Chiral structure control of metal nano-needles fabrictaed by optical vortex laser ablation

Takahashi, Fumie; Toyoda, Kohei; Takizawa, Shun; Miyamoto, Katsuhiko; Morita, Ryuji; Omatsu, Takashige

doi:10.1364/cleo_si.2013.cm3h.6

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…We see that topological beams have vanishing in-plane components at the center reflecting their spatial profile while those of the Gaussians beam are the strongest there. Optical vortices carry an orbital angular momentum (not a spin angular momentum) and their applications to condensed matter physics have begun to be actively explored in very recent years [33][34][35][36][37][38][39]. Applications of CV beams to solid state physics are, on the other hand, not explored well.…”

Section: Vector Beammentioning

confidence: 99%

Nonequilibrium Magnetic Oscillation with Cylindrical Vector Beams

Fujita

Sato

2018

Sci Rep

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Magnetic oscillation is a generic property of electronic conductors under magnetic fields and widely appreciated as a useful probe of their electronic band structure, i.e. the Fermi surface geometry. However, the usage of the strong static magnetic field makes the measurement insensitive to the magnetic order of the target material. That is, the magnetic order is anyhow turned into a forced ferrromagnetic one. Here we theoretically propose an experimental method of measuring the magnetic oscillation in a magnetic-order-resolved way by using the azimuthal cylindrical vector (CV) beam, an example of topological lightwaves. The azimuthal CV beam is unique in that, when focused tightly, it develops a pure longitudinal magnetic field. We argue that this characteristic focusing property and the discrepancy in the relaxation timescale between conduction electrons and localized magnetic moments allow us to develop the nonequilibrium analogue of the magnetic oscillation measurement. Our optical method would be also applicable to metals under the ultra-high pressure of diamond anvil cells.

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Section: Vector Beammentioning

confidence: 99%

Nonequilibrium Magnetic Oscillation with Cylindrical Vector Beams

Fujita

Sato

2018

Sci Rep

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“…There are a number of applications of optical vortices in optics, condensed matter physics, biology, and so on [35][36][37][38][39][40][41][42] including the stimulated emission depletion microscopy 35 which is awarded the Novel prize in chemistry in 2014. Compared to optical vortices, however, the use of CVBs outside optics is, not well explored 43 .…”

Section: Cylindrical Vector Beammentioning

confidence: 99%

Accessing electromagnetic properties of matter with cylindrical vector beams

2019

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Cylindrical vector beam (CVB) is a structured lightwave characterized by its topologically nontrivial nature of the optical polarization. The unique electromagnetic field configuration of CVBs has been exploited to optical tweezers, laser accelerations, and so on. However, use of CVBs in research fields outside optics such as condensed matter physics has not progressed. In this paper, we propose potential applications of CVBs to those fields based on a general argument on their absorption by matter. We show that pulse azimuthal CVBs around terahertz or far-infrared frequencies can be a unique and powerful mean for time-resolved spectroscopy of magnetic properties of matter and claim that an azimuthal electric field of a pulse CVB would be a novel way of studying and controlling edge currents in topological materials. We also demonstrate how powerful CVBs will be as a tool for Floquet engineering of nonequilibrium states of matter.

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“…Applications of optical vortices are actively explored. We can transfer their OAM to classical particles [6][7][8] or excitons 9 to induce rotational motion of them or use their phase structure to realize super-resolution microscopy 10 and chiral laser ablation [11][12][13][14][15][16] to name a few. Compared to those of optical vortices, applications of electron vortex beams have been not so much discussed yet, but, for example, we can use them to achieve direct imaging of electron Landau levels 17 .…”

Section: Introductionmentioning

confidence: 99%

Ultrafast generation of skyrmionic defects with vortex beams: Printing laser profiles on magnets

2017

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Controlling electric and magnetic properties of matter by laser beams is actively explored in the broad region of condensed matter physics, including spintronics and magneto-optics. Here we theoretically propose an application of optical and electron vortex beams carrying intrinsic orbital angular momentum to chiral ferro-and antiferro-magnets. We analyze the time evolution of spins in chiral magnets under irradiation of vortex beams, by using stochastic Landau-LifshitzGilbert equation. We show that beam-driven nonuniform temperature lead to a class of ring-shaped magnetic defects, what we call skyrmion multiplex, as well as conventional skyrmions. We discuss the proper beam parameters and the way of applying the beams for the creation of these topological defects. Our findings provide an ultrafast way of generating and controlling microscopic magnetic textures in solids with vortex beams.

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Chiral structure control of metal nano-needles fabrictaed by optical vortex laser ablation

Cited by 3 publications

References 4 publications

Nonequilibrium Magnetic Oscillation with Cylindrical Vector Beams

Nonequilibrium Magnetic Oscillation with Cylindrical Vector Beams

Accessing electromagnetic properties of matter with cylindrical vector beams

Ultrafast generation of skyrmionic defects with vortex beams: Printing laser profiles on magnets

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