Готові списки джерел за темами / Chiroptical Response

Добірка наукової літератури з теми "Chiroptical Response"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Chiroptical Response"

1

Davis, Matthew S., Wenqi Zhu, Jay K. Lee, Henri J. Lezec, and Amit Agrawal. "Microscopic origin of the chiroptical response of optical media." Science Advances 5, no. 10 (October 2019): eaav8262. http://dx.doi.org/10.1126/sciadv.aav8262.

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Анотація:
The potential for enhancing the optical activity of natural chiral media using engineered nanophotonic components has been central in the quest toward developing next-generation circular-dichroism spectroscopic techniques. Through confinement and manipulation of optical fields at the nanoscale, ultrathin optical elements have enabled a path toward achieving order-of-magnitude enhancements in the chiroptical response. Here, we develop a model framework to describe the underlying physics governing the origin of the chiroptical response in optical media. The model identifies optical activity to originate from electromagnetic coupling to the hybridized eigenstates of a coupled electron-oscillator system, whereas differential absorption of opposite handedness light, though resulting in a far-field chiroptical response, is shown to have incorrectly been identified as optical activity. We validate the model predictions using experimental measurements and show them to also be consistent with observations in the literature. The work provides a generalized framework for the design and study of chiroptical systems.
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2

Ozcelik, Ani, Raquel Pereira-Cameselle, and José Lorenzo Alonso-Gómez. "From Allenes to Spirobifluorenes: On the Way to Device-compatible Chiroptical Systems." Current Organic Chemistry 24, no. 23 (December 28, 2020): 2737–54. http://dx.doi.org/10.2174/1385272824999201013164534.

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Анотація:
The last decade has seen a huge growth in the construction of chiral systems to expand the scope of chiroptical applications. Dependence of chiroptical response on molecular conformation typically leads to low chiroptical intensities of chiral systems that feature several conformations in solution. In this respect, allenes were employed for the preparation of open and cyclic oligomers as well as molecular cages, presenting remarkable chiroptical responses in solution. Their molecular chirality was also transferred to metal surfaces, yet photoisomerization of allenes limited their further exploration. In search of a more robust chiral axis, theoretical and experimental studies confirmed that spirobifluorenes could give rise to stable systems with tailored optical and chiroptical properties. Additionally, incorporating a conformational lock into spirobifluorene cyclic architectures served as an efficient strategy towards the generation of distinct helical molecular orbitals. This review article outlines our results on developing device-compatible chiroptical systems through axially chiral allenes and spirobifluorenes. The contribution from other research groups is presented briefly.
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3

Kim, Joohoon, Ahsan Sarwar Rana, Yeseul Kim, Inki Kim, Trevon Badloe, Muhammad Zubair, Muhammad Qasim Mehmood, and Junsuk Rho. "Chiroptical Metasurfaces: Principles, Classification, and Applications." Sensors 21, no. 13 (June 26, 2021): 4381. http://dx.doi.org/10.3390/s21134381.

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Анотація:
Chiral materials, which show different optical behaviors when illuminated by left or right circularly polarized light due to broken mirror symmetry, have greatly impacted the field of optical sensing over the past decade. To improve the sensitivity of chiral sensing platforms, enhancing the chiroptical response is necessary. Metasurfaces, which are two-dimensional metamaterials consisting of periodic subwavelength artificial structures, have recently attracted significant attention because of their ability to enhance the chiroptical response by manipulating amplitude, phase, and polarization of electromagnetic fields. Here, we reviewed the fundamentals of chiroptical metasurfaces as well as categorized types of chiroptical metasurfaces by their intrinsic or extrinsic chirality. Finally, we introduced applications of chiral metasurfaces such as multiplexing metaholograms, metalenses, and sensors.
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4

Fronk, Stephanie L., Ming Wang, Michael Ford, Jessica Coughlin, Cheng-Kang Mai, and Guillermo C. Bazan. "Effect of chiral 2-ethylhexyl side chains on chiroptical properties of the narrow bandgap conjugated polymers PCPDTBT and PCDTPT." Chemical Science 7, no. 8 (2016): 5313–21. http://dx.doi.org/10.1039/c6sc00908e.

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Анотація:
PCPDTBT* and PCDTPT* containing chiral 2-ethylhexyl side chains were synthesized and their resulting chiroptical properties were studied. PCPDTBT* exhibits a stronger chiroptical response compared to PCDTPT*.
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5

Woźniak, Paweł, Israel De Leon, Katja Höflich, Caspar Haverkamp, Silke Christiansen, Gerd Leuchs, and Peter Banzer. "Chiroptical response of a single plasmonic nanohelix." Optics Express 26, no. 15 (July 16, 2018): 19275. http://dx.doi.org/10.1364/oe.26.019275.

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6

Opačak, Saša, Darko Babić, Berislav Perić, Željko Marinić, Vilko Smrečki, Barbara Pem, Ivana Vinković Vrček, and Srećko I. Kirin. "A ferrocene-based pseudopeptide chiroptical switch." Dalton Transactions 50, no. 13 (2021): 4504–11. http://dx.doi.org/10.1039/d1dt00508a.

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Ji, Hai-Feng. "A general method to predict optical rotations of chiral molecules from their structures." RSC Advances 13, no. 7 (2023): 4775–80. http://dx.doi.org/10.1039/d2ra08290j.

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He, Yizhuo, Keelan Lawrence, Whitney Ingram, and Yiping Zhao. "Strong Local Chiroptical Response in Racemic Patchy Silver Films: Enabling a Large-Area Chiroptical Device." ACS Photonics 2, no. 9 (August 28, 2015): 1246–52. http://dx.doi.org/10.1021/acsphotonics.5b00196.

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Ie, Machiko, Jun-ichiro Setsune, Kazuo Eda, and Akihiko Tsuda. "Chiroptical sensing of oligonucleotides with a cyclic octapyrrole." Organic Chemistry Frontiers 2, no. 1 (2015): 29–33. http://dx.doi.org/10.1039/c4qo00268g.

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10

Malola, Sami, and Hannu Häkkinen. "Chiral footprint of the ligand layer in the all-alkynyl-protected gold nanocluster Au144(CCPhF)60." Chemical Communications 55, no. 64 (2019): 9460–62. http://dx.doi.org/10.1039/c9cc04914b.

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Дисертації з теми "Chiroptical Response"

1

McAlexander, Harley R. "Local Correlation Approaches and Coupled Cluster Linear Response Theory." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/52951.

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Quantum mechanical methods are becoming increasingly useful and applicable tools to complement and support experiment. Nonetheless, some barriers to further applications of theoretical models still remain. A coupled cluster singles and doubles (CCSD) calculation, a reliable textit{ab initio} method, scales approximately on the order of ${cal O}(N^6)$, where $N$ is a measure of the system size. This unfortunately limits the use of such high-accuracy methods to relatively small systems. Coupled cluster property calculations must be used in conjunction with reduced-scaling methods in order to broaden the range of applications to larger systems. In this work, we introduce some of the underlying theory behind such calculations and test the performance of several local correlation techniques for polarizabilities, optical rotations, and excited state properties. In general, when the computational cost is significantly reduced, the necessary accuracy is lost. Polarizabilities are less sensitive to the truncation schemes than optical rotations, and the excitation data is often only in agreement with the canonical result for the first few excited states. Additionally, we present a novel application of equation-of-motion coupled cluster singles and doubles to simulated circularly polarized luminescence spectra of eight chiral ketones. Both the absorption in the ground state and emission from the excited states were examined. Extensive geometry analyses were performed, revealing that optimized structures at the density functional theory were adequate for the calculation accurate coupled cluster excitation data.
Ph. D.
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2

Nair, Greshma. "Theoretical and Experimental Study of Three-Dimensional Chiro-Optical Materials." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/4072.

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Light-matter interactions at the nanoscale have been widely studied over the past few decades. In particular, the interaction of light with asymmetric nanostructures has harbored the interests of chemists, biologists and physicists alike. The world around us is largely constituted of asymmetric structures such as DNA, sugars, amino-acids, proteins, enzymes which form the backbone of every living matter. Structures which cannot be superimposed on their mirror images are termed as chiral structures. Naturally occurring chiral objects display unique optical properties such as Circular Dichroism (CD) and Optical Rotation, although these effects are typically very weak and occur in the UV. In recent years, researchers have focused in designing artificial chiral substrates with large chiral response in the visible, which are orders of magnitude stronger than the naturally chiral objects. These engineered systems are suitable for a wide range of applications such as broadband circular polarizers, chiral molecule detection and negative refractive index media. The design scheme for chiro-plasmonic systems relied on the assembling plasmonic achiral nanostructures in chiral geometries or fabricating plasmonic materials of chiral geometries. In the work presented in this thesis, we present a detailed theoretical and experimental investigation of plasmonic effects in different two and three dimensional chiral systems. One of the design schemes proposed in this work consists of vertical stacking of oppositely handed 2D chiral structures. Owing to the strong plasmon coupling between the individual nanostructures, there was a significant enhancement in the calculated CD values as opposed to the isolated planar components. Varying the separation and the relative orientation of the layers rendered the optical response tunable in the visible. The other strategy proposed here was placing an achiral plasmonic NP in chiral hotspot of the chiral plasmonic structures. The results from the numerical simulations suggest the interaction between a chiral and achiral NP at close proximity could be a way for enhancing the chiral response in the visible. This is to our knowledge, the first observation of a chiral-achiral metallic plasmonic interaction. Three dimensional chiral structures such as metallic helices or NPs around DNA helix were found to exhibit strong CD effects in the visible. A major focus of this thesis work was the development of wafer-scale, three dimensional metal-decorated helical substrates with one of the largest reported optical responses in the visible. Additionally we investigated theoretically and experimentally the effect of plasmon coupling between the metal helices on the resultant CD and asymmetry factor. The effect of inter-particle separation was found to have a near-exponential dependence on the magnitude of the CD response. On the other hand, changing the refractive index of the dielectric template altered the chiral responses drastically. Finally we investigated a novel geometry of chiral nanoshells consisting of a dielectric helical core with a conformal coating of a metallic shell. The spherical nanoshells have been extensively studied for its distinct plasmonic response and have been utilized for drug-delivery and optical sensing applications. Chiral nanoshells are fundamentally different because of the asymmetric nature of the nanoshell. Moreover the shell is made of alternate plasmonic material-Titanium Nitride which is optically similar to Gold but more robust and chemically stable in comparison. The resulting optical response of the chiral shell geometry was the broadest CD curve we observed until now, covering the whole of visible to near infra-red regime, implying this geometry to be a promising candidate for broadband circular polarizer applications. All the studies carried out in this thesis, gives us an outlook on the possible design scheme and the underlying physics that could help us in engineering the chiral response based on the desired operating range of wavelength.
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Частини книг з теми "Chiroptical Response"

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Daniel Crawford, T. "Frontiers of Coupled Cluster Chiroptical Response Theory." In Frontiers of Quantum Chemistry, 49–68. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-5651-2_3.

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2

Autschbach, Jochen, Lucia Nitsch-Velasquez, and Mark Rudolph. "Time-Dependent Density Functional Response Theory for Electronic Chiroptical Properties of Chiral Molecules." In Electronic and Magnetic Properties of Chiral Molecules and Supramolecular Architectures, 1–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/128_2010_72.

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3

Jaycox, Gary D. "Structured Polymers with Stimuli-Responsive Chiroptical Behavior: Azobenzene-Modified Helical Constructs." In ACS Symposium Series, 87–99. Washington, DC: American Chemical Society, 2002. http://dx.doi.org/10.1021/bk-2002-0812.ch007.

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Тези доповідей конференцій з теми "Chiroptical Response"

1

Shi, Jinhui, Rongyu Liu, Pengtao Lai, Zheng Zhu, Yuxiang Li, and Fatian Wang. "Srong chiroptical response in optical metamaterials." In Plasmonics III, edited by Satoshi Kawata, David J. Bergman, and Hongxing Xu. SPIE, 2018. http://dx.doi.org/10.1117/12.2502853.

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2

Vaccaro, Patrick H. "Intrinsic Chiroptical Response and Its Mediation by Extrinsic Perturbations." In Laser Science. Washington, D.C.: OSA, 2009. http://dx.doi.org/10.1364/ls.2009.lsmb3.

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3

Davis, Matthew S., Jay K. Lee, Henri J. Lezec, and Amit Agrawal. "Microscopic origin of the chiroptical response of plasmonic media." In CLEO: QELS_Fundamental Science. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/cleo_qels.2018.fth3m.6.

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4

Belardini, Alessandro, Ventsislav K. Valev, Concita Sibilia, Joel Collins, David C. Hooper, Emilija Petronijevic, Teemu Hakkarainen, et al. "Nonlinear Chiroptical Response of GaAs Nanowires Partially Covered by Au." In 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC). IEEE, 2019. http://dx.doi.org/10.1109/cleoe-eqec.2019.8873383.

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Li, Xiangping, and Zi-Lan Deng. "Planar metasurface enabled polarization optics and chiroptical response (Conference Presentation)." In Optoelectronic Devices and Integration XI, edited by Baojun Li, Changyuan Yu, Xuping Zhang, and Xinliang Zhang. SPIE, 2022. http://dx.doi.org/10.1117/12.2647650.

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6

Lemler, Paul, Patrick Vaccaro, and Clayton Craft. "NATURAL OPTICAL ACTIVITY OF CHIRAL EPOXIDES: THE INFLUENCE OF STRUCTURE AND ENVIRONMENT ON THE INTRINSIC CHIROPTICAL RESPONSE." In 72nd International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2017. http://dx.doi.org/10.15278/isms.2017.rg05.

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Kang, Lei, Sean P. Rodrigues, Mohammad Taghinejad, Shoufeng Lan, Kyu-Tae Lee, Taiwei Yue, Sawyer D. Campbell, et al. "A Chiral Meta-Mirror Enabled Linear and Nonlinear Chiroptical Responses." In 2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2018. http://dx.doi.org/10.1109/apusncursinrsm.2018.8609120.

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