3 Polarization of light: classical description

In intense-light systems, the traditional discrete optical components lead to high complexity and high cost. Metasurfaces, which have received increasing attention due to the ability to locally manipulate the amplitude, phase, and polarization of light, are promising for addressing this issue. In the study, a metasurface-based reflective deflector is investigated which is composed of silicon nanohole arrays that confine the strongest electric field in the air zone. Subsequently, the in-air electric field does not interact with the silicon material directly, attenuating the optothermal effect that causes laser damage. The highest reflectance of nanoholes can be above 99% while the strongest electric fields are tuned into the air zone. One presentative deflector is designed based on these nanoholes with in-air-hole field confinement and anti-damage potential. The 1st order of the meta-deflector has the highest reflectance of 55.74%, and the reflectance sum of all the orders of the meta-deflector is 92.38%. The optothermal simulations show that the meta-deflector can theoretically handle a maximum laser density of 0.24 W/µm2. The study provides an approach to improving the anti-damage property of the reflective phase-control metasurfaces for intense-light systems, which can be exploited in many applications, such as laser scalpels, laser cutting devices, etc.

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Classical description of the parameter space geometry in the Dicke and Lipkin-Meshkov-Glick models

Physical Review E ◽

10.1103/physreve.104.014113 ◽

2021 ◽

Vol 104 (1) ◽

Author(s):

Diego Gonzalez ◽

Daniel Gutiérrez-Ruiz ◽

J. David Vergara

Keyword(s):

Parameter Space ◽

Classical Description ◽

Space Geometry

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Faraday and Kerr Effects in Right and Left-Handed Films and Layered Materials

REVIEWS ON ADVANCED MATERIALS SCIENCE ◽

10.1515/rams-2020-0032 ◽

2020 ◽

Vol 59 (1) ◽

pp. 243-251

Author(s):

Josh Lofy ◽

Vladimir Gasparian ◽

Zhyrair Gevorkian ◽

Esther Jódar

Keyword(s):

Kerr Effect ◽

Tunneling Time ◽

The Real ◽

Left Handed ◽

Faraday Rotation Angle ◽

Time Problem ◽

Kerr Angle ◽

Polarization Of Light ◽

Effect Of Light ◽

Forbidden Gap

AbstractIn the present work, we study the rotations of the polarization of light propagating in right and left-handed films and layered structures. Through the use of complex values representing the rotations we analyze the transmission (Faraday effect) and reflections (Kerr effect) of light. It is shown that the real and imaginary parts of the complex angle of Faraday and Kerr rotations are odd and even functions for the refractive index n, respectively. In the thin film case with left-handed materials there are large resonant enhancements of the reflected Kerr angle that could be obtained experimentally. In the magnetic clock approach, used in the tunneling time problem, two characteristic time components are related to the real and imaginary portions of the complex Faraday rotation angle . The complex angle at the different propagation regimes through a finite stack of alternating right and left-handed materials is analyzed in detail. We found that, in spite of the fact that Re(θ) in the forbidden gap is almost zero, the Im(θ) changes drastically in both value and sign.

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Horndeski genesis: consistency of classical theory

Journal of High Energy Physics ◽

10.1007/jhep12(2020)107 ◽

2020 ◽

Vol 2020 (12) ◽

Author(s):

Yulia Ageeva ◽

Pavel Petrov ◽

Valery Rubakov

Keyword(s):

Strong Coupling ◽

Dimensional Analysis ◽

Classical Theory ◽

Arbitrary Order ◽

Specific Model ◽

Power Counting ◽

Coupling Energy ◽

Classical Description ◽

Higher Order Terms ◽

The Universe

Abstract Genesis within the Horndeski theory is one of possible scenarios for the start of the Universe. In this model, the absence of instabilities is obtained at the expense of the property that coefficients, serving as effective Planck masses, vanish in the asymptotics t → −∞, which signalizes the danger of strong coupling and inconsistency of the classical treatment. We investigate this problem in a specific model and extend the analysis of cubic action for perturbations (arXiv:2003.01202) to arbitrary order. Our study is based on power counting and dimensional analysis of the higher order terms. We derive the latter, find characteristic strong coupling energy scales and obtain the conditions for the validity of the classical description. Curiously, we find that the strongest condition is the same as that obtained in already examined cubic case.

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Sub-Hertz Spectral Analysis of Polarization of Light in a Transcontinental Submarine Cable

2020 European Conference on Optical Communications (ECOC) ◽

10.1109/ecoc48923.2020.9333176 ◽

2020 ◽

Author(s):

Mattia Cantono ◽

Valey Kamalov ◽

Vijay Vusirikala ◽

Massimiliano Salsi ◽

Matthew Newland ◽

...

Keyword(s):

Spectral Analysis ◽

Submarine Cable ◽

Polarization Of Light

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Coherence Effects in Multiple Medium-Induced Radiation

Proceedings ◽

10.3390/proceedings2019010011 ◽

2019 ◽

Vol 10 (1) ◽

pp. 11

Author(s):

Fabio Dominguez ◽

Jose Guilherme Milhano ◽

Carlos A. Salgado ◽

Konrad Tywoniuk ◽

Victor Vila

Keyword(s):

Time Scales ◽

Survival Probability ◽

Jet Quenching ◽

Close Correspondence ◽

Gluon Emission ◽

Classical Description ◽

Theoretical Support ◽

Coherence Effects ◽

Hard Gluon

In the first part of this work we study the color coherence phenomenon by considering the well-known quark-antiquark antenna with an in-medium hard gluon emission and an extra very soft emission outside it—double antenna. By discussing the coherence effects in terms of the survival probability, we generalize previous studies of the antenna radiation to the case of more than two emitters. After providing support to the jet quenching picture with effective emitters in the QCD cascade, we present a novel setup of an antenna splitting inside the medium taking into account the finite formation time of the dipole, which turns out to be an important scale. We read into the role of coherence and the relevant time scales which control the scenario, while also providing theoretical support for vacuum-like emissions early in the medium. Finally, by mapping the spectrum of in-medium splittings through the corresponding kinematical Lund diagram, we appreciate regimes of a close correspondence to a semi-classical description.

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