Amplification of evanescent waves in a lossy left-handed material slab

Rao, X. S.; Ong, C. K.

doi:10.1103/physrevb.68.113103

Cited by 96 publications

(62 citation statements)

References 22 publications

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“…At ℑ(δ) = 0.01, the loss becomes so heavy that the first surface mode also weakens. The results shown here are very similar to those noticed for a slab lens [20].…”

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confidence: 80%

Cylindrical superlens by a coordinate transformation

2008

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Cylinder-shaped perfect lens deduced from the coordinate transformation method is proposed.The previously reported perfect slab lens is noticed to be a limiting form of the cylindrical lens when the inner radius approaches infinity with respect to the lens thickness. Connaturality between a cylindrical lens and a slab lens is affirmed by comparing their eigenfield transfer functions. We numerically confirm the subwavelength focusing capability of such a cylindrical lens with consideration of material imperfection. Compared to a slab lens, a cylindrical lens has several advantages, including finiteness in cross-section, and ability in lensing with magnification or demagnification.Immediate applications of such a cylindrical lens can be in high-resolution imaging and lithography technologies. In addition, its invisibility property suggests that it may be valuable for non-invasive electromagnetic probing.

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“…At ℑ(δ) = 0.01, the loss becomes so heavy that the first surface mode also weakens. The results shown here are very similar to those noticed for a slab lens [20].…”

supporting

confidence: 80%

Cylindrical superlens by a coordinate transformation

2008

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“…This research direction was further pushed by works of Pendry and others [4,5,[46][47][48][49][50][51][52][53][54][55][56][57][58] who showed the lens with such NIM (i.e. ǫ = µ = −1 + δ)c o u l db easuperlens whose image resolution can go beyond the usual diffraction limit.…”

Section: The Temporal Coherence Gain Of the Negative-index Superlens mentioning

confidence: 99%

“…And these beyond-limit properties give us new physical pictures and opportunities to design devices. Recently, new numerical [50,51] and theoretical Green's function [52] methods are used to understand the phenomena in such systems. But so far almost all studies are done with the strictly single-frequency sources, so that the coherent properties of EM waves (or photons) in the NIM systems have not been studied to the best of our knowledge.…”

Section: The Temporal Coherence Gain Of the Negative-index Superlens mentioning

confidence: 99%

“…At ω 0 ,wehaveǫ r = µ r = −1.00 − i0.0029. At here, we emphasize that in our FDTD simulation the smallest space-step δ x = λ 0 /20 (λ 0 = 2πc/ω 0 ) and the distance (d/2 = λ 0 ) of the source from the lens are too large to excite strong evanescent modes of NIM [50,51,53]. Actually the evanescent field in our simulation can be neglected comparing with radiating field, and what we are studying is the property dominated by the radiating field.…”

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confidence: 99%

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The Group Velocity Picture of Metamaterial Systems

Jiang¹,

Liu²,

Li³

et al. 2012

Metamaterial

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3www.intechopen.com 2 Will-be-set-by- IN-TECH seriously, the dispersion is related with some very basic limitations of this world, e.g.t h e causality limitation that the group velocity in metamaterial should be less than the vacuum light speed. If our design of devices is based on the metamaterials which violate these basic limitations, the design surely can not work since such metamaterial could not exist in this world. From this view, the group velocity picture is not only needed in understanding and explanation, but also required in research of some topics and design of devices. For instance, in the research of the limitation of the cloak [7,8] and abnormal phenomena on the interface of the hyperbolic metamaterial[9], if we neglect the dispersion of material, from group velocity picture we will immediately find that we have fallen into a superluminal trap, since the energy velocity in such artificial systems is divergent. So, the group velocity picture can help us avoid such traps.As a basic value for revealing the complex propagating process, abnormal group velocity has been studied for decades. In the early 1960's the group velocity in material has been studied by Brillouin[10] and the group velocity in strongly scattering media is investigated by J. H. Page, Ping Sheng et al. in 1996[11], which indicate that the physical origin of the remarkably low velocities of propagation lies in the renormalization of the effective medium by strong resonant scattering. So far, metamaterials generally are composite of "photonic atoms" which can scatter light coherently. And all abnormal properties of metamaterials, e.g. these strange beams, are from these complex coherent scattering. Another byproduct of these scattering is the (abnormal) group velocity. In other words, the strange beam and the abnormal group velocity are two sides of a same coin. Further more, with some abnormal group velocity, such as the extremely slow light, we can design new signal-processing devices or new detecting devices. Hence, exploring the group velocity in metamaterial is very vital for revealing mechanism and the design of the real optical devices.The numerical simulation takes an important role in research for modern photonics. For metamaterial, since the difficulties of experimental realization, the numerical tools become very essential for researchers. But, in some frequency domain simulation softwares, the dispersion is neglected totally. As we discussed above, we think such softwares can misleading researchers to some imaginary metamaterial which can not exist in this world. Such as for cloaking study, these softwares could present perfect invisibility very easily, but from our study [7,8], that is misleading one. We strongly recommend the time-domain softwares, such as finite-difference time-domain (FDTD) method or finite-element time-domain(FETD) method.Their simulating results are much more convincible since they are generally with physical dispersion in the simulation and fit for metamaterial studies. This paper is organized ...

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“…However, other authors have found that the amplification of pure evanescent waves depends not only on losses, but also on the slab thickness. The final consequence could be that superlensing effect can be achieved even under the presence of small absorption [16].…”

Section: Introductionmentioning

confidence: 99%

Photonic Modes in Dispersive and Lossy Superlattices Containing Negative-Index Materials

Kinto-RamÃrez¹,

Palomino-Ovando²,

Ramos-Mendieta³

2011

PIER B

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Abstract-We have calculated the photonic bands of a dispersive and lossy periodic array of left-handed metamaterial layers in air. Depending on the behavior of the fields inside the metamaterial component, two categories of modes for oblique propagation are identified: the oscillatory and the tunneling modes. In order to characterize these two types of solutions, we calculate the complex photonic bands; a criterion of penetration-limit is introduced to quantify the absorption effects. Our results show that oscillatory TE and TM waves can be excited by light incident from air at low frequencies (within the metamaterial regime). In the region of high frequencies only TE tunneling modes are available. To complement the description of the absorption effects, we present transmission spectra and field profiles for TE waves in finite layered systems for the two types of modes here studied.

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Amplification of evanescent waves in a lossy left-handed material slab

Cited by 96 publications

References 22 publications

Cylindrical superlens by a coordinate transformation

Cylindrical superlens by a coordinate transformation

The Group Velocity Picture of Metamaterial Systems

Photonic Modes in Dispersive and Lossy Superlattices Containing Negative-Index Materials

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