Controlling photonic spin Hall effect via exceptional points

Zhou, Xinxing; Lin, Xiao; Xiao, Zhicheng; Low, Tony; Alù, Andrea; Zhang, Baile; Sun, Handong

doi:10.1103/physrevb.100.115429

Cited by 63 publications

(21 citation statements)

References 75 publications

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“…Interaction of light spin and orbital momenta is coined as the spin Hall or Imbert-Fedorov effect and results in a lateral shift of a light beam. Near exceptional points of the PT-symmetric bilayer the reflection coefficient experiences negligible values and abrupt phase shift enhancing the lateral beam displacement, though it takes zero value at the exceptional point [37]. Graphene sheets in PT-symmetric multilayer systems can be used for modulation of an exceptional point position via tuning their surface conductivity [38].…”

Section: Multilayer Structuresmentioning

confidence: 99%

Purcell effect in PT-symmetric waveguides

Karabchevsky¹,

Novitsky²,

Morozko³

2021

Preprint

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This chapter overviews the principles of the spontaneous emission rate increase, that is the Purcell effect, in relation to the photonic parity-time (PT) symmetry. Being focused on the system of coupled PT-symmetric optical waveguides, we consider behaviors of the Purcell factor in PT-symmetric and broken-PT-symmetric regimes. Surprisingly, exceptional points in a coupled waveguide do not influence on the Purcell factor.

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Section: Multilayer Structuresmentioning

confidence: 99%

Purcell effect in PT-symmetric waveguides

Karabchevsky¹,

Novitsky²,

Morozko³

2021

Preprint

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“…The scattering matrix Ŝ2 is used in most articles on PT symmetry. Diverse phenomena have been described with its help including unidirectional invisibility [15], optical pulling [26], and photonic spin Hall effect [27]. Ambiguity of the definition of the scattering matrix was discussed in several works [14,28].…”

Section: Problem Of the Scattering Matrix Uniquenessmentioning

confidence: 99%

Unambiguous scattering matrix for non-Hermitian systems

et al. 2020

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PT symmetry is a unique platform for light manipulation and versatile use in unidirectional invisibility, lasing, sensing, etc. Broken and unbroken PT -symmetric states in non-Hermitian open systems are described by scattering matrices. A multilayer structure, as a simplest example of the open system, has no certain definition of the scattering matrix, since the output ports can be permuted. The uncertainty in definition of the exceptional points bordering PT -symmetric and PT -symmetry-broken states poses an important problem, because the exceptional points are indispensable in applications as sensing and mode discrimination. Here we derive the proper scattering matrix from the unambiguous relation between the PT -symmetric Hamiltonian and scattering matrix. We reveal that the exceptional points of the scattering matrix with permuted output ports are not related to the PT symmetry breaking. Nevertheless, they can be employed for finding a lasing onset as demonstrated in our time-domain calculations and scattering-matrix pole analysis. Our results are important for various applications of the non-Hermitian systems including encircling exceptional points, coherent perfect absorption, PT -symmetric plasmonics, etc.

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“…Although it was recently developed by Hosten and Kwait [5] that the weak measurements method [6][7][8] is successfully employed to characterize the PSHE shifts, enhancing and controlling PSHE shifts is still an important issue. Many various architectures have been proposed to enhance PSHE shifts, such as different material interfaces [9][10][11][12], optical systems [13][14][15], metasurfaces [16][17][18], photonic crystals [19][20][21][22], metamaterials [23][24][25][26][27][28][29][30][31][32][33], and other systems [34][35][36][37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Controlling photonic spin Hall effect by a symmetric hyperbolic metamaterial waveguide

Gao

Zhang

Guo

2021

Preprint

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We investigate the photonic spin Hall effect (PSHE) in a symmetrical hyperbolic metamaterial (HMM) waveguide, which is constructed as an HMM/metal/HMM sandwich structure. We consider both type {\uppercase\expandafter{\romannumeral 1}} and type {\uppercase\expandafter{\romannumeral 2}} HMM in the study. We confirm that the structure of alternating sub-wavelength of plasma and dielectric or the structure of embedding plasma into a host dielectric matrix can display effective dielectric, effective metal, type {\uppercase\expandafter{\romannumeral 1}} and {\uppercase\expandafter{\romannumeral 2}} HMM under different wavelength ranges and different plasma fill fraction. This enable us to simultaneously realize type {\uppercase\expandafter{\romannumeral 1}} and type {\uppercase\expandafter{\romannumeral 2}} HMM. We show that the reflectivity ration $\vert r_{s}/r_{p} \vert$, directly related to transverse shifts generated by PSHE, greatly depends on the type and the thickness of HMM. Moreover, we find that the horizontal PSHE shifts are enhanced several times, especially in type {\uppercase\expandafter{\romannumeral 1}} structure; while the vertical PSHE shifts are significantly suppressed in both type {\uppercase\expandafter{\romannumeral 1}} and {\uppercase\expandafter{\romannumeral 2}} structure. By making the effect of metal type and thickness analysis, we further show that the impacts of these two factors on PSHE shifts are mainly subject to HMM thickness.

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Controlling photonic spin Hall effect via exceptional points

Cited by 63 publications

References 75 publications

Purcell effect in PT-symmetric waveguides

Purcell effect in PT-symmetric waveguides

Unambiguous scattering matrix for non-Hermitian systems

Controlling photonic spin Hall effect by a symmetric hyperbolic metamaterial waveguide

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