Gyrotropy in Achiral Materials: the Coupled Oscillator Model

Oates, Thomas W.; Shaykhutdinov, Timur; Wagner, Tolga; Furchner, Andreas; Hinrichs, Karsten

doi:10.1002/adma.201402012

Cited by 8 publications

(9 citation statements)

References 27 publications

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“…56,99,100,104 These findings can be generalized to other structures exhibiting magnetoelectric coupling at oblique incidence associated with circular anisotropy in achiral metasurfaces, e.g., a gyrotropic response. 105 Circular Dichroism in Chiral Metasurfaces. In this example, nanoscale measurements of CD of a chiral metasurface enantiomer performed by Khanikaev et al are presented (Fig.…”

Section: Anisotropy Of Plasmonic Metasurfacesmentioning

confidence: 99%

Polarization-Dependent Atomic Force Microscopy–Infrared Spectroscopy (AFM-IR): Infrared Nanopolarimetric Analysis of Structure and Anisotropy of Thin Films and Surfaces

Hinrichs

Shaykhutdinov

2018

Appl Spectrosc

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Infrared techniques enable nondestructive and label-free studies of thin films with high chemical and structural contrast. In this work, we review recent progress and perspectives in the nanoscale analysis of anisotropic materials using an extended version of the atomic force microscopy-infrared (AFM-IR) technique. This advanced photothermal technique, includes polarization control of the incoming light and bridges the gap in IR spectroscopic analysis of local anisotropic material properties. Such local anisotropy occurs in a wide range of materials during molecular nucleation, aggregation, and crystallization processes. However, analysis of the anisotropy in morphology and structure can be experimentally and theoretically demanding as it is related to order and disorder processes in ranges from nanoscopic to macroscopic length scales, depending on preparation and environmental conditions. In this context IR techniques can significantly assist as IR spectra can be interpreted in the framework of optical models and numerical calculations with respect to both, the present chemical conditions as well as the micro- and nanostructure. With these extraordinary analytic possibilities, the advanced AFM-IR approach is an essential puzzle piece in direction to connect nanoscale and macroscale anisotropic thin film properties experimentally. In this review, we highlight the analytic possibilities of AFM-IR for studies on nanoscale anisotropy with a set of examples for polymer, plasmonic, and polaritonic films, as well as aggregates of large molecules and proteins.

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Section: Anisotropy Of Plasmonic Metasurfacesmentioning

confidence: 99%

Polarization-Dependent Atomic Force Microscopy–Infrared Spectroscopy (AFM-IR): Infrared Nanopolarimetric Analysis of Structure and Anisotropy of Thin Films and Surfaces

Hinrichs

Shaykhutdinov

2018

Appl Spectrosc

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“…The emergence of chiroptical signals in certain systems with achiral geometries has been previously considered in molecules [36,37], crystals [38], and metamaterials [39,40]. Perhaps the most paradigmatic example is the water molecule [37] (point group C 2v ) where, due to the difference in electronegativity between the oxygen (O) and hydrogen (H) atoms, there is a dipole moment pointing from each H to the O.…”

Section: A Circular Polarization Effectsmentioning

confidence: 99%

Light scattering by coupled oriented dipoles: Decomposition of the scattering matrix

Kuntman

Sancho‐Parramon

et al. 2018

Phys. Rev. B

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“…In particular, the frequency range of optical activity can be tuned by changing the dimensions of chiral nanostructures 33 34 35 whereas the activity’s strength can be significantly enhanced by the nearby metallic nanoparticles 36 37 38 . Additional flexibility in the alteration of material activity comes from the freedom to arbitrarily arrange chiral or nonchiral meta-atoms in nonchiral or chiral superstructures 39 40 41 42 .…”

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confidence: 99%

Giant Optical Activity of Quantum Dots, Rods and Disks with Screw Dislocations

Baimuratov

Rukhlenko

Noskov

et al. 2015

Sci Rep

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For centuries mankind has been modifying the optical properties of materials: first, by elaborating the geometry and composition of structures made of materials found in nature, later by structuring the existing materials at a scale smaller than the operating wavelength. Here we suggest an original approach to introduce optical activity in nanostructured materials, by theoretically demonstrating that conventional achiral semiconducting nanocrystals become optically active in the presence of screw dislocations, which can naturally develop during the nanocrystal growth. We show the new properties to emerge due to the dislocation-induced distortion of the crystal lattice and the associated alteration of the nanocrystal’s electronic subsystem, which essentially modifies its interaction with external optical fields. The g-factors of intraband transitions in our nanocrystals are found comparable with dissymmetry factors of chiral plasmonic complexes, and exceeding the typical g-factors of chiral molecules by a factor of 1000. Optically active semiconducting nanocrystals—with chiral properties controllable by the nanocrystal dimensions, morphology, composition and blending ratio—will greatly benefit chemistry, biology and medicine by advancing enantiomeric recognition, sensing and resolution of chiral molecules.

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Gyrotropy in Achiral Materials: the Coupled Oscillator Model

Cited by 8 publications

References 27 publications

Polarization-Dependent Atomic Force Microscopy–Infrared Spectroscopy (AFM-IR): Infrared Nanopolarimetric Analysis of Structure and Anisotropy of Thin Films and Surfaces

Polarization-Dependent Atomic Force Microscopy–Infrared Spectroscopy (AFM-IR): Infrared Nanopolarimetric Analysis of Structure and Anisotropy of Thin Films and Surfaces

Light scattering by coupled oriented dipoles: Decomposition of the scattering matrix

Giant Optical Activity of Quantum Dots, Rods and Disks with Screw Dislocations

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