scholarly journals Asymmetric Scattering and Reciprocity in a Plasmonic Dimer

Symmetry ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 1790
Author(s):  
Mehmet Ali Kuntman ◽  
Ertan Kuntman ◽  
Oriol Arteaga
Keyword(s):  
Coupled Oscillators ◽  
Transverse Direction ◽  
Electromagnetic Coupling ◽  
Polarized Light ◽  
Far Field ◽  
Reciprocity Principle ◽  
Horizontal Polarization ◽  
Optical Effects ◽  
Reciprocal Transfer ◽  
Method Show

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.

Interpretation of the optical rotatory dispersion in tellurium

2002 ◽  
Vol 35 (1) ◽  
pp. 96-102 ◽  
Author(s):  
Ivo Vyšín ◽  
Kamila Sváčková ◽  
Jan Říha
Keyword(s):  
Crystal Structure ◽  
Experimental Data ◽  
Mathematical Method ◽  
Least Squares ◽  
Coupled Oscillators ◽  
Polarized Light ◽  
Optical Rotatory Dispersion ◽  
Rotatory Dispersion ◽  
Recent Experimental Data ◽  
Optical Rotatory

An interpretation of the most recent experimental data on the optical rotatory dispersion of tellurium is presented. The experimental data are approximated by theoretical equations which were derived using the model of three coupled oscillators. The applied mathematical method is based on the sum of least squares. The derived equations are also helpful when modelling the circular dichroism of tellurium and discussing the sense of the rotation of the linear polarized light with regard to the crystal structure.

Far-field diffraction pattern of a nonideal retroreflector for polarized light with an oblique incidence

2020 ◽  
Vol 59 (8) ◽  
pp. 2621
Author(s):  
Zhou Hui ◽  
Li Song ◽  
Zhang Wenhao ◽  
Chen Yuwei
Keyword(s):  
Diffraction Pattern ◽  
Oblique Incidence ◽  
Polarized Light ◽  
Far Field

Near- and Far-Field Properties of Plasmonic Oligomers under Radially and Azimuthally Polarized Light Excitation

ACS Nano ◽  
2014 ◽  
Vol 8 (5) ◽  
pp. 4969-4974 ◽  
Author(s):  
Avner Yanai ◽  
Meir Grajower ◽  
Gilad M. Lerman ◽  
Mario Hentschel ◽  
Harald Giessen ◽  
...  
Keyword(s):  
Polarized Light ◽  
Far Field ◽  
Light Excitation

scholarly journals Mechanisms and behavioural functions of structural coloration in cephalopods

2008 ◽  
Vol 6 (suppl_2) ◽  
Author(s):  
Lydia M Mäthger ◽  
Eric J Denton ◽  
N. Justin Marshall ◽  
Roger T Hanlon
Keyword(s):  
Communication Channel ◽  
Polarized Light ◽  
Cell Types ◽  
Neural System ◽  
Structural Coloration ◽  
Wide Range ◽  
Optical Effects ◽  
Behavioural Interactions ◽  
Different Cell Types ◽  
And Diffusion

Octopus, squid and cuttlefish are renowned for rapid adaptive coloration that is used for a wide range of communication and camouflage. Structural coloration plays a key role in augmenting the skin patterning that is produced largely by neurally controlled pigmented chromatophore organs. While most iridescence and white scattering is produced by passive reflectance or diffusion, some iridophores in squid are actively controlled via a unique cholinergic, non-synaptic neural system. We review the recent anatomical and experimental evidence regarding the mechanisms of reflection and diffusion of light by the different cell types (iridophores and leucophores) of various cephalopod species. The structures that are responsible for the optical effects of some iridophores and leucophores have recently been shown to be proteins. Optical interactions with the overlying pigmented chromatophores are complex, and the recent measurements are presented and synthesized. Polarized light reflected from iridophores can be passed through the chromatophores, thus enabling the use of a discrete communication channel, because cephalopods are especially sensitive to polarized light. We illustrate how structural coloration contributes to the overall appearance of the cephalopods during intra- and interspecific behavioural interactions including camouflage.

scholarly journals Optical and Infrared Helical Metamaterials

Nanophotonics ◽  
2016 ◽  
Vol 5 (4) ◽  
pp. 510-523 ◽  
Author(s):  
Johannes Kaschke ◽  
Martin Wegener
Keyword(s):  
Electron Beam Lithography ◽  
Three Dimensional ◽  
Far Field ◽  
Optical Performance ◽  
Chiral Metamaterials ◽  
The Past ◽  
Optical Effects ◽  
Unit Cells ◽  
Novel Applications ◽  
Microfabrication Techniques

AbstractBy tailoring metamaterials with chiral unit cells, giant optical activity and strong circular dichroism have been achieved successfully over the past decade. Metamaterials based on arrays of metal helices have revolutionized the field of chiral metamaterials, because of their capability of exhibiting these pronounced chiro-optical effects over previously unmatched bandwidths. More recently, a large number of new metamaterial designs based on metal helices have been introduced with either optimized optical performance or other chiro-optical properties for novel applications.The fabrication of helical metamaterials is, however, challenging and even more so with growing complexity of the metamaterial designs. As conventional two-dimensional nanofabrication methods, for example, electron-beam lithography, are not well suited for helical metamaterials, the development of novel three-dimensional fabrication approaches has been triggered.Here, we will discuss the theory for helical metamaterials and the principle of operation. We also review advancements in helical metamaterial design and their limitations and influence on optical performance. Furthermore, we will compare novel nano- and microfabrication techniques that have successfully yielded metallic helical metamaterials. Finally, we also discuss recently presented applications of helical metamaterials extending beyond the use of far-field circular polarizers.

scholarly journals Far-field sub-diffraction focusing lens based on binary amplitude-phase mask for linearly polarized light

2016 ◽  
Vol 24 (10) ◽  
pp. 11002 ◽  
Author(s):  
Gang Chen ◽  
Kun Zhang ◽  
Anping Yu ◽  
Xianyou Wang ◽  
Zhihai Zhang ◽  
...  
Keyword(s):  
Polarized Light ◽  
Phase Mask ◽  
Far Field ◽  
Linearly Polarized ◽  
Focusing Lens

scholarly journals Topological magneto-optical effects and their quantization in noncoplanar antiferromagnets

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Wanxiang Feng ◽  
Jan-Philipp Hanke ◽  
Xiaodong Zhou ◽  
Guang-Yu Guo ◽  
Stefan Blügel ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Polarized Light ◽  
Low Frequency ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Exchange Splitting ◽  
Frequency Limit ◽  
Global Properties ◽  
Optical Effects

AbstractReflecting the fundamental interactions of polarized light with magnetic matter, magneto-optical effects are well known since more than a century. The emergence of these phenomena is commonly attributed to the interplay between exchange splitting and spin-orbit coupling in the electronic structure of magnets. Using theoretical arguments, we demonstrate that topological magneto-optical effects can arise in noncoplanar antiferromagnets due to the finite scalar spin chirality, without any reference to exchange splitting or spin-orbit coupling. We propose spectral integrals of certain magneto-optical quantities that uncover the unique topological nature of the discovered effect. We also find that the Kerr and Faraday rotation angles can be quantized in insulating topological antiferromagnets in the low-frequency limit, owing to nontrivial global properties that manifest in quantum topological magneto-optical effects. Although the predicted topological and quantum topological magneto-optical effects are fundamentally distinct from conventional light-matter interactions, they can be measured by readily available experimental techniques.

SELF-FOCUSING EFFECTS AND APPLICATIONS USING THIN NONLINEAR MEDIA

1992 ◽  
Vol 01 (03) ◽  
pp. 541-561 ◽  
Author(s):  
J.A. HERMANN
Keyword(s):  
Laser Beam ◽  
Nonlinear Optical ◽  
Far Field ◽  
Nonlinear Media ◽  
Self Focusing ◽  
Optical Effects ◽  
Nonlinear Optical Effects

A model of the nonlinear optical effects attending the interaction of a laser beam with a thin Kerr-type medium has been analyzed in detail. The formalism developed is applicable to both near- and far-field situations. Some possible applications are discussed.

scholarly journals Multinet Growth in the Cell Wall of Nitella

1960 ◽  
Vol 7 (2) ◽  
pp. 289-296 ◽  
Author(s):  
Paul B. Green
Keyword(s):  
Cell Wall ◽  
Cell Walls ◽  
Transverse Direction ◽  
Quantitative Description ◽  
Polarized Light ◽  
Axial Direction ◽  
Plant Cell Walls ◽  
Transverse Orientation ◽  
Inner Surface ◽  
Crystalline Matrix

Plant cell walls typically consist of crystalline microfibrils embedded in a non-crystalline matrix. The growing cylindrical Nitella cell wall contains microfibrils predominantly oriented in the transverse direction. The present study has shown that the transversely oriented microfibrils are primarily located toward the inner surface of the wall and that, proceeding outward from the inner surface, the wall contains microfibrils of ever poorer transverse orientation, the fibrils being randomly or axially arranged in the outermost regions of the wall. Because cell expansion is primarily in the axial direction, the texture of the fibrillar elements of the wall can be explained by assuming that new microfibrils of transverse orientation are added only at the inner surface of the wall and that they become passively reoriented to the axial direction during cell elongation. The described structure corresponds to that proposed by Roelofsen and Houwink for cells showing "multi-net growth." The demonstration of a continuous gradient of microfibrillar arrangement and its partial quantitative description was accomplished by the analysis, with the polarized light and interference microscopes, of wedge-like torn edges of developing cell walls which were 1 micron or less in optical thickness.

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