Systems with coupling between magnetic and plasmonic effects can bring new developments in fields of plasmonics and magnetics. In our work we fabricate and study permalloy surfaces with one-dimensional profile modulation and various modulation parameters. Using optical characterization, ferromagnetic resonance, Brillouin light scattering and numerical methods we show that such metasurfaces demonstrate in-plane magnetic anisotropy determined by the structural geometry, and support both spin-wave and surface plasmon polariton resonances determined by the modulation parameters and sample orientation. The combination of plasmonic and magnetic properties makes these structures potential candidates for applications in magnetically controlled plasmonics and optically controlled magnetics
We report here on dipolar coupling of spin waves propagating as guided modes of adjacent yttrium iron garnet stripes. Three stripes are placed parallel to each other and separated by gaps that are small enough to provide nearest-neighbor coupling. The origin of the coupling is the dipole field of the precessing magnetization vector. The micromagnetic numerical simulation, yielded spectra of spin waves through the magnonic structure. Analysis of those spectra revealed that the lateral structure can be used as a functional unit in planar magnonic networks – they can be utilized as a directional coupler, spin-wave multiplexer, or microwave power divider. Using Brillouin light scattering spectroscopy, we experimentally demonstrated spin-wave transport along the lateral stripes. We were able to control the spin-wave routing between the stripes by varying the bias angle of the magnetic field.
Here we report on bi-directional control of spin waves propagated in yttrium iron garnet (YIG) waveguide with Fe-Rh stripe placed on top of the central part of YIG. We use the micromagnetic numerical simulation to investigate spin-wave transport in multimode regime by the numerical solution of Landau-Lifshitz-Gilbert equation. Furthermore, we have explained the evolution of spin-wave signal in the proposed structure by means of 2D Fourier analysis revealing the spin-wave dispersion transformation. The transformation of the spin-wave transmission spectra demonstrates that the proposed structure will enable the control of spin-wave mode propagation by varying the temperature range of Fe-Rh close to the room temperature. Furthermore, the spin-wave signal can switch back and forth via a small variation of the temperature in Fe-Rh slab provided by the means of laser radiation. Analysis of those spectra revealed that YIG/Fe-Rh bilayer structure can be used as a functional unit in planar magnonic networks performing the spatio-frequency demultiplexing and spin-wave mode filtration regime.
Durability of bonded interfaces between dentin and a polymer material in resin-based composite restorations remains a clinical dentistry challenge. In the present study the evolution of bonded interfaces in biological active environment is estimated in vivo. A novel in vivo method of visual diagnostics that involves digital processing of color images of composite restorations and allows the evaluation of adhesive interface quality over time, has been developed and tested on a group of volunteers. However, the application of the method is limited to the analysis of superficial adhesive interfaces. Low-coherent optical computer tomography (OCT) has been tested as a powerful non-invasive tool for in vivo, in situ clinical diagnostics of adhesive interfaces over time. In the long-term perspective adhesive interface monitoring using standard methods of clinical diagnostics along with colour image analysis and OCT could make it possible to objectivise and prognosticate the clinical longevity of composite resin-based restorations with adhesive interfaces.
The process of the electromagnetic wave propagation in the nonlinear Bragg grating system has been numerically
studied. The nonlinear Kerr materials were considered. The values of the cut-off frequencies were approximately
estimated with the modification of the effective refractive index method. A Finite-Difference-Time-Domain method was
used to analyze the periodic nonlinear structures and to investigate the multiple gap-soliton formation within the
photonic bandgap of the Bragg grating. The possibility of propagation of the signal which frequency lies within the band
gap of the periodical structure was demonstrated. The process of soliton tunneling in the nonlinear 2D Bragg grating has
been investigated.
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