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

Kuntman, Mehmet Ali; Kuntman, Ertan; Sancho‐Parramon, Jordi; Arteaga, Oriol

doi:10.1103/physrevb.98.045410

Cited by 16 publications

(21 citation statements)

References 50 publications

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“…It follows then due to reciprocity that optical activity may be detectable at large scattering angles when a source field is normally incident on a planar achiral structure. This phenomenon was recently confirmed by Kuntman et al ( 37 ) using a scattering matrix decomposition method. Note that the similarity between the calculated CDA and Δ A response (plotted under the conditions of Fig.…”

Section: Resultssupporting

confidence: 57%

Microscopic origin of the chiroptical response of optical media

et al. 2019

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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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Section: Resultssupporting

confidence: 57%

Microscopic origin of the chiroptical response of optical media

et al. 2019

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“…Even so, some simple geometries allow for an analytic treatment, for example the case of a dipole dimer, which is important because it mimicks the situation commonly described as exciton coupling in organic chemistry [57]. This case can be studied with the coupled dipole method and it is possible to calculate and decompose the Mueller matrix for any scattering direction [58].…”

Section: Comparison To a Modelmentioning

confidence: 99%

Mueller matrix polarimetry of bianisotropic materials [Invited]

Arteaga

Kahr

2019

J. Opt. Soc. Am. B

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Mueller Matrix polarimetry is a powerful optical technique for the characterization of both anisotropic and bianisotropic materials. This review emphasizes methods for the interpretation of measured Mueller matrices, from the meanings of matrix symmetries, to ab initio calculations of Mueller matrices that begin with Maxwell's equations operating on materials with permittivity, permeability and magnetoelectric constitutive tensors. We present an overview of polarimetry measurements in crystals as well as metamaterials that have optically responsive features on the order of the wavelength of visible light. Examples of the full measurement of the constitutive tensors of bianisotropic media from the analysis of their Mueller matrix, collected either in transmission or reflection, are illustrated for natural c rystals, polycrystals and nanofabricated metamaterials. Experimental and theoretical research into the complex optical responses of bianisotropic materials with polarized light is best expressed in terms of the Mueller matrix, as it offers an unambiguous and mathematically robust platform for analysis of light-matter interactions.

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“…Due to their aspect ratio and their localized surface plasmon response, metallic nanorods are highly sensitive to the polarization orientation of light. Moreover, when the gap distance between the antennas is small enough, the dipole modes of the individual nanorods will couple, hybridizing in bonding and antibonding modes, respectively, at higher and lower energies [13]. We show, through analytic calculations, that a very prominent non-reciprocal response appears when one considers 90 • scattering in the dimer.…”

Section: Introductionmentioning

confidence: 85%

“…A metallic nanorod can be considered as a particle that can only polarize along the direction of its axis because its polarizability tensor is fully anisotropic [13]. In the energy region of resonance, its scattering properties can be represented by the Jones matrix of a linear polarizer:…”

Section: Calculationsmentioning

confidence: 99%

“…As each particle of the dimer is close to the other, we have to consider mutual interaction contributions. Each one of the nanoantennas experiences the induced dipole field of its partner, so the dipole moment equations are a pair of coupled equations, as described in [18], and further developed in [13,19]. Assuming a plane wave excitation with electric field components E 0x and E 0y at the plane z = 0, we calculate the components of the far field electric vector for two orthogonal nanorods depicted in Figure 1, Case A, by taking into account the mutual interactions, as described in detail in Appendix A.…”

Section: Calculationsmentioning

confidence: 99%

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Asymmetric Scattering and Reciprocity in a Plasmonic Dimer

Kuntman¹,

Kuntman

Arteaga

2020

Symmetry

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We study the scattering of polarized light by two equal corner stacked Au nanorods that exhibit strong electromagnetic coupling. In the far field, this plasmonic dimer manifests very prominent asymmetric scattering in the transverse direction. Calculations based on a system of two coupled oscillators, as well as simulations based on the boundary element method, show that, while in one configuration both vertical and horizontal polarization states are scattered to the detector, when we interchange the source and the detector, the scattered intensity of the horizontal polarization drops to zero. Following Perrin’s criterion, it can be shown that this system, as well as any other linear system not involving magneto-optical effects, obeys the optical reciprocity principle. We show that the optical response of the plasmonic dimer, while preserving electromagnetic reciprocity, can be used for the non-reciprocal transfer of signals at a subwavelength scale.

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

Cited by 16 publications

References 50 publications

Microscopic origin of the chiroptical response of optical media

Microscopic origin of the chiroptical response of optical media

Mueller matrix polarimetry of bianisotropic materials [Invited]

Asymmetric Scattering and Reciprocity in a Plasmonic Dimer

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