Spinning Radiation from Topological Insulator

Khan, Emroz; Narimanov, Evgenii E.

doi:10.1364/fio.2019.jw4a.31

Cited by 2 publications

(3 citation statements)

References 7 publications

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“…Besides, recent studies reveal that the thermal radiation from topological insulators 20,21 and Weyl semimetals 22 exhibits circularly polarized characteristics. This is a manifestation of the microscopic mechanisms where the fluctuation-driven torque is generated under magnetic fields.…”

Section: Mainmentioning

confidence: 99%

Observation of Non-Vanishing Optical Helicity in Thermal Radiation from Symmetry-Broken Metasurfaces

Wang¹,

Sentz²,

Bharadwaj³

et al. 2022

Preprint

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Thermal radiation is traditionally an incoherent radiative signal, where the radiated heat is highly unpolarized, spectrally broad, and omnidirectional. The recent extensive interests in thermal photonics focus on tailoring the temporal coherence (spectrum) and spatial coherence (directivity) of thermal radiation. Here, we investigate the photon spin characteristics of the radiation excited by thermal fluctuations using a symmetrybroken metasurface. Utilizing spin-polarized angle-resolved thermal emission spectroscopy (SPARTES), we explicitly show when both mirror-and inversion-symmetries are broken, the summation of spin-angular momentum projected on wavevectors, namely the optical helicity, can be non-vanishing even without applying a magnetic

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Section: Mainmentioning

confidence: 99%

Observation of Non-Vanishing Optical Helicity in Thermal Radiation from Symmetry-Broken Metasurfaces

Wang¹,

Sentz²,

Bharadwaj³

et al. 2022

Preprint

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show abstract

“…In analogy with celestial observations, it has recently come to light that the application of an external magnetic field or intrinsic nonreciprocity in generic bianisotropic media also leads to circularly polarized thermal emission characteristics. This is true for magneto-optical materials (15), topological Weyl semimetals (16,17), and topological insulators (18,19). This phenomenon of spinning thermal radiation is yet to be observed because of material constraints and the requirement of magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

“…This phenomenon of spinning thermal radiation is yet to be observed because of material constraints and the requirement of magnetic fields. When time-reversal symmetry is preserved such as in hyperbolic materials ( 20 ), the circularly polarized thermal radiation is predicted at specific angles ( 20 ), but the overall purity is very small ( 19 ). Also, in the hyperbolic case, the thermo-optic helicity, which is the summation of the projected SAM over the far-field hemisphere, is always zero/near zero.…”

Section: Introductionmentioning

confidence: 99%

Observation of nonvanishing optical helicity in thermal radiation from symmetry-broken metasurfaces

et al. 2023

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Spinning thermal radiation is a unique phenomenon observed in condensed astronomical objects, including the Wolf-Rayet star EZ-CMa and the red degenerate star G99-47, due to the existence of strong magnetic fields. Here, by designing symmetry-broken metasurfaces, we demonstrate that spinning thermal radiation with a nonvanishing optical helicity can be realized even without applying a magnetic field. We design nonvanishing optical helicity by engineering a dispersionless band that emits omnidirectional spinning thermal radiation, where our design reaches 39% of the fundamental limit. Our results firmly suggest that metasurfaces can impart spin coherence in the incoherent radiation excited by thermal fluctuations. The symmetry-based design strategy also provides a general pathway for controlling thermal radiation in its temporal and spin coherence.

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Spinning Radiation from Topological Insulator

Cited by 2 publications

References 7 publications

Observation of Non-Vanishing Optical Helicity in Thermal Radiation from Symmetry-Broken Metasurfaces

Observation of Non-Vanishing Optical Helicity in Thermal Radiation from Symmetry-Broken Metasurfaces

Observation of nonvanishing optical helicity in thermal radiation from symmetry-broken metasurfaces

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