Mapping the near-field distribution of magnetic fields using a silicon nanoparticle at optical frequencies

Meng, Fanfei; Yang, Aiping; Shi, Peng; Du, Luping; Yuan, Xiaocong

doi:10.1088/1361-6463/ab2402

Cited by 6 publications

(2 citation statements)

References 32 publications

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“…Ellahi et al studied the effect of magneto hydro dynamics (MHD) heat transfer flow under the influence of slip over a moving flat plate, and examined the impact of the magnetic parameter, slip parameter and velocity ration parameter [25]. Meng et al proposed a flexible technique for mapping the longitudinal magnetic field using a nano-antenna probe, as well as analyzed the magnetic resonances of silicon nanoparticles; the directionally scattered light is extracted to reconstruct the longitudinal magnetic field distribution [26]. Ellahi et al studied a remedy for malign tissues, cells, or clogged arteries of the heart by means of permeating a slim tube in the body, and considered the effects of chemical reaction and activation energy on peristaltic transport of nanofluids [27].…”

Section: Introductionmentioning

confidence: 99%

Numerical model and finite element simulation of arterial blood flow profile reconstruction in a uniform magnetic field

Liu

Yang

Duo

et al. 2020

J. Phys. D: Appl. Phys.

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Since arterial blood has both fluidity and conductivity, the arterial blood flow area is equivalent to an electric current source under the action of a static magnetic field, thus forming an electric field within a certain range of the human body. Therefore, the distribution of arterial blood flow can be reconstructed by using electrodes to obtain the potential difference signal on the skin's surface. In this paper, firstly, a three-dimensional (3D) finite element simulation model of a human forearm artery was established in COMSOL to simulate the potential distribution under a uniform magnetic field and extract the potential difference data. Then, based on the integral equation of the electromagnetic reciprocity theorem and the Maxwell equation, a numerical model of the reconstructed arterial flow profile was derived in detail. Finally, the arterial location, velocity resolution and flow volume were reconstructed and analyzed respectively. The simulation results show that the correlation between the reconstructed image and the given image is above 0.82 and the highest is 0.91, the resolution of velocity imaging is 0.046 m s−1, and the mean relative error of the volume of the reconstructed blood flow is 0.820%. The above results showed good numerical accuracy, indicating the theoretical feasibility of using a uniform electromagnetic field to reconstruct the distribution of arterial blood flow.

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Section: Introductionmentioning

confidence: 99%

Numerical model and finite element simulation of arterial blood flow profile reconstruction in a uniform magnetic field

Liu

Yang

Duo

et al. 2020

J. Phys. D: Appl. Phys.

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“…In this letter, we demonstrate a simple and straightforward method to exclusively map the magnetic field intensity distribution of light with single spherical silicon (Si) nanoparticles. Such a Si nanoprobe has been recently used to probe the magnetic and longitudinal transverse density of light, but the employed far-field scattering based method can only resolve the longitudinal magnetic field component (i.e., H z ) or magnetic fields exhibiting spinning vector characters. Here we exploit the nonlinear optical emission properties of single Si nanoparticles, and show that such a nonlinear magnetic nanoprobe enables direct mapping of the intensity distributions of unknown magnetic fields with arbitrary electromagnetic structures thanks to its unique merits.…”

mentioning

confidence: 99%

Mapping the Magnetic Field Intensity of Light with the Nonlinear Optical Emission of a Silicon Nanoparticle

Xiang

Zhang

et al. 2021

Nano Lett.

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To detect the magnetic component of arbitrary unknown optical fields, a candidate probe must meet a list of demanding requirements, including a spatially isotropic magnetic response, suppressed electric effect, and wide operating bandwidth. Here, we show that a silicon nanoparticle satisfies all these requirements, and its optical magnetism driven multiphoton luminescence enables direct mapping of the magnetic field intensity distribution of a tightly focused femtosecond laser beam with varied polarization orientation and spatially overlapped electric and magnetic components. Our work establishes a powerful nonlinear optics paradigm for probing unknown optical magnetic fields of arbitrary electromagnetic structures, which is not only essential for realizing subwavelength-scale optical magnetometry but also facilitates nanophotonic research in the magnetic light–matter interaction regime.

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Measuring the magnetic topological spin structure of light using an anapole probe

Meng

Yang

et al. 2022

Light Sci Appl

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Topological spin structures of light, including the Skyrmion, Meron, and bi-Meron, are intriguing optical phenomena that arise from spin–orbit coupling. They have promising potential applications in nano-metrology, data storage, super-resolved imaging and chiral detection. Aside from the electric part of optical spin, of equal importance is the magnetic part, particularly the H-type electromagnetic modes for which the spin topological properties of the field are dominated by the magnetic field. However, their observation and measurement remains absent and faces difficult challenges. Here, we design a unique type of anapole probe to measure specifically the photonic spin structures dominated by magnetic fields. The probe is composed of an Ag-core and Si-shell nanosphere, which manifests as a pure magnetic dipole with no electric response. The effectiveness of the method was validated by characterizing the magnetic field distributions of various focused vector beams. It was subsequently employed to measure the magnetic topological spin structures, including individual Skyrmions and Meron/Skyrmion lattices for the first time. The proposed method may be a powerful tool to characterize the magnetic properties of optical spin and valuable in advancing spin photonics.

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Mapping the near-field distribution of magnetic fields using a silicon nanoparticle at optical frequencies

Cited by 6 publications

References 32 publications

Numerical model and finite element simulation of arterial blood flow profile reconstruction in a uniform magnetic field

Numerical model and finite element simulation of arterial blood flow profile reconstruction in a uniform magnetic field

Mapping the Magnetic Field Intensity of Light with the Nonlinear Optical Emission of a Silicon Nanoparticle

Measuring the magnetic topological spin structure of light using an anapole probe

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