Coupled states of electromagnetic fields with magnetic-dipolar-mode vortices: Magnetic-dipolar-mode vortex polaritons

Journal of Applied Physics

Shavit

2013

Self Cite

The wide range of interesting electromagnetic behavior of contemporary materials requires that experimentalists working in this field master many diverse measurement techniques and have a broad understanding of condensed matter physics and biophysics. Measurement of the electromagnetic response of materials at microwave frequencies is important for both fundamental and practical reasons. In this paper, we propose a novel near-field microwave sensor with application to material characterization, biology, and nanotechnology. The sensor is based on a subwavelength ferrite-disk resonator with magnetic-dipolar-mode (MDM) oscillations. Strong energy concentration and unique topological structures of the near fields originated from the MDM resonators allow effective measuring material parameters in microwaves, both for ordinary structures and objects with chiral properties. PACS number(s): 76.50.+g; 78.70.Gq; 87.50.S

Section: Discussion On Credibility Of the Numerical Resultsmentioning

confidence: 89%

Section: Microwave Chirality Discriminationmentioning

confidence: 90%

Section: Microwave Superchiral Fieldsmentioning

confidence: 99%

“…3 by single and double primes, were analyzed in details in Ref. [20]. The near fields at the MDM resonances are characterized by the helicity properties.…”

Section: Materials Characterizationmentioning

confidence: 99%

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Novel microwave near-field sensors for material characterization, biology, and nanotechnology

Joffe

Journal of Applied Physics

Shavit

2013

Self Cite

“…There are small ferrite particles with magnetic-dipolar-mode (MDM) [or magnetostatic (MS)] oscillations [13]. In a series of recent publications, it was shown that small ferrite-disk particles may have unique spectral properties of MDM oscillations and the near fields originated from such particles are microwave superchiral fields with strong subwavelength localization of electromagnetic energy [14][15][16][17][18][19][20][21]. Specific long-distance topological properties of these fields are exhibited in the effects of path-dependent interference [22].…”

Section: Introductionmentioning

confidence: 99%

Magnetic-Dipolar-Mode Oscillations for Near- And Far-Field Manipulation of Microwave Radiation

Joffe²,

Berezin³

et al. 2013

PIER B

Abstract-There has been a surge of interest in the subwavelength confinement effects of the electromagnetic fields. Based on these effects, one can obtain new behaviors of the near-and far-field radiation.It is well known that in optics, the subwavelength confinement can be obtained due to surface-plasmon (or electrostatic) oscillations in metal structures. This paper is a review of recent studies on the subwavelength confinement in microwaves due to magnetic-dipolar-mode (MDM) [or magnetostatic (MS)] oscillations in small ferrite samples. MDM oscillations in a mesoscopic ferritedisk particle are quantized oscillations, which are characterized by energy eigenstates. The field structures are distinguished by powerflow vortices and non-zero helicity. Also in vacuum, the near fields originated from MDM particles are designated by topologically distinctive power-flow vortices, non-zero helicity, and a torsion degree of freedom.To differentiate such field structures from regular electromagnetic (EM) field structures, we term them as magnetoelectric (ME) fields. In a pattern of the microwave field scattered by a MDM ferrite disk and MDM-disk arrays, one can observe rotating topological-phase dislocations. This opens a perspective for creation of engineered electromagnetic fields with unique symmetry properties. In the near-field applications, we propose novel microwave sensors for material characterization, biology, and nanotechnology. Strong energy concentration and unique topological structures of the near fields originated from the MDM resonators allow effective measuring chiral properties of materials in microwaves. Generating

Magnetoelectric Near Fields

Topics in Applied Physics

2021

Similar to electromagnetic (EM) phenomena, described by Maxwell equations, physics of magnetoelectric (ME) phenomena deals with the fundamental problems of the relationship between electric and magnetic fields. The different nature of these two notions is especially evident in dynamic regimes. Analyzing the EM phenomena inside the ME material, the question arises: What kind of the near fields, originated from a sample of such a material, can be measured? Observation of the ME states requires an experimental technique characterized by a violation of spatial and temporal inversion symmetries in a subwavelength region. This presumes the existence of specific near fields. Recently, such field structures, called ME fields, were found as the near fields of a quasi-2D subwavelength-size ferrite disk with magnetic-dipolar-mode (MDM) oscillations. The key physical characteristics that determine the configurations of the ME near fields are the spin and orbital angular momenta of the quantum states of the MDM spectra. This leads to the appearance of subwavelength power-flow vortices. By virtue of unique topology, the ME quantum fluctuations in vacuum are different from virtual EM photons. While preserving the ME properties, one observes strong enhancing the near-field intensity. The main purpose of this chapter is to review and analyze the studies of the ME fields. We consider the near-field topological singularities originated from the MDM ferrite-disk particle. These topological features can be transmitted to various types of nonmagnetic material structures.