Journal ArticleDOI
Ghost hyperbolic surface polaritons in bulk anisotropic crystals.
Weiliang Ma,Guangwei Hu,Guangwei Hu,Debo Hu,Runkun Chen,Tian Sun,Xinliang Zhang,Qing Dai,Ying Zeng,Andrea Alù,Cheng-Wei Qiu,Peining Li +11 more
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TLDR
In this article, a near-field observation of ghost phonon polaritons is reported, which propagate with in-plane hyperbolic dispersion on the surface of a polar uniaxial crystal and, at the same time, exhibit oblique wavefronts in the bulk.Abstract:
Polaritons in anisotropic materials result in exotic optical features, which can provide opportunities to control light at the nanoscale1-10. So far these polaritons have been limited to two classes: bulk polaritons, which propagate inside a material, and surface polaritons, which decay exponentially away from an interface. Here we report a near-field observation of ghost phonon polaritons, which propagate with in-plane hyperbolic dispersion on the surface of a polar uniaxial crystal and, at the same time, exhibit oblique wavefronts in the bulk. Ghost polaritons are an atypical non-uniform surface wave solution of Maxwell's equations, arising at the surface of uniaxial materials in which the optic axis is slanted with respect to the interface. They exhibit an unusual bi-state nature, being both propagating (phase-progressing) and evanescent (decaying) within the crystal bulk, in contrast to conventional surface waves that are purely evanescent away from the interface. Our real-space near-field imaging experiments reveal long-distance (over 20 micrometres), ray-like propagation of deeply subwavelength ghost polaritons across the surface, verifying long-range, directional and diffraction-less polariton propagation. At the same time, we show that control of the out-of-plane angle of the optic axis enables hyperbolic-to-elliptic topological transitions at fixed frequency, providing a route to tailor the band diagram topology of surface polariton waves. Our results demonstrate a polaritonic wave phenomenon with unique opportunities to tailor nanoscale light in natural anisotropic crystals.read more
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Journal ArticleDOI
Hyperbolic metamaterials: fusing artificial structures to natural 2D materials
Dasol Lee,Sunae So,Guangwei Hu,Minkyung Kim,Trevon Badloe,Han-Chul Cho,Jaekyung Kim,Hongyoon Kim,Cheng-Wei Qiu,Junsuk Rho +9 more
TL;DR: Hyperbolic metamaterials have an extremely high anisotropy with a hyperbolic dispersion relation and exhibit a high density of states which have been exploited in various applications, such as super-resolution imaging, negative refraction, and enhanced emission control as mentioned in this paper .
Journal ArticleDOI
Interface nano-optics with van der Waals polaritons.
Qing Zhang,Guangwei Hu,Weiliang Ma,Peining Li,Alex Krasnok,Rainer Hillenbrand,Rainer Hillenbrand,Andrea Alù,Cheng-Wei Qiu +8 more
TL;DR: In this paper, the authors provide an overview of the state of the art of interface optics for the control of van der Waals polaritons, including refractive optics, meta-optics and moire engineering.
Journal ArticleDOI
Optical Metasurfaces for Energy Conversion
E. Cortes,Fedja J. Wendisch,Luca Sortino,Andrea Mancini,S. Ezendam,Seryio Saris,Leonardo de S. Menezes,Andreas Tittl,Haoran Ren,Stefan A. Maier +9 more
TL;DR: In this paper , the impact, opportunities, applications, and challenges of optical metasurfaces in converting the energy of incoming photons into frequency-shifted photons, phonons, and energetic charge carriers are discussed.
Journal ArticleDOI
Manipulating polaritons at the extreme scale in van der Waals materials
Yingjie Wu,Jiahua Duan,Weiliang Ma,Qingdong Ou,Peining Li,Pablo Alonso-González,Joshua D. Caldwell,Qiaoliang Bao +7 more
Journal ArticleDOI
Active Tuning of Highly Anisotropic Phonon Polaritons in Van der Waals Crystal Slabs by Gated Graphene
TL;DR: In this paper , anisotropic PhPs supported by biaxial van der Waals (vdW) slabs are actively tuned by simply gating an integrated graphene layer, which enables controlling the canalization of PhPs along different in-plane directions in twisted heterostructures.
References
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Journal ArticleDOI
Tunable Phonon Polaritons in Atomically Thin van der Waals Crystals of Boron Nitride
Siyuan Dai,Zhe Fei,Qiong Ma,Aleksandr Rodin,Martin Wagner,Alexander McLeod,Mengkun Liu,Will Gannett,Will Gannett,William Regan,William Regan,Kenji Watanabe,Takashi Taniguchi,Mark H. Thiemens,Gerardo Dominguez,Gerardo Dominguez,A. H. Castro Neto,A. H. Castro Neto,Alex Zettl,Alex Zettl,Fritz Keilmann,Pablo Jarillo-Herrero,Michael M. Fogler,Dimitri Basov +23 more
TL;DR: The measured dispersion of polaritonic waves was shown to be governed by the crystal thickness according to a scaling law that persists down to a few atomic layers, likely to hold true in other polar van der Waals crystals and may lead to new functionalities.
Journal ArticleDOI
Polaritons in layered two-dimensional materials
Tony Low,Andrey Chaves,Joshua D. Caldwell,Anshuman Kumar,Anshuman Kumar,Nicholas X. Fang,Phaedon Avouris,Tony F. Heinz,Francisco Guinea,Francisco Guinea,Luis Martín-Moreno,Frank H. L. Koppens,Frank H. L. Koppens +12 more
TL;DR: The emerging field of 2D material polaritonics and their hybrids provide enticing avenues for manipulating light-matter interactions across the visible, infrared to terahertz spectral ranges, with new optical control beyond what can be achieved using traditional bulk materials.
Journal ArticleDOI
Polaritons in van der Waals materials
TL;DR: This work discusses polaritons in van der Waals (vdW) materials: layered systems in which individual atomic planes are bonded by weak vdW attraction, thus enabling unparalleled control of polaritonic response at the level of single atomic planes.
Journal ArticleDOI
Sub-diffractional volume-confined polaritons in the natural hyperbolic material hexagonal boron nitride
Joshua D. Caldwell,Andrey V. Kretinin,Yiguo Chen,Vincenzo Giannini,Michael M. Fogler,Yan Francescato,Chase T. Ellis,Joseph G. Tischler,Colin R. Woods,Alexander J. Giles,Minghui Hong,Kenji Watanabe,Takashi Taniguchi,Stefan A. Maier,Kostya S. Novoselov +14 more
TL;DR: Three-dimensionally confined 'hyperbolic polaritons' in boron nitride nanocones that support four series (up to the seventh order) modes in two spectral bands are reported on.
Journal ArticleDOI
Polaritons in layered 2D materials
Tony Low,Andrey Chaves,Joshua D. Caldwell,Anshuman Kumar,Nicholas X. Fang,Phaedon Avouris,Tony F. Heinz,Francisco Guinea,Luis Martín-Moreno,Frank H. L. Koppens +9 more
TL;DR: In this paper, the authors review recent progress in state-of-the-art experiments, survey the vast library of polaritonic modes in 2D materials, their optical spectral properties, figures ofmerit and application space.