Realization of a complementary medium using dielectric photonic crystals

Xu, Tao; Fang, Anan; Jia, Ziyuan; Ji, Liyu; Hang, Zhi Hong

doi:10.1364/ol.42.004909

“…Pseudospin-1 photonic system is hence a good candidate since the PCs are all dielectric so that they have low loss even at high frequencies. Recently, experimental realization of complementary materials has been demonstrated in the microwave regime using PCs composed of alumina ( ε = 8.1) rods in air [62, 63]. It looks promising to push the working frequency to the optical regime in the near future.…”

Section: Transport Properties Of Pseudospin-1 Waves In 1d Potentialsmentioning

confidence: 99%

Pseudospin-1 Physics of Photonic Crystals

Fang

¹

,

Zhang

²

,

Louie

³

et al. 2019

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We review some recent progress in the exploration of pseudospin-1 physics using dielectric photonic crystals (PCs). We show some physical implications of the PCs exhibiting an accidental degeneracy induced conical dispersion at the Γ point, such as the realization of zero refractive index medium and the zero Berry phase of a loop around the nodal point. The photonic states of such PCs near the Dirac-like point can be described by an effective spin-orbit Hamiltonian of pseudospin-1. The wave propagation in the positive, negative, and zero index media can be unified within a framework of pseudospin-1 description. A scale change in PCs results in a rigid band shift of the Dirac-like cone, allowing for the manipulation of waves in pseudospin-1 systems in much the same way as applying a gate voltage in pseudospin-1/2 graphene. The transport of waves in pseudospin-1 systems exhibits many interesting phenomena, including super Klein tunneling, robust supercollimation, and unconventional Anderson localization. The transport properties of pseudospin-1 systems are distinct from their counterparts in pseudospin-1/2 systems, which will also be presented for comparison.

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“…Pseudospin-1 photonic system is hence a good candidate since the PCs are all dielectric so that they have low loss even at high frequencies. Recently, experimental realization of complementary materials has been demonstrated in the microwave regime using PCs composed of alumina ( = 8.1) rods in air [62,63]. It looks promising to push the working frequency to the optical regime in the near future.…”

Section: Transport Properties Of Pseudospin-1mentioning

confidence: 99%

Pseudospin-1 Physics of Photonic Crystals

Fang

¹

,

Zhang

²

,

Louie

³

et al. 2019

View full text Add to dashboard Cite

We review some recent progress in the exploration of pseudospin-1 physics using dielectric photonic crystals (PCs). We show some physical implications of the PCs exhibiting an accidental degeneracy induced conical dispersion at the Γ point, such as the realization of zero refractive index medium and the zero Berry phase of a loop around the nodal point. The photonic states of such PCs near the Dirac-like point can be described by an effective spin-orbit Hamiltonian of pseudospin-1. The wave propagation in the positive, negative, and zero index media can be unified within a framework of pseudospin-1 description. A scale change in PCs results in a rigid band shift of the Dirac-like cone, allowing for the manipulation of waves in pseudospin-1 systems in much the same way as applying a gate voltage in pseudospin-1/2 graphene. The transport of waves in pseudospin-1 systems exhibits many interesting phenomena, including super Klein tunneling, robust supercollimation, and unconventional Anderson localization. The transport properties of pseudospin-1 systems are distinct from their counterparts in pseudospin-1/2 systems, which will also be presented for comparison.

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“…Yet, the experimental implementations of those concepts have remained relatively limited so far. Many attempts have been proposed 5 – 15 to build artificial media, such as photonic/phononic crystals or metamaterials, which can be described by a negative index material. However, these man made media first suffer from the inherent periodicity which imposes a limitation on the negative refracting lens resolution 16 .…”

Section: Introductionmentioning

confidence: 99%

Cloaking, trapping and superlensing of lamb waves with negative refraction

Legrand

¹

,

Gérardin

²

,

Bart

³

et al. 2021

Sci Rep

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We report on experimental and numerical implementations of devices based on the negative refraction of elastic guided waves, the so-called Lamb waves. Consisting in plates of varying thickness, these devices rely on the concept of complementary media, where a particular layout of negative index media can cloak an object with its anti-object or trap waves around a negative corner. The diffraction cancellation operated by negative refraction is investigated by means of laser ultrasound experiments. However, unlike original theoretical predictions, these intriguing wave phenomena remain, nevertheless, limited to the propagating component of the wave-field. To go beyond the diffraction limit, negative refraction is combined with the concept of metalens, a device converting the evanescent components of an object into propagating waves. The transport of an evanescent wave-field is then possible from an object plane to a far-field imaging plane. Twenty years after Pendry’s initial proposal, this work thus paves the way towards an elastic superlens.

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Realization of a complementary medium using dielectric photonic crystals

Cited by 9 publications

References 18 publications

Pseudospin-1 Physics of Photonic Crystals

Pseudospin-1 Physics of Photonic Crystals

Pseudospin-1 Physics of Photonic Crystals

Cloaking, trapping and superlensing of lamb waves with negative refraction

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