Wide-range electrically tunable photonic spin Hall effect in a quasi-PT-symmetric structure

Yang, Jian; Yuan, Shuaijie; Li, Qianyang; Chen, Yu; Zhou, Xinxing

doi:10.1364/ol.472312

Cited by 8 publications

(3 citation statements)

References 40 publications

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“…To solve this issue, Yang et al proposed a quasi-PT-symmetric structure (air-Loss/Gain-monolayer graphene-Gain/Loss-air) and investigated its PSHE. They found that the magnitude of the PSHE can be enhanced to l 14.5 and it can be controlled either by changing the Fermi energy of monolayer graphene or the imaginary part of the Loss/Gain medium [32]. Despite this work, it remains an open question how to manipulate the PSHEs in the PT symmetric structures with an external stimulus.…”

Section: Introductionmentioning

confidence: 99%

Giant and tunable photonic spin Hall effect in a parity-time symmetric structure with a Dirac semimetal material

Qi,

Da,

Yan

2024

Phys. Scr.

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The optical parity-time (PT) symmetry structure can yield unique properties, including periodicity, discreteness, nonlinearity, and so on. However, the component materials in these PT symmetry structures have been primarily restricted by their lack of tunability. Here, by utilizing the external stimulus-dependent optical properties of the Dirac semimetal, we report the theoretical prediction of the large and controllable photonic spin Hall effect in the PT symmetry structure with the slab of the Dirac semimetal. We provide evidence that the PT symmetry structure with the Dirac semimetal exhibits a large spin shift as high as the half of the waist at a certain incident angle, which is the conventionally theoretical upper limit. Due to the combination of and , the spin shift can be enhanced effectively. Furthermore, we unravel that a small change in the Fermi energy of the Dirac semimetal on the order of 0.01 eV is able to engineer both the magnitude and sign of the spin shift. In particular, there is a transition in the spectrum of the spin shift when we vary the Fermi energy of the Dirac semimetal, where the number of the spin shift peak changes from one to two. Our results reveal the interplay between the light and the PT symmetry structure with the Dirac semimetal, which offers the possibility of developing Dirac semimetal-based spin-dependent photonic devices.

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Section: Introductionmentioning

confidence: 99%

Giant and tunable photonic spin Hall effect in a parity-time symmetric structure with a Dirac semimetal material

Qi,

Da,

Yan

2024

Phys. Scr.

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show abstract

“…Additionally, non-Hermitian optical systems, by adjusting their geometric and material parameters, can also effectively manipulate the PSHE [35][36][37][38][39][40]. Particularly, systems that exhibit parity-time (PT) symmetry serve as powerful tools for manipulating PSHE [35,36,39,41,42]. Moreover, systems with PT symmetry that incorporate chiral metamaterials [43][44][45][46], known as chiral PT-symmetric systems, can offer more methods for manipulating the PSHE and TPT.…”

Section: Introductionmentioning

confidence: 99%

Chirality-enabled topological phase transitions in parity-time symmetric systems

Cao,

Sheng,

Zhou

et al. 2024

New J. Phys.

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Photonic spin Hall effect (PSHE) in chiral PT-symmetric systems exhibits many exotic features, but the underlying physical mechanism has not been well elucidated. Here, through rigorous calculations based on full-wave theory, we reveal the physical mechanism of the exotic PSHE and identify a chirality-enabled topological phase transition. When circularly polarized light is incident on a chiral PT-symmetric system, the transmitted beam contains two components: a spin-flipped abnormal mode that acquires a geometric phase (exhibiting a vortex or a spin-Hall shift), and a spin-maintained normal mode that does not exhibit such a phase. If the phase difference between the cross-polarized Fresnel coefficients cannot be ignored, it results in a chirality-enabled phase and intensity distribution in the abnormal mode, which induces an exotic PSHE. Consequently, as the incident angle increases, a chirality-induced topological phase transition occurs, namely the transition from the vortex generation to the exotic PSHE. Finally, we confirm that the asymmetric and periodic PSHE in the chiral slab is also related to the phase difference between the cross-polarized Fresnel coefficients. These concepts and findings also provide an opportunity for unifying the phenomena of topological phase transitions in various spin-orbit photonic systems.

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“…Back in 2011, Qin et al proposed a method for measuring the amplified LSS after the collimation lens using a position-sensitive detector [23]. Many interesting optical phenomena have been discovered in the study of LSS of light [24][25][26][27][28][29]. To deeply reveal the relationship between the LSS and GH shift, it is necessary to revisit the GH shift of arbitrarily polarized light in the spin representation.…”

Section: Introductionmentioning

confidence: 99%

Goos–Hänchen shifts on spin representation

Chen,

Zhang,

Zhang

et al. 2024

New J. Phys.

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We analyze the Goos-Hänchen (GH) shift and longitudinal spin splitting (LSS) at a planar interface between two optical media in the spin representation. While these optical effects have been studied previously, we examine the direct and cross-reflected light fields, and their interference from the spin representation to reveal the physical mechanism of the GH shift and establish a quantitative relationship between it and LSS. Furthermore, we show that angular asymmetric spin splitting occurs under the spin representation when linearly polarized light with a phase difference of 180 degrees and an amplitude ratio angle deviating from 45 degrees impinges on the air-glass interface at Brewster’s angle. Finally, we reveal that the spin component field of the reflected light field for the total reflection case is different from that of the Brewster angle reflection, the most typical manifestation is that the intensity of the two spin component fields is not equal.

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Wide-range electrically tunable photonic spin Hall effect in a quasi-PT-symmetric structure

Cited by 8 publications

References 40 publications

Giant and tunable photonic spin Hall effect in a parity-time symmetric structure with a Dirac semimetal material

Giant and tunable photonic spin Hall effect in a parity-time symmetric structure with a Dirac semimetal material

Chirality-enabled topological phase transitions in parity-time symmetric systems

Goos–Hänchen shifts on spin representation

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