Photonic Weyl points due to broken time-reversal symmetry in magnetized semiconductor

Wang, Dongyang; Yang, Biao; Gao, Wenlong; Jia, Hongwei; Yang, Quanlong; Chen, Xieyu; Wei, Minggui; Liu, Changxu; Navarro‐Cía, Miguel; Han, Jiaguang; Zhang, Weili; Zhang, Shuang

doi:10.1038/s41567-019-0612-7

Cited by 94 publications

(68 citation statements)

References 38 publications

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“…Drawing inspiration from the discovery of the quantum-Hall effects, Dirac/Wey/nodal-line semimetals, and topological insulators in condensed matter theory, recent advances have shown how to engineer analogous effects also for photons, leading to remarkable phenomena, such as unidirectional surface states. [174][175][176][177][178][179] Two inspiring recent works in the THz regime are the experimental detection of photonic Weyl points in a time-reversal symmetry-breaking system, 180 and the experimental demonstration of robust THz topological valley transport on all-silicon chips. 181 Indeed, the highly robust topological effect is of great complementarity to the THz technology for high speed, low loss, and large capacity communications.…”

Section: Discussionmentioning

confidence: 99%

Terahertz surface plasmonic waves: a review

et al. 2020

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Terahertz science and technology promise many cutting-edge applications. Terahertz surface plasmonic waves that propagate at metal-dielectric interfaces deliver a potentially effective way to realize integrated terahertz devices and systems. Previous concerns regarding terahertz surface plasmonic waves have been based on their highly delocalized feature. However, recent advances in plasmonics indicate that the confinement of terahertz surface plasmonic waves, as well as their propagating behaviors, can be engineered by designing the surface environments, shapes, structures, materials, etc., enabling a unique and fascinating regime of plasmonic waves. Together with the essential spectral property of terahertz radiation, as well as the increasingly developed materials, microfabrication, and time-domain spectroscopy technologies, devices and systems based on terahertz surface plasmonic waves may pave the way toward highly integrated platforms for multifunctional operation, implementation, and processing of terahertz waves in both fundamental science and practical applications. We present a review on terahertz surface plasmonic waves on various types of supports in a sequence of properties, excitation and detection, and applications. The current research trend and outlook of possible research directions for terahertz surface plasmonic waves are also outlined.

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Section: Discussionmentioning

confidence: 99%

Terahertz surface plasmonic waves: a review

et al. 2020

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“…The first achievement in 3D topological photonics was the numerical demonstration of a Weyl point using photonic crystals 108 . Since then, photonic systems that possess Weyl points have been extensively studied and realized in homogeneous media 110,111 , photonic crystals [112][113][114][115][116] , and metamaterials 109,[117][118][119] . Such Weyl systems have exhibited various unprecedented phenomena, such as topological surface states connecting a pair of Weyl points 120 , the quantum anomalous Hall effect 105 , and chiral anomalies 121 .…”

Section: D Gapless Phasementioning

confidence: 99%

Recent advances in 2D, 3D and higher-order topological photonics

2020

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Over the past decade, topology has emerged as a major branch in broad areas of physics, from atomic lattices to condensed matter. In particular, topology has received significant attention in photonics because light waves can serve as a platform to investigate nontrivial bulk and edge physics with the aid of carefully engineered photonic crystals and metamaterials. Simultaneously, photonics provides enriched physics that arises from spin-1 vectorial electromagnetic fields. Here, we review recent progress in the growing field of topological photonics in three parts. The first part is dedicated to the basics of topological band theory and introduces various two-dimensional topological phases. The second part reviews three-dimensional topological phases and numerous approaches to achieve them in photonics. Last, we present recently emerging fields in topological photonics that have not yet been reviewed. This part includes topological degeneracies in nonzero dimensions, unidirectional Maxwellian spin waves, higher-order photonic topological phases, and stacking of photonic crystals to attain layer pseudospin. In addition to the various approaches for realizing photonic topological phases, we also discuss the interaction between light and topological matter and the efforts towards practical applications of topological photonics.

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“…It is defined as the ratio of the crosspolar component of the field at a specific point in space to the maximum co-polar field. Despite the cross-polar level being an important characteristic for antennas [21], [30], [31], quasioptical systems [10], [32] and spectroscopy of anisotropic materials [33], [34] and metamaterials [35]- [38], it is rarely reported for THz TDS systems, except on-axis.…”

Section: Cross-polarized Field Distributionmentioning

confidence: 99%

Beam Profiling of a Commercial Lens-Assisted Terahertz Time Domain Spectrometer

Freer

Gorodetsky

Navarro‐Cía

2021

IEEE Trans. THz Sci. Technol.

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To undertake THz spectroscopy and imaging, and accurately design and predict the performance of quasi-optical components, knowledge of the parameters of the beam (ideally Gaussian) emitted from a THz source is paramount. Despite its proliferation, relatively little work has been done on this in the frame of broadband THz photoconductive antennas. Using primarily pinhole scanning methods, along with stepwise angular spectrum simulations, we investigate the profile and polarization characteristics of the beam emitted by a commercial silicon-lensintegrated THz photoconductive antenna and collimated by a TPX (polymethylpentene) lens. Our study flags the limitations of the different beam profiling methods and their impact on the beam Gaussianity estimation. A non-Gaussian asymmetric beam is observed, with main lobe beam waists along x and y varying from 8.4±0.7 mm and 7.7±0.7 mm at 0.25 THz, to 1.4±0.7 mm and 1.4±0.7 mm at 1 THz, respectively. Additionally, we report a maximum cross-polar component relative to the on-axis co-polar component of-11.6 dB and-21.2 dB, at 0.25 THz and 1 THz, respectively.

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Photonic Weyl points due to broken time-reversal symmetry in magnetized semiconductor

Cited by 94 publications

References 38 publications

Terahertz surface plasmonic waves: a review

Terahertz surface plasmonic waves: a review

Recent advances in 2D, 3D and higher-order topological photonics

Beam Profiling of a Commercial Lens-Assisted Terahertz Time Domain Spectrometer

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