The structure under consideration (h, e are the magnetic and dielectric components of the ac field, H is the static magnetic field).
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.
Shift of stop-bands in the transmission spectra of eight-layered 1D MPC for ordinary and extraordinary waves.
The scheme of experiment.
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).
Scheme of polystyrene-air PC with ferrite “defect” layer.
Experimental spectra of the “defect” mode in the 1D PC with ferrite “defect” layer.
“Defect” mode frequency on the applied magnetic field for 1D PC.
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).
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.
Dependence of the “defect” peak frequency on the external magnetic field.
Scheme of the structure under study.
Experimental spectrum demonstrating the formation of the Tamm peak in the forbidden zone of the MPC for H 0 = 1880 Oe.
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.
The scheme of experiment.
The transmission of adjoining photonic crystals at zero magnetization: experimental data (1); the theoretical evaluation (2).
The dependence of Tamm state frequency fTS on external magnetic field H ex.
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).
Dispersion dependence for the infinite structure.23
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.
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.
Scheme of the structure.
The frequency dependencies of the effective parameters.24
|T|2 as a function of the frequency f for various collision frequencies.24
Transmission spectra of various structures: H 0 = 0 Oe, WBR in RHM (a); H 0 = 6570 Oe, WBR in LHM (b).
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).
The composite structure under study (a) and the transmission spectra of various structures at H = 6570 Oe (b).
Calculated ferrite permeability real part at H = 6570 Oe (a); the character peaks position versus magnetic field (b).
The T-junction waveguide with metamaterial prism: scheme.
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).
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).
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).
The structure under study: scheme (a); overview (b): photonic crystal (PC) (1), La0.775Sr0.225MnO3 specimen (2).
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).
Configuration of the structure under study.
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).
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).
The photo of the test bench (a) and a typical MPC structure between horns and between poles of magnet (b).
The scanning system for the spatial field distribution in PC detecting.
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).
Ferrite/quartz MPC (a); metal/quartz PC (b); axially symmetrical MPC and PC (ferrite/quartz/teflon) (c). Diameter of disks is about ≈ λ.
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).
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.
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.
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).
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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