirkle High-Performance Liquid Chromatography Phases Using Achiral Derivatisation ». Dans Recent Advances in Chiral Separations, 31–37. New York, NY : Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-8282-9_5.

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Feis, Joshua, Dominik Beutel, Julian Köpfler, Xavier Garcia-Santiago, Carsten Rockstuhl, Martin Wegener et Ivan Fernandez-Corbaton. « An Achiral Optical Cavity with Helicity-Preserving Modes for Enhanced Sensing of Chiral Molecules ». Dans NATO Science for Peace and Security Series B : Physics and Biophysics, 317–19. Dordrecht : Springer Netherlands, 2021. http://dx.doi.org/10.1007/978-94-024-2138-5_34.

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Actes de conférences sur le sujet "Achiral and chiral"

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Wang, Jincheng, et Chunlei Guo. « Turning Optically Achiral Materials Chiral ». Dans 2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference. IEEE, 2007. http://dx.doi.org/10.1109/cleoe-iqec.2007.4386304.

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Buaossa, Nagi A., Monish R. Chatterjee, Elforjani Jera et Rajab Ataai. « Examination of Chiral Magnetic Slab and Spectral Response ». Dans Frontiers in Optics. Washington, D.C. : Optica Publishing Group, 2023. http://dx.doi.org/10.1364/fio.2023.fd2.6.

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The results obtained for Fresnel coefficients (FCs) corresponding to a magnetic achiral/chiral (ACC) and chiral/achiral (CAC) interfaces are extended to examine the chiral magnetic slab and spectral response.
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Rodrigues, Sean P., Yonghao Cui, Shoufeng Lan, Lei Kang et Wenshan Cai. « Achiral Nanoprobes Extract Chiral Signals from within Chiral Metamaterials ». Dans CLEO : QELS_Fundamental Science. Washington, D.C. : OSA, 2016. http://dx.doi.org/10.1364/cleo_qels.2016.fth3d.2.

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Ataai, Rajab Y., et Monish R. Chatterjee. « Planar Electromagnetic Propagation of a Circularly Polarized Wave Across Achiral/Chiral and Chiral/Achiral Interfaces using Fresnel Coefficients ». Dans NAECON 2019 - IEEE National Aerospace and Electronics Conference. IEEE, 2019. http://dx.doi.org/10.1109/naecon46414.2019.9058013.

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Mayer, Nicola, David Ayuso, Misha Ivanov et Olga Smirnova. « Control of achiral and chiral media with synthetic chiral vortex beams ». Dans International Conference on Ultrafast Phenomena. Washington, D.C. : Optica Publishing Group, 2022. http://dx.doi.org/10.1364/up.2022.w4a.26.

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We combine bicircular vortex beams to create chiral vortices with azimuthally varying handedness. The vortex can imprint its local chirality on atoms and transfer its global topology on the dipole response from chiral molecules.
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Buaossa, Nagi A., et Monish R. Chatterjee. « Comparative Study of Planar Electromagnetic Wave Propagation across Dual-Interface and Stand-Alone Magnetic Chiral/Achiral (CAC) Interfaces ». Dans Frontiers in Optics. Washington, D.C. : Optica Publishing Group, 2022. http://dx.doi.org/10.1364/fio.2022.jw5b.14.

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The results obtained for Fresnel amplitude coefficients (FCs) corresponding to a magnetic achiral/chiral (ACC) interface under variable incident angles and permittivity/permeability ratios, is extended to comparative study between two methods (incidence conditions) for investigating propagation of plane waves with left- and right- circular polarization (LCP & RCP) incident upon a chiral/achiral (CAC) interface.
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Fukui, Yamato, Atsushi Taguchi et Keiji Sasaki. « Quest for chiral nanogap structures using topology optimization ». Dans Conference on Lasers and Electro-Optics/Pacific Rim. Washington, D.C. : Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleopr.2022.p_ctu8_14.

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Nanogap structures, widely used in the field of nanophotonics, are usually achiral, which have mirror image symmetry. We designed chiral nano-gap structures having selectivity against the handedness of circularly polarized light.
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Okamoto, Hiromi, Shun Hashiyada, Yoshio Nishiyama et Tetsuya Narushima. « Imaging Chiral Plasmons ». Dans JSAP-OSA Joint Symposia. Washington, D.C. : Optica Publishing Group, 2017. http://dx.doi.org/10.1364/jsap.2017.5a_a410_1.

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Chirality is a broad concept that characterizes structures of systems in almost all hierarchy of materials in natural sciences. Molecular chirality is sometimes essential in biological functions. Also in nanomaterials sciences, chirality plays a key role. It is of fundamental importance to investigate internal structures (geometrical distributions) of chiral optical responses in nanomaterials, to design chiral features of the materials and their functions. We developed near-field optical activity (typically circular dichroism, CD) imaging systems that allow us to visualize local structures of optical activity in nanomaterials, and observed near-field CD images of two-dimensional gold nanostructures fabricated with electron beam lithography lift-off technique. We found that the amplitudes of local CD signals were as large as 100 times the macroscopic CD signals of the same samples, for two-dimensional chiral gold nanostructures [1]. Even highly symmetric achiral structures that never give CD signals macroscopically gave locally very strong CD signals (a typical example for a rectangular nanostructure is shown in Figure 1) [2,3]. In this case, average of the signal over the nanostructure yielded roughly null CD intensity. While achiral nanostructures show in general local CD activities as mentioned above, circularly symmetric (two-dimensionally isotropic) nanostructures, such as circular disks, never give CD signals at any local positions. However, when the circular disk is illuminated with linearly polarized light, the circular symmetry is broken, and thus the system potentially yields locally chiral optical (i.e., circularly polarized) fields. To demonstrate that, we extended the near-field CD microscope, and enabled irradiation of well- defined linearly polarized near-field on the sample and detection of scattered-field ellipticity and polarization azimuth angle. We found for circular gold disks that the scattered field was actually elliptically polarized. The ellipticity and the azimuth angle of the scattered field depended on the incident polarization angle and relative position on the disk.
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Varadan, Vasundara V., R. T. Apparao et Vijay K. Varadan. « Long-wavelength models for effectively chiral and achiral microwave composites containing chiral inclusions ». Dans 1994 North American Conference on Smart Structures and Materials, sous la direction de H. Thomas Banks. SPIE, 1994. http://dx.doi.org/10.1117/12.174236.

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Rocha-Mendoza, I., D. R. Yankelevich, M. Wang, C. Bratton, K. M. Reiser, C. W. Frank et A. Knoesen. « Achiral and chiral sum frequency vibrational spectroscopy of collagen fibrils ». Dans 2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference. IEEE, 2006. http://dx.doi.org/10.1109/cleo.2006.4628644.

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Rapports d'organisations sur le sujet "Achiral and chiral"

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Brown, Herbert C., Ashok M. Salunkhe et Ankush B. Argade. Organoboranes. 55. An Improved Procedure for the Conversion of Representative Achiral and Chiral Monoalkyl-, (E)- and (Z)-Alkenyl-, and Arylboronates into the Corresponding Organldichloroboranes. Fort Belvoir, VA : Defense Technical Information Center, juin 1992. http://dx.doi.org/10.21236/ada251643.

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