Spin-selective thermal radiation with near-perfect circular dichroism in twisted hyperbolic materials

Wu, Biyuan; Wu, Xiaohu; Li, Hongju; Liu, Haotuo; Huang, Xiqiao

doi:10.1016/j.ijthermalsci.2023.108853

Cited by 8 publications

(3 citation statements)

References 59 publications

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Section: Introductionmentioning

confidence: 99%

“…To improve the relatively low circular polarization efficiency and simiplfy the fabrication process, planar anisotropic hyperbolic materials and topological materials have aroused great interest in chiral applications [18,19]. Weyl semimetal (WSM) has attracted multitudinous interests due to its outstanding optical features as a topological material [19,20]. WSM holds a linear dispersion analogous to graphene, thus generating a great deal of prominent optical behaviors, such as controllable plasmon resonance and distinctive optical nonlinearity [21].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tunable and strong circular dichroism mediated with graphene-Weyl semimetal planar scheme

Xu,

Yu,

Qian

et al. 2024

J. Opt.

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Strong circular dichroism (CD) has been observed in Weyl semimetals (WSMs) because of the extremely large gyrotropic optical response. However, traditional proposals cannot tune the wavelength of CD peaks continuously without changing the geometric parameters or external magnetic field, which limits the practical application. This study presents a lithography-free platform exhibits near-unity CD in a WSM-graphene-dielectric structure. It is theoretically shown that the proposal possesses different reflectance properties for right-hand circular polarization (RCP) and left-hand circular polarization (LCP) light in the mid-infrared (mid-IR) range.  The merits of the wide-angular chiral capacity of CP waves can also be maintained. The CD of the chiral structure can be tuned not only by adjusting the structural parameters, but also the chemical potential of graphene, which may also facilitate the design of more efficient chiral optical devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tunable and strong circular dichroism mediated with graphene-Weyl semimetal planar scheme

Xu,

Yu,

Qian

et al. 2024

J. Opt.

View full text Add to dashboard Cite

show abstract

“…Spinning thermal radiation can be understood as the selective emission phenomenon of chiral structures towards circularly polarized light (CPL) with different helicities [19,20]. While naturally occurring chiral materials do exist, their chiral effects are often weak, posing limitations on their practical applications.…”

Section: Introductionmentioning

confidence: 99%

Strong spinning thermal radiation enabled by germanium-based chiral dielectric metasurface

Guo,

Wu,

et al. 2024

J. Opt.

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Spinning thermal radiation refers to the phenomenon of selective emission of circularly polarized waves from chiral structures with polarization dependence or symmetry breaking. This phenomenon finds diverse applications in fields such as radiation detection and chiral sensing. In this study, we introduce a dielectric metasurface composed of a periodic arrangement of Germanium (Ge) elliptical disks, which can exhibit circular dichroism (CD) with a maximum value of approximately 0.93 at the optimal structural parameters. The physical mechanism of the strong CD is analyzed through the polarization conversion and distributions of the electric field. Moreover, the influence of structural parameters on the spinning thermal radiation is also analyzed. It is found that the CD is closely related to the height and period of the Ge-based chiral dielectric metasurface rather than the rotation angle. This work not only provides valuable insights into the design and optimization of spinning thermal radiation using metasurfaces, but also holds promise for its engineering applications in the field of thermal detection.

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Sign manipulation of nonreciprocity in Weyl-semimetal-based thermal emitter

Wang,

Qian,

Zheng

et al. 2024

International Communications in Heat and Mass Transfer

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Spin-selective thermal radiation with near-perfect circular dichroism in twisted hyperbolic materials

Cited by 8 publications

References 59 publications

Tunable and strong circular dichroism mediated with graphene-Weyl semimetal planar scheme

Tunable and strong circular dichroism mediated with graphene-Weyl semimetal planar scheme

Strong spinning thermal radiation enabled by germanium-based chiral dielectric metasurface

Sign manipulation of nonreciprocity in Weyl-semimetal-based thermal emitter

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