Energy, momentum and mass transfer by an electromagnetic wave in a negative refraction medium

2009 ◽  
Vol 179 (6) ◽  
pp. 689 ◽  
Author(s):  
Viktor G. Veselago
Keyword(s):  
Mass Transfer ◽  
Electromagnetic Wave ◽  
Negative Refraction

Контроль электрофизических параметров метаматериалов методом поверхностных электромагнитных волн

2021 ◽  
pp. 51-67
Author(s):  
А.И. Казьмин ◽  
П.А. Федюнин
Keyword(s):  
Inverse Problem ◽  
Electromagnetic Wave ◽  
Radio Wave ◽  
Local Control ◽  
Negative Refraction ◽  
Test Sample ◽  
Experimental Investigations ◽  
Surface Electromagnetic Wave ◽  
New Radio ◽  
Electrophysical Parameters

Development of metamaterials has led to the search and choice of effective methods of radio-wave nondestructive testing of their electrophysical parameters. The existing approaches to testing based on extracted of effective electrophysical parameters of metamaterials from the coefficients of reflection and transmission of an electromagnetic wave have low reliability and don't provide their local control. We present the new radio-wave method of local control of complex dielectric permittivity and magnetic permeability, as well as the thickness of metamaterial plate on a metal substrate with surface microwaves. The method is based on the solution of inverse problem in the determination of effective electrophysical parameters of metamaterial from the frequency dependence of the attenuation coefficient of the field of a slow surface electromagnetic wave excited in a test sample. The electrophysical parameters of the metamaterial are represented as parametric frequency functions in accordance with the Drude-Lorentz models of dispersion, and the solution of the inverse problem is reduced to minimizing the objective function constructed based on the discrepancy between the experimental and design theoretical values of the attenuation coefficients of surface electromagnetic wave fields on a grid of discrete frequencies. The structure of a measuring complex that implements the proposed method of control is proposed. For the numerical and experimental verification of the method, a sample of a metamaterial plate based on SRR elements with a negative refraction region in the frequency band 10.06–10.64 GHz was investigated. Experimental investigations of the metamaterial demonstrated the theoretical capabilities gained with measurement of the local electrophysical parameters with relative error not greater 10 %.

scholarly journals Electromagnetic Wave Scattering from a Moving Medium with Stationary Interface across the Interluminal Regime

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 202
Author(s):  
Zoé-Lise Deck-Léger ◽  
Xuezhi Zheng ◽  
Christophe Caloz
Keyword(s):  
Electromagnetic Wave ◽  
Wave Scattering ◽  
Negative Refraction ◽  
Current Knowledge ◽  
Moving Medium ◽  
Refraction Angle ◽  
Electromagnetic Wave Scattering ◽  
Transmitted Waves ◽  
Stationary Interface ◽  
Moving Media

This paper extends current knowledge on electromagnetic wave scattering from bounded moving media in several regards. First, it complements the usual dispersion relation of moving media, ω(θk) (θk: phase velocity direction, associated with the wave vector, k), with the equally important impedance relation, η(θS) (θS: group velocity direction, associated with the Poynting vector, S). Second, it explains the interluminal-regime phenomenon of double-downstream wave transmission across a stationary interface between a regular medium and the moving medium, assuming motion perpendicular to the interface, and shows that the related waves are symmetric in terms of the energy refraction angle, while being asymmetric in terms of the phase refraction angle, with one of the waves subject to negative refraction, and shows that the wave impedances of the two transmitted waves are equal. Third, it generalizes the problem to the case where the medium moves obliquely with respect to the interface. Finally, it highlights the connection between this problem and a spacetime modulated medium.

Anomalous Optical Transmission Phenomena in Photonic Crystals

2013 ◽  
Vol 320 ◽  
pp. 128-132
Author(s):  
Guo Yan Dong ◽  
Ji Zhou
Keyword(s):  
Electromagnetic Wave ◽  
Photonic Crystals ◽  
Optical Transmission ◽  
Electromagnetic Wave Propagation ◽  
Negative Refraction ◽  
Optical Devices ◽  
Honeycomb Lattice ◽  
Equal Frequency ◽  
Left Handed ◽  
New Type

Anomalous optical transmission phenomena have ever been discovered in various metamaterials, which can be modulated more easily in Photonic crystals (PhCs). Compared with the regular PhCs composed of round rods closely packed in air, the equal frequency contours (EFC) of honeycomb lattice PhCs constituted by trigonal rods are more rounded and more suitable to realize the all-angle left-handed negative refraction (AALNR) in the low band region. Due to the hex EFC distribution, the regular PhC can be applied in the optical collimator design. In the higher band regions, the more complicated refraction behaviors can be excited based on the intricate undulation of one band or the overlap of different bands in PhCs. These unique features will provide us with more understanding of electromagnetic wave propagation in PhCs and give important guideline for the design of new type optical devices.

COMPARISONS OF NEGATIVE REFRACTION IN LEFT-HANDED MATERIALS AND PHOTONIC CRYSTALS

2005 ◽  
Vol 19 (23) ◽  
pp. 3547-3561
Author(s):  
LIANG FENG ◽  
XIAO-PING LIU ◽  
JIE REN ◽  
YAN-FENG CHEN ◽  
YONG-YUAN ZHU
Keyword(s):  
Refractive Index ◽  
Electromagnetic Wave ◽  
Photonic Crystals ◽  
Negative Refraction ◽  
Positive Phase ◽  
Negative Phase ◽  
Negative Group ◽  
Perfect Lens ◽  
Left Handed ◽  
Negative Refractions

Using the equifrequency surfaces (EFS) to describe negative refractions in left-handed materials (LHMs) and photonic crystals (PCs), negative phase and negative group refractive indexes in LHMs were compared with positive phase and negative group refractive indexes in PCs. The refractive indexes in PCs were dependent on frequencies and incident angles of electromagnetic wave, while indexes in LHMs were constant in the left-handed region. Furthermore, the phase compensating effect resulting from the negative phase refractive index was addressed to distinguish the perfect lens made of LHMs from the superlens realized in the all angle negative refraction (AANR) region of PCs.

Metamaterials

2021 ◽  
pp. 114-124
Author(s):  
Adrian P Sutton
Keyword(s):  
Electromagnetic Wave ◽  
Strong Coupling ◽  
Incident Wave ◽  
Seismic Waves ◽  
Negative Refraction ◽  
Ocean Waves ◽  
Transformation Optics ◽  
Coastal Regions ◽  
Structural Units ◽  
Electromagnetic Metamaterials

Metamaterials are composites that have extended the concept of a material. They derive their properties from strong coupling between carefully designed and positioned structural units within them and an incident elastic or electromagnetic wave. They are paragons of materials design. In certain frequency ranges of the incident wave they may display properties that no other materials have ever shown, such as negative refraction. First, an elastic metamaterial demonstrates the principle. Electromagnetic metamaterials have been designed using transformation optics to cloak an object and make it invisible in a certain range of frequencies. The concept of metamaterials has been applied to protect cities and coastal regions from seismic waves and ocean waves.

Modulation of Optical Transmission in Photonic Crystal

2013 ◽  
Vol 538 ◽  
pp. 42-45
Author(s):  
Guo Yan Dong ◽  
Ji Zhou
Keyword(s):  
Electromagnetic Wave ◽  
Photonic Crystal ◽  
Optical Transmission ◽  
Electromagnetic Wave Propagation ◽  
Negative Refraction ◽  
Optical Devices ◽  
Equal Frequency ◽  
Special Effects ◽  
Optical Effects ◽  
New Type

The transmission properties of electromagnetic wave (EMW) can be modulated by the periodic structure of photonic crystal (PhC) to bring many novel optical effects. The special distributions of equal frequency contours (EFCs) can be used to control the wavefront state and transmission direction of propagating wave in PhC with some special effects, such as non-handed refraction. Based on the intricate undulation of one single band or the overlap of different bands, the phenomena of dual-negative refraction, symmetrical positive-negative refraction and triple refraction have been achieved in the higher band regions. These unique features will provide us with more understanding of electromagnetic wave propagation in PhCs and give important guideline for the design of new type optical devices.

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