Chiral Surface Wave Propagation with Anomalous Spin-Momentum Locking

Kandil, Sara M.; Bisharat, Dia’aaldin J.; Sievenpiper, Daniel F.

doi:10.1021/acsphotonics.2c00491

Cited by 4 publications

(2 citation statements)

References 40 publications

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“…This new thermal polarization vector describes chiral thermal waves with spin-momentum locking in accordance with a similar dynamics of general chiral surface waves discussed in a recent paper [14].…”

Section: Introductionsupporting

confidence: 83%

A Thermal Analogue of the Zel’Dovich Effect

Bei

2023

JAMP

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We analyze in this work anisotropic heat conduction induced by a harmonically oscillating laser source incident on rotating conductors, exploiting an analogy with an effect discovered long ago, called the Zel'dovich effect. We re-covered the main results of a recently published paper that predicts the translational Doppler frequency shift of a thermal wave induced on a sample moving with uniform rectilinear motion. We extend then this framework to take into account the frequency shift of a thermal field propagating on a rotating platform. We show that it coincides with the rotational frequency shift which has been recently observed on surface acoustic waves and hydrodynamic surface waves, called rotational superradiance. Finally, we use an analogy with the Tolman effect to deduce a simple estimate of the average temperature gradient induced by rotation, showing the existence of a new cooling effect associated with heat torque transfer.

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Section: Introductionsupporting

confidence: 83%

A Thermal Analogue of the Zel’Dovich Effect

Bei

2023

JAMP

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“…For example, as described earlier, a broken rotational symmetry can produce flatter contours along the x-or y-axis. 45 0 mirror symmetry of a shape can result in tilted contours [37]. In recent decades, there has been a great interest in gradient metasurfaces which are non-periodic surfaces aimed for wavefront manipulation for beam steering applications in near-or far-fields [38].…”

Section: Inhomogeneous Metasurfacementioning

confidence: 99%

Engineering Equifrequency Contours of Metasurfaces for Self-Collimated Surface Wave Steering

Kandil¹,

Bisharat²,

Sievenpiper³

2022

Preprint

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Metasurfaces provide unique capability in guiding surface waves and controlling their polarization and dispersion properties. One way to do that is by analyzing their equifrequency contours. Equifrequency contours are the 2D projection of the 3D dispersion diagram. Since they are a kspace map representation of the surface, many of the wave properties can be understood through the Equifrequency contours. In this paper, we investigate numerically and experimentally the engineering of equifrequency contours using C-shape metasurface design. We show the ability to provide high self-collimation as well as spin-dependent wave splitting for the same metasurface by tuning the frequency of operation. We also show the ability to steer the wave along a defined curved path by rotating the C-shape which results in rotating its equifrequency contours. This work demonstrates how engineering equifrequency contours can be used as a powerful tool for controlling the surface wave propagation properties.

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Spin Photonics‐Based on a Twinning Hyperbolic Metamaterial

Li,

Sun,

Wen

et al. 2024

Adv Funct Materials

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Routing and multiplexing of the optical surface waves are critical for the ultra‐compact nano‐photonic systems. Given this background, traditional metal‐based systems, despite of the ability of supporting the surface plasmon polariton propagation, are constrained on manipulations due to the optical isotropy, and artificially designed structures are always required at the input or output to help attain the additional selectivity. Here, a spin‐dependent multi‐channel scheme is proposed based on the modulation ability of the hyperbolic metamaterial's anisotropy on Dyakonov Surface Waves. The input coupling, propagation direction, as well as the output coupling of the optical single are well determined by the certain spin feature carried by the light and the orientation of the interface's anisotropy because of the spin‐momentum locking. Specially, by constructing a twinning hyperbolic metamaterial, which contains the structural symmetry and materials symmetry, a photonic chip with 4 routing channels are demonstrated experimentally, where the spin of an incident beam can be maintained during the propagation on‐chip and then delivered back into the free space, offering a new planar scheme for metamaterial‐based spin‐controlled nano‐photonic applications.

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Chiral Surface Wave Propagation with Anomalous Spin-Momentum Locking

Cited by 4 publications

References 40 publications

A Thermal Analogue of the Zel’Dovich Effect

A Thermal Analogue of the Zel’Dovich Effect

Engineering Equifrequency Contours of Metasurfaces for Self-Collimated Surface Wave Steering

Spin Photonics‐Based on a Twinning Hyperbolic Metamaterial

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