Equivalent source localization for stochastic electromagnetic fields

Haider, Michael; Russer, Johannes A.

doi:10.1109/iceaa.2017.8065563

Cited by 10 publications

(12 citation statements)

References 9 publications

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“…Moreover, the measurement of such an intriguing phenomenon would be feasible by means of the longitudinal magneto-optic Kerr effect that can detect the degree of strength of magnetization manifested just in the surface. [75][76][77] To do this, a pump-probe measurement is expected to be effective, in which a linear polarized laser causing the magneto-optic Kerr effect is incorporated as a probe in addition with the pump laser with the left-hand circular polarization.…”

Section: Physical Propertiesmentioning

confidence: 99%

Floquet-Weyl semimetals generated by an optically resonant interband-transition

Zhang,

Hino,

Maeshima

2022

Preprint

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Floquet-Weyl semimetals (FWSMs) generated by irradiation of a continuous-wave laser with lefthand circular polarization (rotating in counterclockwise sense with time) on II3-V2-type narrow gap semiconductor Zn3As2 are theoretically investigated, where the frequency of the laser is set nearly resonant with a band gap of the crystal. It is found that the excitation of the crystal by such a laser induce two types of FWSM phases that differ absolutely in characters. To be specific, the associated two pairs of Weyl points are stably formed by band touching between Floquet sidebands ascribable to a valence band labeled as Jz = ±3/2 and a conduction band labeled as Jz = ±1/2, where Jz represents the z-components of total angular momentum quantum number of Γ-point and a double sign corresponds. Here, one FWSM state composed of the up-spin Floquet sidebands relevant to Jz = 3/2 and 1/2 shows almost quadratic band-touching in the vicinity of the associated pair of Weyl points, while the other FWSM state composed of the down-spin Floquet sidebands relevant to Jz = −3/2 and −1/2 shows linear band-touching. Further, it is revealed that both up-spin and down-spin sidebands host nontrivial two-dimensional surface states that are pinned to the respective pairs of the Weyl points. Both surface states also show different energy dispersions and physical properties. More detailed discussion is made in the text on the origin of the above findings, chirality of the FWSM phases, laser-induced magnetic properties, and so on.

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Section: Physical Propertiesmentioning

confidence: 99%

Floquet-Weyl semimetals generated by an optically resonant interband-transition

Zhang,

Hino,

Maeshima

2022

Preprint

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“…In particular, optical isolators based on nonreciprocal mode conversion or phase shift are key components of optical networks, ensuring unidirectional propagation of light. [1][2][3][4][5][6] The nonreciprocity of a MO material is given by the off-diagonal terms of the permittivity tensor, and can be characterized by measuring the Faraday rotation. For the near-IR optical communications bands, materials based on Si substrates.…”

Section: Introductionmentioning

confidence: 99%

High Figure of Merit Magneto‐Optical Ce‐ and Bi‐Substituted Terbium Iron Garnet Films Integrated on Si

Fakhrul

Tazlaru

Khurana

et al. 2021

Advanced Optical Materials

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ferrimagnetic yttrium iron garnet (YIG, Y 3 Fe 5 O 12 ) offer a desirable combination of a high Faraday rotation and low optical absorption. Cerium-and bismuth-substituted yttrium iron garnet (CeYIG, BiYIG) have an excellent MO figure of merit (FoM, the ratio of Faraday rotation to optical absorption), [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] and bismuth iron garnet and paramagnetic terbium gallium garnet are both used in bulk optical isolators.In order to incorporate these complex oxides into photonic integrated circuits, films with high FoM must be grown onto photonic substrates and devices. Although YIG crystallizes readily on non-garnet substrates, it has a low Faraday rotation (≈+100° cm −1 at 1550 nm) [10] and FoM. Crystallization of CeYIG or BiYIG without secondary phases can be accomplished by depositing then annealing the film directly or by annealing a bilayer consisting of a YIG seedlayer placed either above or below the active MO layer. [12,13] When a seed layer is included, a top seed layer is preferable as it maximizes coupling of the MO garnet with an optical mode propagating through an underlying waveguide.Like YIG, rare earth garnets such as terbium iron garnet (TbIG) or dysprosium iron garnet [19,20] can crystallize directly on non-garnet substrates to form polycrystalline films. TbIG is a thermodynamically stable phase like YIG [21,22] which promotes garnet-phase crystallization without a seed layer. TbIG has a Faraday rotation in 1100-1550 nm wavelength range of ≈ +270 to +1000° cm −1 . [23][24][25] Bi-substituted TbIG has been grown by liquidphase epitaxy and flux methods [23][24][25][26][27] or sol-gel methods, [28] and more recently thin films of Ce-and Bi-substituted TbIG (CeTbIG, BiTbIG) were grown on Si by sputtering. [29][30][31][32][33][34] Sputtered BiTbIG with Bi substitution of 14% of the Tb sites has a Faraday rotation of ≈−500° cm −1 at 1550 nm, [29] the same sign as that of CeYIG, which at 1550 nm wavelength had a Faraday rotation of at least −3700° cm −1 . [29] CeTbIG films with Ce substituting up to 25% of the Tb sites showed a Faraday rotation above −3200 ± 200° cm −1 , [31,32] but a 44 nm thick magnetic dead layer formed between the waveguide and the CeTbIG, hindering the interaction of evanescent light with the MO garnet cladding. [32] However, the optical absorption and FoM of these Bi-and Cesubstituted TbIG materials have not yet been reported.In this paper, we report the growth, magnetic, and optical characteristics of polycrystalline thin films of TbIG, CeTbIG, and BiTbIG synthesized using pulsed laser deposition (PLD) on Films of polycrystalline terbium iron garnet (TbIG), cerium-substituted TbIG (CeTbIG), and bismuth-substituted TbIG (BiTbIG) are grown on Si substrates by pulsed laser deposition. The films grow under tensile strain due to thermal mismatch with the Si substrate, resulting in a dominant magnetoelastic anisotropy which, combined with shape anisotropy, leads to in-plane magnetization. TbIG has a compensation temperature of 253 K which is...

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“…More recently, bright and singular optical solitons types were obtained in materials with unusual properties than those known in nature, namely metamaterials with negative refractive index [8][9][10][11][12]. Special attention has been also paid to magneto-optic waveguides in recent days.…”

Section: Introductionmentioning

confidence: 99%

“…Special attention has been also paid to magneto-optic waveguides in recent days. It has been underscore that it presents specificities compared to waveguides of other dielectric materials [8,9,13]. The study of optical solitons in magneto-optic waveguides is strongly consolidated by the results which indicate that waveguides reduce the phenomenon associated with soliton disorder, losses and a virtual reduction of the famous cross-talk.…”

Section: Introductionmentioning

confidence: 99%

“…Studies done these days in the magneto-optic wavesguides are based on mathematical models with various nonlinearities such as kerr nonlinearity, power-law nonlinearity, parabolic-law nonlinearity and dual powerlaw nonlinearity in the presence of the coefficients of self-phase modulation, nonlinear dispersion, Raman effect and many others [8,9]. The particularity of the model, which has been the subject of an investigation in [8,9,13], lies in the fact that the coupling coefficient with the neighbour is taken into account as well as the XPM coefficients.…”

Section: Introductionmentioning

confidence: 99%

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Miscellaneous optical solitons in magneto-optic waveguides associated to the influence of the cross-phase modulation in instability spectra

Abbagari¹,

Houwe²,

Mukam³

et al. 2021

Phys. Scr.

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By employing the traveling-wave hypothesis to the coupled nonlinear Schrödinger equation (CNLSE), the constraint relation on metamaterials parameters and the auxiliary equation have been recovered successfully. Conjecturing the values of the coefficients of the auxiliary equation, a diversity of solutions have been constructed while respecting the conditions of existence of these solutions. By choosing adequate parameters, it is obtained W-shape bright, dark, kink, anti-kink like optical solitons for the CNLSE which controls waves in magneto-optic waveguides in the presence of cross-phase modulation (XMP). To deal with the influence of the XMP to Modulation Instability (MI), the linearization technique was adopted and the continuous wave (CW) solutions were used to obtaining the dispersion relation as well as the associated MI gain spectrum. The study of the MI gain spectrum have been done in the normal and anomalous dispersive regimes associated with zero-birefringence, linear-birefringence and circular birefringence. The MI gain spectrum curves illustrating the miscellaneous of optical solitons in the magneto-optic waveguides were obtained. It is noted that these results sufficiently illustrate the dynamic of the nonlinear optic fibers through the 3D and 2D spatiotemporal plot evolutions.

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Equivalent source localization for stochastic electromagnetic fields

Cited by 10 publications

References 9 publications

Floquet-Weyl semimetals generated by an optically resonant interband-transition

Floquet-Weyl semimetals generated by an optically resonant interband-transition

High Figure of Merit Magneto‐Optical Ce‐ and Bi‐Substituted Terbium Iron Garnet Films Integrated on Si

Miscellaneous optical solitons in magneto-optic waveguides associated to the influence of the cross-phase modulation in instability spectra

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