Scattering phenomenon of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi mathvariant="script">PT</mml:mi></mml:math>-symmetric dielectric-nanosphere structure

Chen, Xiaolin; Yue, Weisheng; Tao, Runxia; Yao, Peijun; Wen, Li

doi:10.1103/physreva.94.053829

Cited by 11 publications

(4 citation statements)

References 27 publications

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“…The scattering behavior of -symmetric structures becomes more complex in higher dimensions. A basic example of such geometries is a Janus particle with balanced regions of gain and loss [126] or a dimmer of two coupled dielectric spheres with equal gain and loss [138,139].…”

Section: Unconventional Lasing Scenariosmentioning

confidence: 99%

“…, which is found to be [137]: [137,144]. The behavior of symmetric dielectric particles have been also investigated away from the plasmonic resonance [139,145]. It has been shown that similar to the 1D case, here the scattering matrix undergoes a phase transition and becomes non-unitary at a critical gain/loss contrast [146].…”

Section: E R E R G R R Pmentioning

confidence: 99%

“…In both scenarios, the pole-zero cancellation point happens near the plasmonic resonance, i.e., 2 r  =− and reveals the existence of a bound state in continuum (BIC) [137,144]. The behavior of symmetric dielectric particles have been also investigated away from the plasmonic resonance [139,145]. It has been shown that similar to the 1D case, here the scattering matrix undergoes a phase transition and becomes non-unitary at a critical gain/loss contrast [146].…”

Section: -Symmetric Structuresmentioning

confidence: 99%

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Anomalies in light scattering

et al. 2019

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Scattering of electromagnetic waves lies at the heart of most experimental techniques over nearly the entire electromagnetic spectrum, ranging from radio waves to optics and X-rays. Hence, deep insight into the basics of scattering theory and understanding the peculiar features of electromagnetic scattering is necessary for the correct interpretation of experimental data and an understanding of the underlying physics. Recently, a broad spectrum of exotic scattering phenomena attainable in suitably engineered structures has been predicted and demonstrated.Examples include bound states in the continuum, exceptional points in -symmetrical non-Hermitian systems, coherent perfect absorption, virtual perfect absorption, nontrivial lasing, nonradiating sources and cloaking, and others. In this paper, we establish a unified description of such exotic scattering phenomena and show that the origin of all these effects can be traced back to the properties of the underlying scattering matrix. two or three dimensions. Maxwell's equations describing spatial and temporal evolution of electric ( , ) t Er and magnetic ( , ) t Hr fields for an arbitrary system are

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Section: Unconventional Lasing Scenariosmentioning

confidence: 99%

Section: E R E R G R R Pmentioning

confidence: 99%

Section: -Symmetric Structuresmentioning

confidence: 99%

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Anomalies in light scattering

et al. 2019

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“…Metallic nanostructures with engineered optical properties constitute a new platform to tailor light-matter interactions on active materials [12]. Optical nanostructures with hybrid active-passive geometries rely on the balance between gain and loss [13,14] and active-passive nanostructures shed light on important non-Hermitian quantum mechanics. In the optics community, novel applications based on effects such as coherent perfect absorption [15], non-linear switching [16], and asymmetric transmission [17] have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Forward and Backward Unidirectional Scattering by the Core-Shell Nanocube Dimer with Balanced Gain and Loss

Zhang

et al. 2020

Nanomaterials

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An optical nanoantenna consisting of a Au-dielectric core-shell nanocube dimer with switchable directionality was designed and described. Our theoretical model and numerical simulation showed that switching between forward and backward directions can be achieved with balanced gain and loss, using a single element by changing the coefficient κ in the core, which can be defined by the relative phase of the polarizability. The optical response indicated a remarkable dependence on the coefficient κ in the core as well as frequency. The location of the electric field enhancement was specified by the different coefficient κ and, furthermore, the chained optical nanoantenna and coupled electric dipole emitted to the optical nanoantenna played significant roles in unidirectional scattering. This simple method to calculate the feasibility of unidirectional and switchable scattering provides an effective strategy to explore the functionalities of nanophotonic devices.

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Photonic Spin Hall Effect of Nanoparticles: Fundamentals, Advances, and Applications

Khan,

Gu,

Gao

et al. 2024

Annalen der Physik

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The net angular momentum of light remains conserved during propagation. This conservation leads to a spin transport which becomes evident when light encounters a refractive index gradient, i.e., when it is reflected, refracted, or scattered. The phenomenon is so‐called as the spin‐orbit interaction (SOI) of light has paved the way to manipulate the light‐matter interaction at the nanoscale and has remained the core of many recent studies. Particularly, the photonic spin Hall effect (PSHE) of light which is the microscopic spin splitting into circular polarization has given rise to novel applications, for example, precision metrology. The PSHE is well explored at planar interfaces, however much less attention is given to it when the optical potential gradient is of higher dimensionality, i.e., for nanoparticles. In this review, the theoretical description of the PSHE as well as the SOI in the scattering of light from nanoparticles are covered. Recent advances and trends in the PSHE in nanoparticles are reviewed. The review is concluded with suggestions for some novel directions in the field of PSHE of nanoparticles.

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Scattering phenomenon ofPT-symmetric dielectric-nanosphere structure

Cited by 11 publications

References 27 publications

Anomalies in light scattering

Anomalies in light scattering

Forward and Backward Unidirectional Scattering by the Core-Shell Nanocube Dimer with Balanced Gain and Loss

Photonic Spin Hall Effect of Nanoparticles: Fundamentals, Advances, and Applications

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