Cylindrical superlens by a coordinate transformation

Yan, Min; Yan, Wei; Qiu, Min

doi:10.1103/physrevb.78.125113

Cited by 199 publications

(241 citation statements)

References 23 publications

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“…Interestingly, both have been also shown to obey the same dispersion relation 95 . As we mentioned above the physics underlying the formation of the EM in the present case is similar to the one discussed for the monoatomic nanowires [91][92][93] , and it can not be retrieved in the classical calculations.…”

Section: Optical Response Of Charged Monoatomic Metallic Nanodisksupporting

confidence: 50%

“…This mode is axially symmetric and it is characterized by an antisymmetric charge density distribution induced at the top and bottom surfaces of the nanodisk. Different from the propagating edge plasmons discussed classically 20,[23][24][25]73,95 , the edge mode of the nanodisk found here stems from lateral coordinate dependence of the confining potential and it is similar to the transverse edge mode reported in quantum calculations of the monoatomic wires [91][92][93] For nanodisks negatively charged by electron doping several quantum effects are important:…”

Section: Discussionmentioning

confidence: 81%

“…6b). Similar to the other systems with pronounced quantization effects such as molecules 30 , narrow shells 33,60 , metal slabs 34 or monoatomic wires [91][92][93] , in this polarization direction the optical response reflects transitions between the occupied and unoccupied KS orbitals derived by the zquantization of the electron motion. Obviously, such a situation involves a strong quantum character and cannot be captured within a classical electromagnetic description.…”

Section: Optical Response Of Charged Monoatomic Metallic Nanodiskmentioning

confidence: 99%

“…6c]. The EM arises from the ρ-coordinate dependence of the effective one-electron potential well confining the electron motion in z-direction, as has been discussed for the case of the transversal edge mode found for the monoatomic nanowires 91,92 . Similar to the VM, the EM also posses a dipolar character with induced charge density antisymmetric in z.…”

Section: Optical Response Of Charged Monoatomic Metallic Nanodiskmentioning

confidence: 99%

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Quantum description of the optical response of charged monolayer–thick metallic patch nanoantennas

et al. 2017

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The optical response of small charged metallic nanodisks of one atomic monolayer thickness is analysed under the excitation by an incident plane wave and by a localised point-like dipole. Using the time-dependent density functional theory (TDDFT) and classical electrodynamical calculations we identify the bright and dark plasmon modes and study their evolution under external charging of the nanostructure. For neutral nanodisks, despite their monolayer thickness, the in-plane optical response, as obtained from TDDFT, is in agreement with classical electromagnetic results. The optical response for an incident wave polarised perpendicular to the nanostructure cannot be retrieved classically as it reflects a discrete energy structure of electronic levels. This latter situation appears most sensitive to external charging while the energy of the in-plane plasmon with dipolar character is nearly charge-independent.

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Section: Optical Response Of Charged Monoatomic Metallic Nanodisksupporting

confidence: 50%

Section: Discussionmentioning

confidence: 81%

Section: Optical Response Of Charged Monoatomic Metallic Nanodiskmentioning

confidence: 99%

Section: Optical Response Of Charged Monoatomic Metallic Nanodiskmentioning

confidence: 99%

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Quantum description of the optical response of charged monolayer–thick metallic patch nanoantennas

et al. 2017

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“…DePrince et al showed that plasmon modes emerge from a linear hydrogen atomic chain because the charge density oscillates continuously throughout the system [11]. Plasmon resonance is also observed in noble metal atomic chains in the presence of localized d electrons [12,13]. Nayyar et al recently identified the local plasmonic electron oscillations around dopant atoms in transition-metal-doped gold chains [14].…”

Section: Introductionmentioning

confidence: 99%

Plasmonlike resonances in atomic chains: A time-dependent density-functional theory study

et al. 2014

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We studied plasmonlike resonances in one-dimensional (1D) atomic chain systems by using time-dependent density-functional theory (TDDFT) and local density functional theory. Recent TDDFT studies have shown the coexistence of longitudinal and transverses collective plasmonlike resonances in the atomic chains of simple and noble metals. Such atomic chains contain only a few atoms. The induced polarization occurs along the atomic chain in longitudinal mode and perpendicular to the atomic chain in transverse mode. To understand the emergence of plasmonlike resonance in 1D atomic chains better, we studied carbon chains in which plasmonic resonances are not expected to occur. We used TDDFT to study the emergence of collective resonances in various forms of carbon chains, cumulenes C n H 4 , polyynes C n H 2 , and alkenes C n H n+2 . The excitation energy and dipole oscillation strengths of these systems were determined through TDDFT by using the TURBOMOLE package. We determined how collective plasmonlike resonances arise from single-electron excitations when the number of electrons increases as the carbon chain lengthens. The collective excitation behavior is then compared with that of metallic atomic chains. Our TDDFT results showed longitudinal collective modes for cumulenes and polyynes, as well as for finite-length chains. These collective excitations exhibit the same behavior as that of longitudinal "plasmon" previously identified in sodium and silver chains, although polyynes are gapped in the long chain limit. Such longitudinal excitations are absent in alkenes. However, unlike metal atomic chains, carbon chains exhibited no transverse collective mode. The band structure of periodic atomic chains was calculated by using the standard local density functional method. These structures were used to interpret the results and to relate the single-electron excitation to the collective plasmonlike response. Within the one-particle quantum-well picture, the longitudinal mode in the linear atomic chain arises from intraband transition with q = 1, where q is the quantum number of quantum wells. q = 1 intraband transitions can be found in metallic (e.g., Na) chains and in carbon chains (cumulenes and polyynes), such longitudinal collective mode is rather "generic". Meanwhile, the transverse modes of the sodium chains are attributed to interband transitions with an even q (dominated by q = 0), and such transverse collective excitations only form if the allowed q = 0 transitions occur between bands that are parallel to each other. Such bands can be found in simple metals, but not in carbon chains.

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Illusion Optics: Disguising with Ordinary Dielectric Materials

Liu

Guo

2018

Advanced Materials

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complementary medium by a superlens in order to cancel the scattering of object A, and then to shift another object (B) into the position of object A, therefore, when we detect the scattering pattern we will find that object A appears like object B. TO is a strict method to design illusion devices in theory. However, some restrictions should be noted: (I) Complementary media and superlenses are composed of negative index materials, which require the help of evanescent waves to fulfill the functions of illusion devices. Therefore, in order to ensure the performance of the illusion, the external device (superlens) and the object should be as close as possible (in the near field) to receive adequate evanescent waves. (II) The introduction of negative index materials inevitably makes the device loss sensitive, which is a key factor limiting its performance. (III) The material parameters of the device are very complex, including negative index materials, magnetic materials, anisotropic materials, etc. These are a few of the main reasons why these illusion devices are too difficult to put into real applications.In addition to the method of TO, a new way to artificially manipulate electromagnetic waves has been proposed in 2015 by using spatial Kramers-Kronig (KK) media. [26] This method modifies the scattering potentials in the wave vector domain and makes the scattering potentials zero in the backward direction, that is, no reflections. This method has also been employed to design absorbers and invisibility cloaks. [27][28][29][30] Due to the asymmetrical properties of the scattering potentials, these KK media always require complex materials (with loss or gain). A similar method has been proposed recently to design all-dielectric cloaks, [31] which eliminates two symmetrical areas of scattering potentials in the 2D wave vector domain to make the object invisible within a specified frequency band, and the symmetric conditions ensure that the material has no loss or gain. Besides the above method, some other methods [32,33] for cloaking and illusions are also interesting, for example, characteristic mode method, [34] metasurface method. [35] Our method has several advantages compared with the conventional TO method: first, no external devices are needed in our design because we only slightly modify the scattering potential of the object and the nearby surroundings, which is more of a cosmetic operation for an object; second, no negative refractive index materials are introduced, which is a key factor restricting the effect of the illusion; third, all of the materials are isotropic, nonmagnetic, and with relative permittivity above unity, which makes this method more feasible for real applications of illusion. Now we show the designing method by deducing the relation between the scattering amplitude and the Fourier component of the scattering potential. Considering the 2D case (in

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Cylindrical superlens by a coordinate transformation

Cited by 199 publications

References 23 publications

Quantum description of the optical response of charged monolayer–thick metallic patch nanoantennas

Quantum description of the optical response of charged monolayer–thick metallic patch nanoantennas

Plasmonlike resonances in atomic chains: A time-dependent density-functional theory study

Illusion Optics: Disguising with Ordinary Dielectric Materials

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