Enhanced spin Hall effect of reflected light due to optical Tamm states with Dirac semimetal at the terahertz range

Yin, Keqiang; Li, Luzihao; Ma, Qijun; Jiang, Jie; Jiang, Leyong

doi:10.1016/j.optcom.2022.128468

Cited by 8 publications

(6 citation statements)

References 31 publications

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“…Despite their unique optical properties, the theoretical PSHE investigations of 3DDS-based structures are rare and have been limited to a few cases. For example, Yin et al discussed the enhanced PSHE in a Bragg reflector consisting of 3DDS, a space layer, and a onedimensional photonic crystal, which was caused by the excitation of the optical Tamm states [22]. Song et al proposed a symmetrical structure containing 3DDS and found that this structure also supports the enhanced PSHE because of the excitation of the surface plasmon resonance in the 3DDS material [23].…”

Section: Introductionmentioning

confidence: 99%

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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%

“… in other words, the refractive indexes of Loss and Gain materials are conjugate to each other [22]. For example, Feng et al realized the chip-scale unidirectional reflectionless optical metamaterials near the spontaneous parity-time symmetry phase transition point, where the reflection from one side is significantly suppressed [27].…”

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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“…Lu et al investigated optical Tamm states in hetero-structures with highly dispersive planar plasmonic metamaterials to show the EIR-like effect. In the search for new plasmonic materials, bulk Dirac semimetals (BDS) are becoming more significant due to their ultrahigh carrier mobility and tunable conductivity [15,[22][23][24]. The control over Fermi energy and relative permittivity make it a suitable plasmonic material for photonic applications [25].…”

Section: Introductionmentioning

confidence: 99%

Topologically originated optical analog of electromagnetically induced reflectance in Dirac semi-metal based photonic structure

C H,

Mathew,

Mathew

2023

J. Phys. D: Appl. Phys.

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The optical analog of the electromagnetically induced reflectance (EIR) effect was theoretically studied in an active topological photonic structure comprising Dirac semi-metal and topological photonic crystal. The destructive interference between the optical Tamm state and topological edge state results in an induced reflection. It was known that the EIR-like effect occurs in a system having a radiative state and a metastable state. Topological protection is used here to achieve a metastable state, so an effective design of the EIR-like effect was possible. The observed EIR-like effect was modeled as a coupled oscillator system. The use of bulk Dirac semi-metal makes this an active photonic system at terahertz frequencies where the Fermi energy can act as a tunable and controlling parameter through which the induced transparency can be varied.

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“…Considering the similarity between monolayer graphene and 3DDSs, it is natural to ask how the PSHE performs in the structures with 3DDSs. Yin et al have obtained the enhanced PSHE of the reflected beam by merging 3DDS film into a Bragg reflector due to the excited optical tamm state [18]. Nevertheless, quite few works were reported on the PSHE of the transmitted beam in 3DDS-based nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Enhanced photonic spin Hall effect in Dirac semimetal metamaterial enabled by zero effective permittivity

Song

et al. 2022

Nanotechnology

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With the recent discovery of three dimensional Dirac semimetals, their integrations with the optoelectronic devices allow the novel optical effects and functionalities. Here, we theoretically report the photonic spin Hall effect in a periodic structure, where three dimensional Dirac semimetals and the dielectric materials are assembled into the stack. The incident angle and frequency dependent spin shift spectrum reveals that the spin shifts of the transmitted wave in this structure emerge the obvious peaks and valleys for the horizontal polarized wave and their magnitudes and positions display a distinct dependence on the incident angle around the specific frequency. These observations originate from its zero value of the effective perpendicular permittivity and its greatly reduced transmission in the multilayered structure, whose mechanism is different from those in the previous works. Moreover, both the peaks and valleys of the transmitted spin shift are significantly sensitive to the Fermi energy of three dimensional Dirac semimetals, whose magnitudes and positions can be tuned by varying it. Our results highlight the vital role of three dimensional Dirac semimetals in their applications of the spin photonic devices and pave the way to explore the tunable photonic spin Hall effect by engineering their Fermi energies.

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Enhanced spin Hall effect of reflected light due to optical Tamm states with Dirac semimetal at the terahertz range

Cited by 8 publications

References 31 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

Topologically originated optical analog of electromagnetically induced reflectance in Dirac semi-metal based photonic structure

Enhanced photonic spin Hall effect in Dirac semimetal metamaterial enabled by zero effective permittivity

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