Готові списки джерел за темами / Chiro-optical Response

Добірка наукової літератури з теми "Chiro-optical Response"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Chiro-optical Response"

1

Singh, Haobijam Johnson, and Ambarish Ghosh. "Chiro-optical response in helically arranged achiral dielectric nanoparticles." Journal of Materials Chemistry C 6, no. 10 (2018): 2430–34. http://dx.doi.org/10.1039/c8tc00085a.

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2

Petronijevic, Emilija, Zakaria El-ansary, Bilal Brioual, Alessandro Belardini, Hari Prasath Ram Kumar, Tiziana Cesca, Carlo Scian, Giovanni Mattei, and Concita Sibilia. "Experiments and simulations of chiro-optical response in lowcost nanohole arrays in silver." EPJ Web of Conferences 266 (2022): 09006. http://dx.doi.org/10.1051/epjconf/202226609006.

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Анотація:
2D metasurfaces based on periodic nanoholes in metal have been proposed in various plasmonic platforms. Specifically, their resonant features have led to applications spanning in biosensing. Here we investigate additional degree of freedom in elliptical nanohole arrays with hexagonal geometry: chiro-optical effects. Namely, the in-plane asymmetry and a slightly elliptical shape of nanoholes were previously shown to differently extinct light of opposite handedness, even at normal incidence. We now fully characterize nanoholes in Ag, fabricated by low-cost nanosphere lithography. We first measure the dependence of the transmitted intensity for opposite handedness, in a broad spectral and angle of incidence range. We then resolve the circular polarization degree of the transmitted light when the nanohole array is excited with linear polarization. Finally, we numerically investigate the origin of the chiro-optical effect at the nanoscale. We believe that circular polarization resolving of the transmitted degree could be further adapted as a highly sensitive tool in chiral sensing.
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3

Petronijevic, Emilija, Elizabeth Mendoza Sandoval, Mohammad Ramezani, César L. Ordóñez-Romero, Cecilia Noguez, Fabio Antonio Bovino, Concita Sibilia, and Giuseppe Pirruccio. "Extended Chiro-optical Near-Field Response of Achiral Plasmonic Lattices." Journal of Physical Chemistry C 123, no. 38 (September 4, 2019): 23620–27. http://dx.doi.org/10.1021/acs.jpcc.9b06556.

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4

Sarkar, Sumant, Ryan O. Behunin, and John G. Gibbs. "Shape-Dependent, Chiro-optical Response of UV-Active, Nanohelix Metamaterials." Nano Letters 19, no. 11 (September 26, 2019): 8089–96. http://dx.doi.org/10.1021/acs.nanolett.9b03274.

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5

Singh, Haobijam Johnson, and Ambarish Ghosh. "Large and Tunable Chiro-Optical Response with All Dielectric Helical Nanomaterials." ACS Photonics 5, no. 5 (March 26, 2018): 1977–85. http://dx.doi.org/10.1021/acsphotonics.7b01455.

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6

Toffoli, Daniele, Oscar Baseggio, Giovanna Fronzoni, Mauro Stener, Alessandro Fortunelli, and Luca Sementa. "Pd doping, conformational, and charge effects on the dichroic response of a monolayer protected Au38(SR)24 nanocluster." Physical Chemistry Chemical Physics 21, no. 7 (2019): 3585–96. http://dx.doi.org/10.1039/c8cp04107e.

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Анотація:
TDDFT simulations of the absorption and CD spectra of a Pd2Au36(SC2H4Ph)24 monolayer-protected cluster (MPC) are carried out with the aim of investigating the effects of doping, conformational degrees of freedom of the thiolates’ end-groups, and charge states on its chiro-optical response.
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7

Ninawe, Akanksha, Priyanka Suri, Zhuolin Xie, Xianfan Xu, and Ambarish Ghosh. "Chiro-optical response of a wafer scale metamaterial with ellipsoidal metal nanoparticles." Nanotechnology 32, no. 31 (May 10, 2021): 315705. http://dx.doi.org/10.1088/1361-6528/abf877.

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8

Wang, Feng, and Hayk Harutyunyan. "Observation of a Giant Nonlinear Chiro‐Optical Response in Planar Plasmonic–Photonic Metasurfaces." Advanced Optical Materials 7, no. 19 (June 27, 2019): 1900744. http://dx.doi.org/10.1002/adom.201900744.

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9

Padula, Daniele, Inmaculada R. Lahoz, Carlos Díaz, Florencio E. Hernández, Lorenzo Di Bari, Antonio Rizzo, Fabrizio Santoro, and M. Magdalena Cid. "A Combined Experimental-Computational Investigation to Uncover the Puzzling (Chiro-)optical Response of Pyridocyclophanes: One- and Two-Photon Spectra." Chemistry - A European Journal 21, no. 34 (July 14, 2015): 12136–47. http://dx.doi.org/10.1002/chem.201500557.

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10

Toffoli, Daniele, Marco Medves, Giovanna Fronzoni, Emanuele Coccia, Mauro Stener, Luca Sementa, and Alessandro Fortunelli. "Plasmonic Circular Dichroism in Chiral Gold Nanowire Dimers." Molecules 27, no. 1 (December 24, 2021): 93. http://dx.doi.org/10.3390/molecules27010093.

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Анотація:
We report a computational study at the time-dependent density functional theory (TDDFT) level of the chiro-optical spectra of chiral gold nanowires coupled in dimers. Our goal is to explore whether it is possible to overcome destructive interference in single nanowires that damp chiral response in these systems and to achieve intense plasmonic circular dichroism (CD) through a coupling between the nanostructures. We predict a huge enhancement of circular dichroism at the plasmon resonance when two chiral nanowires are intimately coupled in an achiral relative arrangement. Such an effect is even more pronounced when two chiral nanowires are coupled in a chiral relative arrangement. Individual component maps of rotator strength, partial contributions according to the magnetic dipole component, and induced densities allow us to fully rationalize these findings, thus opening the way to the field of plasmonic CD and its rational design.
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Дисертації з теми "Chiro-optical Response"

1

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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Анотація:
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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Тези доповідей конференцій з теми "Chiro-optical Response"

1

Singh, Haobijam Johnson, and Ambarish Ghosh. "Variability on the chiro-optical response of helically arranged metallic nanoparticles." In 2014 IEEE 2nd International Conference on Emerging Electronics (ICEE). IEEE, 2014. http://dx.doi.org/10.1109/icemelec.2014.7151198.

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2

Vogwell, Josh, Laura Rego, Olga Smirnova, and David Ayuso. "Ultrafast and All-Optical Imaging of Molecular Chirality via Low-Order Nonlinear Interactions." In CLEO: Fundamental Science. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/cleo_fs.2023.ff1b.4.

Повний текст джерела
Анотація:
We introduce an ultrafast chiro-optical method based on sum-frequency generation. In contrast to traditional implementations, the medium’s chirality is encoded in the intensity of the nonlinear response, rather than in its phase, with high efficiency
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3

Vogwell, Josh, Olga Smirnova, and David Ayuso. "Ultrafast, all-optical, and highly efficient imaging of molecular chirality via low-order nonlinear processes." In Conference on Lasers and Electro-Optics/Pacific Rim. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleopr.2022.ctua2c_02.

Повний текст джерела
Анотація:
We introduce an ultrafast chiro-optical method based on sum-frequency generation. In contrast to traditional implementations, the medium’s chirality is encoded in the intensity of the nonlinear response, rather than in its phase, with extreme efficiency.
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4

Nair, Greshma, Johnson Haobijam Singh, Murugesan Venkatapathi, and Ambarish Ghosh. "Metallic nanoparticles arranged in a Helical geometry: route towards strong and broadband chiro-optical response." In SPIE OPTO, edited by Ali Adibi, Shawn-Yu Lin, and Axel Scherer. SPIE, 2014. http://dx.doi.org/10.1117/12.2039320.

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5

Mayer, N., D. Ayuso, M. Ivanov, and O. Smirnova. "Structured synthetic chiral light with topological properties for robust and highly sensitive chiral discrimination." In CLEO: Fundamental Science. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/cleo_fs.2023.ff2b.1.

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Анотація:
Combining tailored multicolor beams we create light that displays chirality in the dipole approximation with spatially-varying handedness, leading to efficient, robust and highly sensitive chiro-optical responses with topological properties in chiral molecules.
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