Pseudochirality at exceptional rings of optical metasurfaces

Kołkowski, Radosław; Kovaios, Stefanos; Koenderink, A. Femius

doi:10.1103/physrevresearch.3.023185

Cited by 14 publications

(12 citation statements)

References 104 publications

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“…For example, non-Hermitian topological photonic systems are attracting more and more interests of researchers. [383][384][385][386][387][388][389][390][391][392] The combination of non-Hermitian and topological physics inspires the observation of intriguing phenomena and practical applications. For another example, the real-space lattice defects in topological systems have also inspired the interests of researchers recently.…”

Section: Discussionmentioning

confidence: 99%

Topological Photonic Crystals: Physics, Designs, and Applications

Tang

Shi

et al. 2022

Laser & Photonics Reviews

188

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Recent research in topological photonics has not only proposed and realized novel topological phenomena such as one-way broadband propagation and robust transport of light, but also designed and fabricated photonic devices with high-performance indexes, which are immune to fabrication errors such as defects or disorders. Photonic crystals, which are periodic optical structures with the advantages of good light field confinement and multiple adjusting degrees of freedom, provide a powerful platform to control the flow of light. With the topology defined in the reciprocal space, photonic crystals have been widely used to reveal different topological phases of light and demonstrate topological photonic functionalities. This review presents the physics of topological photonic crystals with different dimensions, models, and topological phases. The design methods of topological photonic crystals are introduced. Furthermore, the applications of topological photonic crystals in passive and active photonics are reviewed. These studies pave the way for applying topological photonic crystals in practical photonic devices.

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Section: Discussionmentioning

confidence: 99%

Topological Photonic Crystals: Physics, Designs, and Applications

Tang

Shi

et al. 2022

Laser & Photonics Reviews

188

View full text Add to dashboard Cite

show abstract

“…For example, when active and passive core−shell plasmonic particles are arranged in a honeycomb-like lattice in two dimensions, normal modes still exist even though the system is open and the so-called exceptional rings, a non-Hermitian extension of Dirac cones, arise as shown in Figure 10b. 150 It is proposed that nonunitary circular dichroism occurs at an oblique incidence in such a system. The transmission (absorption or amplification) of the incoming CP light is dependent on the incident direction and the handedness of the wave, resulting from the coupling to the spin-polarized flat bands associated with these exceptional rings.…”

Section: ■ Nonlinear Metasurfacesmentioning

confidence: 99%

“…Nanoparticles A and B in the unit cell have shells with different gain coefficients. Crosscut of the momentum space at ℏω = 2.586 75 eV captures the flat bands (magenta color) associated with exceptional rings (yellow contours) . Reprinted with permission from ref .…”

Section: Non-hermitian Metasurfacesmentioning

confidence: 99%

“…Crosscut of the momentum space at ℏω = 2.586 75 eV captures the flat bands (magenta color) associated with exceptional rings (yellow contours) . Reprinted with permission from ref . Copyright 2021 American Physical Society.…”

Section: Non-hermitian Metasurfacesmentioning

confidence: 99%

“…It allows a lot of open questions in non-Hermitian topology to be explored. For example, when active and passive core–shell plasmonic particles are arranged in a honeycomb-like lattice in two dimensions, normal modes still exist even though the system is open and the so-called exceptional rings, a non-Hermitian extension of Dirac cones, arise as shown in Figure b . It is proposed that nonunitary circular dichroism occurs at an oblique incidence in such a system.…”

Section: Non-hermitian Metasurfacesmentioning

confidence: 99%

See 2 more Smart Citations

Emerging Trend in Unconventional Metasurfaces: From Nonlinear, Non-Hermitian to Nonclassical Metasurfaces

Fan

Liang

et al. 2022

ACS Photonics

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Metasurfaces, benefiting from the flexibility in engineering the resonance, near-field, symmetry, and scattering properties of individual building blocks, are promising not only for a wide range of practical applications in the classical linear optical regime, but also facilitate research into new unconventional areas. Very recently, we have been witnessing the second quantum revolution in which quantum information processing and computation are becoming a reality. In this review, we will focus on some of the emerging developments of metasurfaces that work in the nonlinear, non-Hermitian, nonclassical, or quantum regime. We review some of the common principles shared by the development of these metasurfaces, including local field enhancement and the consideration of structure, lattice, and time-reversal symmetries.

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Reconfigurable Photonic Lattices Based on Atomic Coherence

Yuan,

Liang,

et al. 2024

Advanced Physics Research

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The array of coupled optical waveguides, which is also viewed as a photonic lattice, can exhibit abundant photonic band structures depending on the desired spatial arrangements of involved waveguides. Studies of photonic lattices are usually performed in solid‐state materials, where the required periodic susceptibilities can be achieved by employing the femtosecond laser direct‐writing or optical induction method, and have spawned flourishing achievements in manipulating the behaviors of light. Recently, the concept of electromagnetically induced photonic lattice (EIPL) is proposed under the well‐known electromagnetically induced transparency (EIT) in coherently prepared multilevel alkali‐metal atomic systems, where the strong coupling beams producing EIT possess spatially periodic intensity profiles. The inherited instantaneous tunability of susceptibility from EIT‐modulated atomic coherence allows for the easy reconfigurability of EIPLs, which gives rise to exotic beam dynamics under such a readily controllable framework. This paper summarizes the historical overview and recent advances of the in situ and all‐optically reconfigurable EIPLs. The Introduction section provides the scheme and formation of the EIPL via atomic coherence. The following sections review the recently demonstrated dynamical properties of light in various 1D and 2D EIPLs and in compound EIPLs built by two coupling fields. The final section gives brief concluding remarks.

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Pseudochirality at exceptional rings of optical metasurfaces

Cited by 14 publications

References 104 publications

Topological Photonic Crystals: Physics, Designs, and Applications

Topological Photonic Crystals: Physics, Designs, and Applications

Emerging Trend in Unconventional Metasurfaces: From Nonlinear, Non-Hermitian to Nonclassical Metasurfaces

Reconfigurable Photonic Lattices Based on Atomic Coherence

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