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Journal articles on the topic 'Chiro-optical Response'

Author: Grafiati
Published: 6 September 2023

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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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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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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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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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11

Zanotto, Simone, Giacomo Mazzamuto, Francesco Riboli, Giorgio Biasiol, Giuseppe C. La Rocca, Alessandro Tredicucci, and Alessandro Pitanti. "Photonic bands, superchirality, and inverse design of a chiral minimal metasurface." Nanophotonics 8, no. 12 (November 13, 2019): 2291–301. http://dx.doi.org/10.1515/nanoph-2019-0321.

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AbstractPhotonic band structures are a typical fingerprint of periodic optical structures, and are usually observed in spectroscopic quantities such as transmission, reflection, and absorption. Here we show that the chiro-optical response of a metasurface constituted by a lattice of non-centrosymmetric, L-shaped holes in a dielectric slab shows a band structure, where intrinsic and extrinsic chirality effects are clearly recognized and connected to localized and delocalized resonances. Superchiral near-fields can be excited in correspondence to these resonances, and anomalous behaviors as a function of the incidence polarization occur. Moreover, we have introduced a singular value decomposition (SVD) approach to show that the above mentioned effects are connected to specific fingerprints of the SVD spectra. Finally, by means of an inverse design technique we have demonstrated that the metasurface based on an L-shaped hole array is a minimal one. Indeed, its unit cell geometry depends on the smallest number of parameters needed to implement arbitrary transmission matrices compliant with the general symmetries for 2d-chiral structures. These observations enable more powerful wave operations in a lossless photonic environment.
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12

Srivastava, Bhartendu K., and Kannoth M. Muraleedharan. "Gel-based supramolecular ON–OFF switch from aryl-triazolyl peptides with excellent chiro-optical, thixotropic, and self-healing characteristics." Soft Matter 14, no. 9 (2018): 1631–36. http://dx.doi.org/10.1039/c8sm00050f.

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Systematic structure–property optimization of an achiral gelator (aryl-triazolyl homo dipeptide) through a fragment replacement approach led to the identification of a new chiral system having leucine as the C-terminal residue, which exhibits consistent and perfectly reversible chiro-optical responses on sol–gel transition.
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13

Khaliq, Hafiz Saad, Inki Kim, Aima Zahid, Joohoon Kim, Taejun Lee, Trevon Badloe, Yeseul Kim, et al. "Giant chiro-optical responses in multipolar-resonances-based single-layer dielectric metasurfaces." Photonics Research 9, no. 9 (August 11, 2021): 1667. http://dx.doi.org/10.1364/prj.424477.

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14

Manoccio, Mariachiara, Marco Esposito, Adriana Passaseo, Massimo Cuscunà, and Vittorianna Tasco. "Focused Ion Beam Processing for 3D Chiral Photonics Nanostructures." Micromachines 12, no. 1 (December 23, 2020): 6. http://dx.doi.org/10.3390/mi12010006.

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The focused ion beam (FIB) is a powerful piece of technology which has enabled scientific and technological advances in the realization and study of micro- and nano-systems in many research areas, such as nanotechnology, material science, and the microelectronic industry. Recently, its applications have been extended to the photonics field, owing to the possibility of developing systems with complex shapes, including 3D chiral shapes. Indeed, micro-/nano-structured elements with precise geometrical features at the nanoscale can be realized by FIB processing, with sizes that can be tailored in order to tune optical responses over a broad spectral region. In this review, we give an overview of recent efforts in this field which have involved FIB processing as a nanofabrication tool for photonics applications. In particular, we focus on FIB-induced deposition and FIB milling, employed to build 3D nanostructures and metasurfaces exhibiting intrinsic chirality. We describe the fabrication strategies present in the literature and the chiro-optical behavior of the developed structures. The achieved results pave the way for the creation of novel and advanced nanophotonic devices for many fields of application, ranging from polarization control to integration in photonic circuits to subwavelength imaging.
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15

Rego, Laura, Olga Smirnova, and David Ayuso. "Tilting light’s polarization plane to spatially separate the ultrafast nonlinear response of chiral molecules." Nanophotonics, April 11, 2023. http://dx.doi.org/10.1515/nanoph-2022-0802.

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Abstract Distinguishing between the left- and right-handed versions of a chiral molecule (enantiomers) is vital, but also inherently difficult. Traditional optical methods using elliptically/circularly polarized light rely on linear effects which arise beyond the electric-dipole approximation, posing major limitations for ultrafast spectroscopy. Here we show how to turn an ultrashort elliptical pulse into an efficient chiro-optical tool: by tilting its polarization plane towards its propagation direction. This forward tilt can be achieved by focusing the beam tightly, creating structured light which exhibits a nontrivial polarization pattern in space. Using state-of-the-art computational modelling, we show that our structured field realizes a near-field interferometer for efficient chiral recognition that separates the nonlinear optical response of left- and right-handed molecules in space. Our work provides a simple, yet highly efficient, way of spatially structuring the polarization of light to image molecular chirality, with extreme enantio-efficiency and on ultrafast time scales.
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