Negative refraction by photonic crystals

Cubukcu, Ertugrul; Aydın, Koray; Özbay, Ekmel; Foteinopoulou, Stavroula; Soukoulis, Costas M.

doi:10.1038/423604b

Cited by 649 publications

(413 citation statements)

References 7 publications

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“…[1][2][3][4][5][6] By utilizing negative refraction, in which the light will be bent in an unusual way with an angle of refraction negative to the normal direction of the material surface, one may be able to construct a superlens whose resolution is smaller than the light wave length. [2,3,6] A better Cherenkov radiation detector can also be realized based on the material having a negative refractive index, which is useful in the field of accelerator physics. [7,8] However, materials having simultaneous negative ε and µ have not been found in nature so far.…”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11][12] These structures usually contain an array of split ring resonators [6,[13][14][15] or dielectric photonic crystals with periodically modulated ε and µ, [2,6,16] which are often complicated to fabricate. To overcome the difficulties, in this paper we predict that negative refraction can take place in a bulk Weyl semimetal (WSM) even without having negative µ and without constructing complicated structure.…”

Section: Introductionmentioning

confidence: 99%

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Negative Refraction in Weyl Semimetals

Ukhtary

Nugraha

2017

J. Phys. Soc. Jpn.

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We theoretically propose that Weyl semimetals may exhibit negative refraction at some frequencies close to the plasmon frequency, allowing transverse magnetic (TM) electromagnetic waves with frequencies smaller than the plasmon frequency to propagate in the Weyl semimetals. The idea is justified by the calculation of reflection spectra, in which negative refractive index at such frequencies gives physically correct spectra. In this case, a TM electromagnetic wave incident to the surface of the Weyl semimetal will be bent with a negative angle of refraction. We argue that the negative refractive index at the specified frequencies of the electromagnetic wave is required to conserve the energy of the wave, in which the incident energy should propagate away from the point of incidence.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Negative Refraction in Weyl Semimetals

Ukhtary

Nugraha

2017

J. Phys. Soc. Jpn.

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“…Photonic crystals can provide the negative refraction needed for a flat lens, 9 as demonstrated experimentally. 10,11 The electronic analog of a Veselago lens was proposed in the context of graphene 12 based on the negative refraction of an electron crossing from the conduction band into the valence band. Such interband crossing requires a p-n junction, which is highly resistive if the interface extends over more than an electron wavelength.…”

Section: Introductionmentioning

confidence: 99%

Flat-lens focusing of electrons on the surface of a topological insulator

2010

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We propose the implementation of an electronic Veselago lens on the conducting surface of a threedimensional topological insulator ͑such as Bi 2 Te 3 ͒. The negative refraction needed for such a flat lens results from the sign change in the curvature of the Fermi surface, changing from a circular to a snowflakelike shape across a sufficiently large electrostatic potential step. No interband transition ͑as in graphene͒ is needed. For this reason, and because the topological insulator provides protection against backscattering, the potential step is able to focus a broad range of incident angles. We calculate the quantum interference pattern produced by a point source, generalizing the analogous optical calculation to include the effect of a noncircular Fermi surface ͑having a nonzero conic constant͒.

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“…Recently, the experimental demonstration of negative refraction in a two-dimensional (2D) PhC working at microwave frequencies has also been reported [11][12]. It should be noticed that it has been reported that negative refraction in PhCs can also occur at frequencies in the first photonic band [13][14][15]. In this case, an effective index of refraction cannot be associated to the PhC since the corresponding EFSs do not become rounded and the observed negative deflection of the beam inside the PhC can be explained by considering that the existence of a pseudogap for one of the two main symmetry directions makes the waves to travel along the allowed direction, which in some cases can be confused with negative refraction [16].…”

Section: Introductionmentioning

confidence: 99%

Analysis of wave propagation in a two-dimensional photonic crystal with negative index of refraction: plane wave decomposition of the Bloch modes

Martı́nez¹,

Míguez²,

Sánchez‐Dehesa³

et al. 2005

Opt. Express

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This work presents a comprehensive analysis of electromagnetic wave propagation inside a two-dimensional photonic crystal in a spectral region in which the crystal behaves as an effective medium to which a negative effective index of refraction can be associated. It is obtained that the main plane wave component of the Bloch mode that propagates inside the photonic crystal has its wave vector ' k out of the first Brillouin zone and it is parallel to the Poynting vector ( 0 ' · > k S ), so light propagation in these composites is different from that reported for left-handed materials despite the fact that negative refraction can take place at the interface between air and both kinds of composites. However, wave coupling at the interfaces is well explained using the reduced wave vector ( k ) in the first Brillouin zone, which is opposed to the energy flow, and agrees well with previous works dealing with negative refraction in photonic crystals.

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Negative refraction by photonic crystals

Cited by 649 publications

References 7 publications

Negative Refraction in Weyl Semimetals

Negative Refraction in Weyl Semimetals

Flat-lens focusing of electrons on the surface of a topological insulator

Analysis of wave propagation in a two-dimensional photonic crystal with negative index of refraction: plane wave decomposition of the Bloch modes

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