Magnetic Field Induced by Various Input Beam Polarizations in All-Optical Magnetic Recording

Vienne, Guillaume; Eason, Kwaku; Xie, Zhixiong; Lim, Yu Ting; Li, Jianming

doi:10.1143/jjap.50.09md03

Cited by 4 publications

(3 citation statements)

References 26 publications

(48 reference statements)

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“…The numerical model was defined, solved and analyzed using the commercial software COMSOL 4.1 Multiphysics. Since in AOMR the circularly polarized light is the most favorable polarization -it leads to three desirable features for the optically-induced magnetization: a relatively high spatial confinement, a direction nearly perpendicular to the opto-magnetic medium and a large magnitude [60,61] -, a single mode with circular polarization is launched into the microfiber tip conical cut structure shown in Fig. 3.…”

Section: Device Designmentioning

confidence: 99%

Efficient light confinement with nanostructured optical microfiber tips

Ding

Fenwick

Stasio

et al. 2012

Optics Communications

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Nanostructured optical microfiber tips are proposed and experimentally demonstrated to efficiently confine light beyond the diffraction limit at high powers. Focused ion beam milling was used for the nanostructuring of gold-coated optical microfiber tips with both single-ramp and wedge geometries. Small apertures were formed by flat cutting or hole drilling and optical spot sizes of ~λ/10 with high transmission efficiency were achieved. Numerical simulations were carried out to optimize the device design with circularly polarized light. Enhanced transmission efficiencies (higher than 10 -2 ) were recorded by optimizing the overall light throughput along the fiber tips. The tip thermal behavior was investigated by launching high powers into the device and recording the tip position in a scanning optical near-field microscopy set-up. This nanostructured optical microfiber tip has the potential for applications in optical recording, scanning near-field optical microscopy and lithography.

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Section: Device Designmentioning

confidence: 99%

Efficient light confinement with nanostructured optical microfiber tips

Ding

Fenwick

Stasio

et al. 2012

Optics Communications

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“…Relativistic electron bunches [5] have proven effective but the need for electron accelerators has limited their use. Alternative techniques based on the inverse-Faraday effect and on the optically-induced spin-orbit coupling effect rely on pulses of light to generate ultrafast magnetic pulses [6][7][8]. They are limited to a few material systems and are not amenable to strong spatial confinement of the magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Novel layout of a bi-metallic nanoring for magnetic field pulse generation from light

et al. 2015

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Recently Tsiatmas et al proposed using a nanoring made of two different metallic sectors to generate a magnetic pulse from a laser pulse [1]. Non-uniform heating of the ring creates very large temperature gradients, which drive thermoelectric currents, and this creates a localized magnetic field. However, heat from the laser pulse may result in the melting of the nanoring. We propose a symmetric structure made of four metallic sectors, which results in a higher magnetic field generation together with a lower lattice temperature. We also show that the magnetic field depends strongly on the size of the metallic sectors and interpret the results with the help of the electromotive forces, the overall ring resistance, and Biot-Savart law.

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“…It was shown that all-optical magnetic super-resolution can be achieved by using binary amplitude and phase filters [7]. Recently the structure of circularly polarized evanescent waves in the focal region of the solid immersion lens with a sub-wavelength structure located at its bottom surface is analyzed and its application in high density magneto-optical recording is proposed [8,9]. However, it is observed that use of those techniques can reduce the magnetic focal point, but it cannot increase the depth of focus (DOF) of the field simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Generation of sub-wavelength longitudinal magnetic probe using high numerical aperture lens axicon and binary phase plate

Ravi

Suresh²,

Rajesh³

et al. 2012

J. Opt.

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We propose to use a pure-phase filter in combination with a high NA lens axicon to achieve a sub-wavelength magnetic focal spot with large uniform magnetization depth when illuminated by a circularly polarized beam. The magnetization distributions are derived and evaluated based on the vector diffraction theory and the inverse Faraday effect of the isotropic and non-magnetically ordered material. With this kind of system, the longitudinal magnetization depth is increased to 12.82λ and the magnetic spot size has been reduced to 0.38λ. However, in the conventional lens with the same NA, the FWHM of the magnetic spot is found to be 0.43λ and its corresponding magnetization depth is only 0.89λ. We expect such a sub-wavelength strong longitudinal magnetic field with large magnetization depth can be widely used in high density magneto-optic recording and the scanning near-field magnetic microscope for studies of magnetic responses of sub-wavelength elementary cells of metamaterials.

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Magnetic Field Induced by Various Input Beam Polarizations in All-Optical Magnetic Recording

Cited by 4 publications

References 26 publications

Efficient light confinement with nanostructured optical microfiber tips

Efficient light confinement with nanostructured optical microfiber tips

Novel layout of a bi-metallic nanoring for magnetic field pulse generation from light

Generation of sub-wavelength longitudinal magnetic probe using high numerical aperture lens axicon and binary phase plate

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