Focusing by a Cylindrical Plano Convex Lens of Chiral Medium

Ghaffar, Abdul

doi:10.1163/156939311794827230

Cited by 9 publications

(4 citation statements)

References 17 publications

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“…A survey of state of the art indicates that an explosion of activities and efforts, both theoretical and experimental, have been devoted to overcome these limits, namely designing super lenses with better resolution. To date, several techniques are available, e.g., lenses fabricated by using left‐handed (LH) bulk materials with negative refractive index (NRI), LH transmission‐line (TL) materials, photonic crystals, gradient‐index materials, chiral medium, biocompatible material, complementary V‐shaped antennas, near‐field plate, acoustic metamaterial, perovskites, silver film or layer, dielectric elastomers and even based on compensation mechanism . Moreover, the progress of super lenses has been extended significantly from the original gigahertz (GHz) region to terahertz and even optical frequencies via the excitation of surface plasmons.…”

Section: Introductionmentioning

confidence: 99%

Three‐Dimensional Super Lens Composed of Fractal Left‐Handed Materials

Wang

et al. 2013

Advanced Optical Materials

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The lens which can focus electromagnetic (EM) waves below the wavelength represents one of the most fundamental building blocks in the optical microscopy. However, the spatial resolution of conventional lenses is commonly confi ned to half of the illuminating wavelength due to the diffraction limits. A survey of state of the art indicates that an explosion of activities and efforts, both theoretical and experimental, have been devoted to overcome these limits, namely designing super lenses with better resolution. To date, several techniques are available, e.g., lenses fabricated by using left-handed (LH) bulk materials with negative refractive index (NRI), [1][2][3][4][5][6][7][8] LH transmission-line (TL) materials, [9][10][11][12][13][14][15][16][17][18][19][20] photonic crystals, [ 21 ] gradient-index materials, [22][23][24] chiral medium, [ 25,26 ] biocompatible material, [ 27 ] complementary V-shaped antennas, [ 28 ] near-fi eld plate, [ 29 ] acoustic metamaterial, [ 30 ] perovskites, [ 31 ] silver fi lm or layer, [32][33][34] dielectric elastomers [ 35 ] and even based on compensation mechanism. [ 36 ] Moreover, the progress of super lenses has been extended significantly from the original gigahertz (GHz) region to terahertz and even optical frequencies [32][33][34]37 ] via the excitation of surface plasmons.Among them, the LH material (LHM) lens, also termed as Veselago-Pendry lens, [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] has intrigued an enormous and long-holding interest in science and engineering communities since Veselago and Pendry predicted in their seminal work [ 1,2 ] that lens made of LHM slab is able to overcome the conventional diffraction limits. This is especially true for the representative LH-TL lenses due to their low loss and small volume, because the lossy and thick LHM drastically deteriorates the evanescent-wave enhancement which contributes much to the sub-diffraction imaging. The physical mechanism for super resolution is that the LHM lens is not only capable of focusing the propagating waves emanating from the sources but also of amplifying the evanescent waves which restore useful information of sources and decay exponentially in vacuum. [ 10 ] However, the subwavelength imaging is achieved only when some strict requirements are fulfi lled. First, specifi c material parameters are required with the permeability μ eff = − μ 0 and permittivity ε eff = − ε 0 at the focusing frequency in order to make the matched impedance Z = Z 0 and refractive index n eff = −1, where Z 0 is the intrinsic impedance of the free space and μ 0 and ε 0 are the permeability and permittivity in free space. Second, electrically small dimensions of basic elements are required. Third, appropriate position for the focal spot and suffi ciently large transverse dimensions are required in addition to the aforementioned low loss and thin thickness.Although the LH-TL lenses are able to provide a decent resolution, most of them are restricted to the planar TLs which are constructed by peri...

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Section: Introductionmentioning

confidence: 99%

Three‐Dimensional Super Lens Composed of Fractal Left‐Handed Materials

Wang

et al. 2013

Advanced Optical Materials

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“…Maslov's method is a combination of asymptotic ray theory (ART) and Fourier transform method. This technique has been used to study analysis of high frequency field in focal region succesfully by many authors [21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Analysis of electromagnetic field transmitted by a quadratic inhomogeneous slab composed of chiral medium

Ghaffar

Ahmad

Naqvi

2013

International Journal of Applied Electromagnetics and Mechanics

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A theoretical investigation has been carried out to analyze the transmission of electromagnetic field through a slab of quadric inhomogeneous chiral medium. The transmission coefficients at dielectric-chiral and chiral-dielectric interfaces are derived analytically. The transmitted electromagnetic field expressions have been obtained using Maslov's method. The derived analytical field expressions at caustic or focal point of quadratic inhomogeneous chiral slab have been solved numerically using MATHEMATICA. The result obtained using Maslov's method are compared with Hyugen Kirchhoff's integral which are in good agreement.

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“…To simplify the notations, scalars, vectors, and dyadics are represented by italic, italic bold , and non-italic bold letters, respectively. Based on these constructive relations, bi-anisotropic media, incorporating large variety of media, such as anisotropic media, gyrotropic media, chiral and bi-isotropic media, have been found to have various applications in microwave and antenna engineering [6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Scattering From Inhomogeneous Planar Layered Media Using Notation of Propagators

Nayyeri

Zarifi

Soleimani

2012

Journal of Electromagnetic Waves and Applications

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In this paper, the reflection and transmission of an electromagnetic plane wave from (through) planar layered of inhomogeneous bi-anisotropic media are considered. Inhomogeneous layers are decomposed into thin homogeneous sub-layers, and the method of propagators is used for analysis of the wave interaction with planar multi-layered of homogenous bi-anisotropic media. The most interesting property of the presented method is its systematic approach. Finally, the validity of the method is verified by considering some special types of bi-anisotropic media and comparing the obtained results from the presented method with the other reported methods.

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Focusing by a Cylindrical Plano Convex Lens of Chiral Medium

Cited by 9 publications

References 17 publications

Three‐Dimensional Super Lens Composed of Fractal Left‐Handed Materials

Three‐Dimensional Super Lens Composed of Fractal Left‐Handed Materials

Analysis of electromagnetic field transmitted by a quadratic inhomogeneous slab composed of chiral medium

Electromagnetic Scattering From Inhomogeneous Planar Layered Media Using Notation of Propagators

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