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Microwaves in dispersive magnetic composite media (Review Article)
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View: Figures


Image of FIG. 1.
FIG. 1.

The structure under consideration (h, e are the magnetic and dielectric components of the ac field, H is the static magnetic field).

Image of FIG. 2.
FIG. 2.

Effective permeability of ferrite (brand 1SCH4, МS  = 4800 G) versus static magnetic field for the ordinary mode (h || H) and for the extraordinary mode (h⊥H) at f = 39 GHz.

Image of FIG. 3.
FIG. 3.

Shift of stop-bands in the transmission spectra of eight-layered 1D MPC for ordinary and extraordinary waves.

Image of FIG. 4.
FIG. 4.

The scheme of experiment.

Image of FIG. 5.
FIG. 5.

Frequency of the stop-band edges versus the magnetic field for two waves with the mutually perpendicular polarization: for the ordinary mode (curves 3, 4) and for the extraordinary mode (curves 1, 2).

Image of FIG. 6.
FIG. 6.

Scheme of polystyrene-air PC with ferrite “defect” layer.

Image of FIG. 7.
FIG. 7.

Experimental spectra of the “defect” mode in the 1D PC with ferrite “defect” layer.

Image of FIG. 8.
FIG. 8.

“Defect” mode frequency on the applied magnetic field for 1D PC.

Image of FIG. 9.
FIG. 9.

Experimental (a) and theoretical (b) spectra. Neighboring layer atthe left of the defect layer is dielectric, and at the right is ferrite, H 0 = 2kOe. Defect mode appeared in the forbidden zone (shaded).

Image of FIG. 10.
FIG. 10.

Experimental (a) and theoretical (b) spectra. Neighbouring layer at the left of the defect layer is ferrite, and at the right is dielectric, H 0 = 2 kOe. No defect mode appeared in the forbidden zone.

Image of FIG. 11.
FIG. 11.

Dependence of the “defect” peak frequency on the external magnetic field.

Image of FIG. 12.
FIG. 12.

Scheme of the structure under study.

Image of FIG. 13.
FIG. 13.

Experimental spectrum demonstrating the formation of the Tamm peak in the forbidden zone of the MPC for H 0 = 1880 Oe.

Image of FIG. 14.
FIG. 14.

Variation of the TS frequency with the change of the WM permittivity ɛ WM for magnetic field H 0 = 1880 Oe at da 1 = 1.5 mm.

Image of FIG. 15.
FIG. 15.

The scheme of experiment.

Image of FIG. 16.
FIG. 16.

The transmission of adjoining photonic crystals at zero magnetization: experimental data (1); the theoretical evaluation (2).

Image of FIG. 17.
FIG. 17.

The dependence of Tamm state frequency fTS on external magnetic field H ex.

Image of FIG. 18.
FIG. 18.

Tamm peak for the structure under study at H 0 = 120 Oe (a); the shift of Tamm peak frequency on the external magnetic field for the TE polarization (b); for the TE polarization (c).

Image of FIG. 19.
FIG. 19.

Dispersion dependence for the infinite structure.23

Image of FIG. 20.
FIG. 20.

Transmission spectra for different ferrite layer at different thickness d 1, mm: 0.5 (1); 1 (2); 1.5 (3), and magnetic field value 5.24 kOe.

Image of FIG. 21.
FIG. 21.

Ey distribution along Z axis for metamaterial with various dispersity (with different thickness of elementary cell d at permanent metamaterial length) at f = 26 GHz for various time moments.

Image of FIG. 22.
FIG. 22.

Scheme of the structure.

Image of FIG. 23.
FIG. 23.

The frequency dependencies of the effective parameters.24

Image of FIG. 24.
FIG. 24.

|T|2 as a function of the frequency f for various collision frequencies.24

Image of FIG. 25.
FIG. 25.

Transmission spectra of various structures: H 0 = 0 Oe, WBR in RHM (a); H 0 = 6570 Oe, WBR in LHM (b).

Image of FIG. 26.
FIG. 26.

Experimental dependence of resonance peaks position on magnetic field. One can watch as well an appearance of low-frequency mode (satellite one) of WBR in RHM at H > 9 kOe (crosses) (a); transmission spectra of ferrite/semiconductor composite at various fields (b).

Image of FIG. 27.
FIG. 27.

The composite structure under study (a) and the transmission spectra of various structures at H = 6570 Oe (b).

Image of FIG. 28.
FIG. 28.

Calculated ferrite permeability real part at H = 6570 Oe (a); the character peaks position versus magnetic field (b).

Image of FIG. 29.
FIG. 29.

The T-junction waveguide with metamaterial prism: scheme.

Image of FIG. 30.
FIG. 30.

Experimental results for transmission spectrum of the composite prism on magnetic field 7240 Oe (a); the spatial distribution of e-component of the extra high-frequency field for T-junction (H = 7240 Oe, f = 36.2 GHz) (b).

Image of FIG. 31.
FIG. 31.

Ferrite/wire medium structure (a). Experimental transmission coefficient for ferrite/wire medium structure and its components. H st = 6.84 kOe. WM (1), ferrite layer medium (2), ferrite/wire medium structure (3) (b).

Image of FIG. 32.
FIG. 32.

Ferrite/thin-metal layer structure (a); the experimental transmission coefficient for ferrite/thin-metal layer structure. H st = 7.0 kOe. Copper thin metal layer structure (1), ferrite medium (2), composite structure (3) (b).

Image of FIG. 33.
FIG. 33.

The structure under study: scheme (a); overview (b): photonic crystal (PC) (1), La0.775Sr0.225MnO3 specimen (2).

Image of FIG. 34.
FIG. 34.

Experimental (left) and simulated (right) transmission spectra: Forbidden zone for PC without a boundary medium (a); zone spectrum for PC bounded by La0.775Sr0.225MnO3 specimen (at H = 0. Red solid arrow—the Tamm peak 1) (b); zone spectrum for PC bounded by ferromagnet conductive medium, H > 0. Blue dashed arrow—peak 2 (DNG peak) (c).

Image of FIG. 35.
FIG. 35.

Configuration of the structure under study.

Image of FIG. 36.
FIG. 36.

Typical position of the DNG zone at different magnetic field H, kOe: 1.1 (1), 1.93 (2), 2.7 (3), 3.42 (4), 4.43 (5) (a); the dispersion curve for sintered lanthanum-strontium manganite La0.775Sr0.225MnO3 (b).

Image of FIG. 37.
FIG. 37.

The ray tracing in the left handed prism50 (a); the transmission spectra through the “straight” channel (S21) and “perpendicular” channel (S31) for H = 0 and at H = 8150 Oe (b).

Image of FIG. 38.
FIG. 38.

The photo of the test bench (a) and a typical MPC structure between horns and between poles of magnet (b).

Image of FIG. 39.
FIG. 39.

The scanning system for the spatial field distribution in PC detecting.

Image of FIG. 40.
FIG. 40.

The axially symmetric microwave 1D photonic crystals: for ambient space research: ferrite/polystyrene/air-gap MPC (a); teflon/quartz PC diameter of disks is about ≈ 5–7 λ (b).

Image of FIG. 41.
FIG. 41.

Ferrite/quartz MPC (a); metal/quartz PC (b); axially symmetrical MPC and PC (ferrite/quartz/teflon) (c). Diameter of disks is about ≈ λ.

Image of FIG. 42.
FIG. 42.

The MPC crystals for study Tamm states in waveguide regime: MPC bounded with plasma-like medium (the wire-medium) ɛ < 0 (a,b); PC bound with ferrite μ < 0 (c); the mirror-reflected MPС made from ferrite plates 7.2 × 3.4 mm (d).

Image of FIG. 43.
FIG. 43.

The elements should be inserted into waveguides: wire-media (the anisotropy plasma-like media) with various density (a,b); disk-media (the isotropy plasma-like media) (c). The plasma frequency of about (2–8)·102 GHz.

Image of FIG. 44.
FIG. 44.

Samples of magnetically controlled left-handed media: Wire-media/ferrite made from plates (a); InSb/ferrite structures made from thin sticks of each element (b). Size of elements satisfied to d ≪ λ.

Image of FIG. 45.
FIG. 45.

Left-handed media prisms: ferrite/InSb plates and sticks (a,b); the sintered manganite-perovskite powder (c); experimental setup (T-bridge) to detect the negative refraction coefficient with LHM prism inside (d).

Image of FIG. 46.
FIG. 46.

The structure formed by bilayers: InSb semiconductor/ferrite with various ferrite layer thickness d 1 (a); the fine stratified structure of manganite-perovskite (b).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Microwaves in dispersive magnetic composite media (Review Article)