Beam shifts on reflection of electromagnetic radiation off anisotropic crystals at optic phonon frequencies

Macêdo, Rair; Dumelow, T.

doi:10.1088/2040-8978/15/1/014013

Cited by 22 publications

(12 citation statements)

References 29 publications

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“…The GH shift by magneto-optical (MO) materials 13 14 15 16 17 18 is obtained by making use of ferromagnetic resonances of natural magnetic materials. Similar relation between GH effects and intrinsic resonances was also reported in nonmagnetic dielectric, such as GH shifts arising from phonon resonances in crystal quartz 19 . But what was found in MO materials is of particular interest because of the nonreciprocity in scattering coefficients originated from the broken time reversal symmetry 20 .…”

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confidence: 76%

Magnetic control of Goos-Hänchen shifts in a yttrium-iron-garnet film

Sun

Gao

2017

Sci Rep

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We investigate the Goos-Hänchen (GH) shifts reflected and transmitted by a yttrium-iron-garnet (YIG) film for both normal and oblique incidence. It is found that the nonreciprocity effect of the MO material does not only result in a nonvanishing reflected shift at normal incidence, but also leads to a slab-thickness-independent term which breaks the symmetry between the reflected and transmitted shifts at oblique incidence. The asymptotic behaviors of the normal-incidence reflected shift are obtained in the vicinity of two characteristic frequencies corresponding to a minimum reflectivity and a total reflection, respectively. Moreover, the coexistence of two types of negative-reflected-shift (NRS) at oblique incidence is discussed. We show that the reversal of the shifts from positive to negative values can be realized by tuning the magnitude of applied magnetic field, the frequency of incident wave and the slab thickness as well as the incident angle. In addition, we further investigate two special cases for practical purposes: the reflected shift with a total reflection and the transmitted shift with a total transmission. Numerical simulations are also performed to verify our analytical results.

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confidence: 76%

Magnetic control of Goos-Hänchen shifts in a yttrium-iron-garnet film

Sun

Gao

2017

Sci Rep

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“…As seen from the angle of refraction plots, the regions where propagation along the surface is observed are drastically affected by the anisotropy orientation, and in the frequency range of type I hyperbolic behavior their range increases with the rotation angle φ. In these regions, optical effects such as Goos–Hänchen shifts , should occur, and such effects should depend on the direction of the anisotropy.…”

Section: Discussionmentioning

confidence: 99%

Oriented Asymmetric Wave Propagation and Refraction Bending in Hyperbolic Media

et al. 2018

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Crystal quartz is a well-known anisotropic medium with optically active phonons in the THz region where hyperbolic phonon-polaritons can be excited. Here, we use this material to illustrate how the behavior of bulk and surface hyperbolic polaritons can be drastically modified by changing the orientation of the crystalâĂŹs anisotropy axis with respect to its surface. We demonstrate, both theoretically and experimentally, phenomena associated with the orientation of hyperbolic media. We show the consequences of slight changes in the crystalâĂŹs orientation in various ways, from the creation of hyperbolic surface phonon-polaritons to the demonstration of oriented asymmetric transmission of radiation passing through a hyperbolic medium. arXiv:1812.04547v1 [cond-mat.mtrl-sci]

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“…where ρ(k y ) is the reflection amplitude and φ(k y ) is the associated phase change on reflection [21]. These are shown in Fig.…”

Section: Lateral Shifts and Nonreciprocitymentioning

confidence: 99%

“…5. The simulations shown use a plane wave spectrum model [21,20], of a Gaussian beam of width g = 0.2 cm incident on the surface of a semi-infinite antiferromagnet. In Fig.…”

Section: Lateral Shifts and Nonreciprocitymentioning

confidence: 99%

Electromagnetic Waves in Canted Magnets

Macêdo¹,

Stamps²

2020

Compendium on Electromagnetic Analysis

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The optical properties of canted antiferromagnetics is discussed from the perspective of magnetic polaritons and field tunable electromagnetic properties. Canted antiferromagnets have a weak magnetization and their electromagnetic properties can be affected by applied magnetic and in the case of multiferroics, applied electric fields. A theoretical approach is outlined here that is useful for describing the THz frequency electromagnetic response and properties of a large variety of canted spin systems. The properties of two example systems are discussed: an antiferromagnet with canted induced through an externally applied magnetic field, and an antiferromagnetic multiferroic wherein the magnetic sublattices are canted by an internal coupling to a spontaneous dielectric polarisation.

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Beam shifts on reflection of electromagnetic radiation off anisotropic crystals at optic phonon frequencies

Cited by 22 publications

References 29 publications

Magnetic control of Goos-Hänchen shifts in a yttrium-iron-garnet film

Magnetic control of Goos-Hänchen shifts in a yttrium-iron-garnet film

Oriented Asymmetric Wave Propagation and Refraction Bending in Hyperbolic Media

Electromagnetic Waves in Canted Magnets

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