In search of photon's elementary axial magnetostatic field

Raja, M. Yasin Akhtar; Sisk, Wade N.; Yousaf, Muhammad; Allen, David

doi:10.1007/s003400050148

Cited by 11 publications

(7 citation statements)

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“…The same authors also tried to measure the IFE in TGG in an all-optical pump-probe experiment with continuous-wave (cw) optical beams. 23 However, they concluded that the light-induced magnetization was too weak in the experiments to produce a detectable response. Our theoretical estimates presented above also predict that such a weak pump-induced magnetization would result in a response well below the sensitivity of our experimental apparatus.…”

Section: Discussionmentioning

confidence: 98%

Ultrafast inverse Faraday effect in a paramagnetic terbium gallium garnet crystal

2012

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Conventional wisdom dictates that magneto-optical and optomagnetic phenomena are reciprocal and of equal strength. We test this assumption in a pump-probe experimental study of the ultrafast inverse Faraday effect in a terbium gallium garnet crystal. The thorough quantitative analysis of the observed polarization response unambiguously demonstrates a remarkable discrepancy of several orders of magnitude between the strengths of the direct and the inverse effects. This finding further questions the validity of standard magnetic models relying on the use of the static Verdet constant on subpicosecond time scales.

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Section: Discussionmentioning

confidence: 98%

Ultrafast inverse Faraday effect in a paramagnetic terbium gallium garnet crystal

2012

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“…Equation (592) has been verified empirically by Raja et al [88] and Compton et al [89]. The most general type of solution must be found, however, by solving Eqs.…”

Section: á á á ð584þmentioning

confidence: 86%

“…The phenomenon of radiation is then removed by removing the Maxwell displacement current in Eqs. (88) and (92). This removes the radiated B (3) field and leaves the Gauss, Ampère, Coulomb, and Faraday laws of the received view at the expense of generality.…”

Section: Field Equations Of O(3) Electrodynamics In the Cartesian mentioning

confidence: 98%

O(3) Electrodynamics

Evans¹

Modern Nonlinear Optics, Part II

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“…[163] and in the follow-up work of Ref. [164] were not connected to ultrafast magnetization reversal. Rather, they were undertaken to investigate the possible existence of the "axial magnetostatic field of the photon" 2 proposed by Evans and Vigier [47].…”

Section: The Ultrafast Inverse Faraday Effectmentioning

confidence: 87%

“…Rather, they were undertaken to investigate the possible existence of the "axial magnetostatic field of the photon" 2 proposed by Evans and Vigier [47]. Their results confirmed that the IFE could be attributed to the effective magnetic field described in the previous sections; the existence of a magnetostatic field of the photon in vacuum has no experimental support [164]. While these results were both interesting and important, they provided no indication that the IFE could be technologically useful.…”

Section: The Ultrafast Inverse Faraday Effectmentioning

confidence: 93%

Ultrafast magnetization dynamics

Koopmans

Physics Subject Headings (PhySH)

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This thesis addresses ultrafast magnetization dynamics from a theoretical perspective. The manipulation of magnetization using the inverse Faraday effect has been studied, as well as magnetic relaxation processes in quantum dots.The inverse Faraday effect -the generation of a magnetic field by nonresonant, circularly polarized light -offers the possibility to control and reverse magnetization on a timescale of a few hundred femtoseconds. This is important both for the technological advantages and for the deeper fundamental understanding of magnetization dynamics that can be gained. However, several aspects of the inverse Faraday effect have remained poorly understood. The question of whether light can manipulate magnetization alone or whether an additional angular momentum reservoir is needed, in particular, remains unanswered.This question is answered here: the light beam that causes the inverse Faraday effect provides the angular momentum required for the magnetization to precess. No other reservoir is needed. This implies that manipulation of the magnetization occurs on the timescale of a laser pulse, which can be made extremely short. Even magnetization reversal on this timescale could be possible, provided a material with a sufficiently strong magnetooptical response can be found. This is a technical challenge, not a fundamental obstacle.The Faraday effect in the presence of optical birefringence has also been analyzed. This effect has been used for imaging magnetization dynamics in transparent media on an ultrafast timescale, but transparent magnetic materials usually have a complex crystal structure and complicated optical properties, which render the relationship between Faraday rotation and magnetization unclear. We have shown that the Faraday effect can be used to measure the instantaneous magnetization, even in the presence of birefringence, provided certain experimental conditions are met. Suggestions concerning these experimental conditions are made.The relaxation of magnetization, particularly the relaxation of a spin in a quantum dot, has been studied. This problem is relevant to the fields of quantum computing and highly-multiplexed optical memory, both of which are of great current interest. We have investigated the interaction of the spin with a metallic electrode and calculated the dephasing and dissipation rates. We found that under current experimental conditions, this relaxation pathway is negligible compared to spin-phonon scattering, but as systems are miniaturized, interactions with electrodes become more important.The methods developed to study the relaxation of a spin were also applied to the relaxation of a charge in a double quantum dot, another important problem in quantum computing. Again, we found that the interaction with a gate electrode is generally much weaker than the interaction with phonons but may be important for smaller systems. Kurzfassung

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In search of photon's elementary axial magnetostatic field

Cited by 11 publications

References 0 publications

Ultrafast inverse Faraday effect in a paramagnetic terbium gallium garnet crystal

Ultrafast inverse Faraday effect in a paramagnetic terbium gallium garnet crystal

O(3) Electrodynamics

Ultrafast magnetization dynamics

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