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Articles by Peining Li
Nano-wrinkle waveguides for programmable polariton channeling
Abstract The intrinsic planarity of two-dimensional (2D) van der Waals (vdW) polaritonic media inherently limits the lateral confinement of vdW polaritons. Here, we transcend this geometric limit by introducing a deterministic strategy to engineer non-planar nano-wrinkle waveguides in hexagonal boron nitride (hBN) via controlled thermal buckling.
Two-dimensional metal oxide polaritonics
Abstract Two-dimensional (2D) metal oxides (MOs) are crucial materials in semiconductor optoelectronics and energy applications. Recently, ultra-confined and anisotropic polaritons, which are hybrid light-matter waves, in 2D MOs have renewed interest in the field of nanophotonics.
Flatland wakes based on leaky hyperbolic polaritons - Nature Materials
Abstract Hyperbolic polaritons facilitate nanoscale light manipulation, but strong field confinement limits their transmission across interfaces. Conversely, leaky waves can convert radiation from confined sources towards the far field. Here we combine hyperbolic polaritons and leaky wave radiation to demonstrate flatland leaky polaritonic wakes. We employ a mixed-dimensional van der Waals heterostructure consisting of a nanoscale waveguide strip on a van der Waals film.
Long-range hyperbolic polaritons on a non-hyperbolic crystal surface - Nature
Abstract Hybridized matter–photon excitations in hyperbolic crystals—anisotropic materials characterized by permittivity tensor components with opposite sign—have attracted substantial attention owing to their strong light–matter interactions in the form of hyperbolic polaritons1,2,3. However, these phenomena have been restricted to hyperbolic crystals, whose optical responses are confined to fixed spectral regions and lack tunability, thereby limiting their broader applicability4,5.
Preparation of pH-Sensitive Poly (N-(2-Hydroxyethyl) Acrylamide-co-acrylic Acid) Hydrogels and Their Performance
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Two-dimensional polyaniline crystal with metallic out-of-plane conductivity - Nature
Abstract Linear conducting polymers show ballistic transport, imposed by mobile carriers moving along the polymer chains1,2, whereas conductance in the extended dimension, that is, between polymer strands or layers, remains weak due to the lack of intermolecular ordering and electronic coupling3,4,5. Here we report a multilayer-stacked two-dimensional polyaniline (2DPANI) crystal, which shows metallic out-of-plane charge transport with high electrical conductivity.
Hyperbolic-to-hyperbolic transition at exceptional Reststrahlen point in rare-earth oxyorthosilicates - Nature Communications
Abstract Anisotropic optical crystals can exhibit a hyperbolic response within the Reststrahlen band (RB) and support directional polaritonic propagations when interacting with light. Most of the reported low-symmetry optical crystals showcase the evolution from hyperbolic to elliptic dispersion topologies, largely owing to their adjacent RBs being either overlapped or separated.
Visible to mid-infrared giant in-plane optical anisotropy in ternary van der Waals crystals - Nature Communications
Abstract Birefringence is at the heart of photonic applications. Layered van der Waals materials inherently support considerable out-of-plane birefringence. However, funnelling light into their small nanoscale area parallel to its out-of-plane optical axis remains challenging. Thus far, the lack of large in-plane birefringence has been a major roadblock hindering their applications.
Observation of directional leaky polaritons at anisotropic crystal interfaces - Nature Communications
Abstract Extreme anisotropy in some polaritonic materials enables light propagation with a hyperbolic dispersion, leading to enhanced light-matter interactions and directional transport. However, these features are typically associated with large momenta that make them sensitive to loss and poorly accessible from far-field, being bound to the material interface or volume-confined in thin films.
From the Malay Peninsula to the Shandong Peninsula: The Transmission of Buddha Statues with Tight-Fitting Robe in the Sixth Century
Abstract : Within the cultural integration of Indian Buddhist art and Chinese Buddhist art, standing Buddha statues carved in-the-round with thin, tight-fitting robes require special attention. Unlike other types of Buddha statues found in China, they are depicted wearing robes of a foreign style, while displaying the facial and body features of East Asians.
Real-space nanoimaging of hyperbolic shear polaritons in a monoclinic crystal - Nature Nanotechnology
Author notes These authors contributed equally: Guangwei Hu, Weiliang Ma, Debo Hu. Authors and Affiliations Department of Electrical and Computer Engineering, National University of Singapore, Singapore, Singapore Guangwei Hu, Chunqi Zheng, Kaipeng Liu & Cheng-Wei Qiu Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China Weiliang Ma, Xinliang Zhang & Peining Li CAS Key Laboratory of...
The past, present, and future for constitutional ring chromosomes: A report of the international consortium for human ring chromosomes
27 Cote G.B. Katsantoni A. Deligeorgis D. The cytogenetic and clinical implications of a ring chromosome 2. Ann. Genet. 24: 231-235 The abnormal phenotypes will usually be a mixture of three main effects from (1) the original distal or telomeric deletions that accompanied the ring formation, (2) the further aneuploidies produced by the ring mechanics, and (3) the massive cell death and the ensuing enormous waste of metabolism. The latter can be expected to be the same in all patients with an RC.
Doping-driven topological polaritons in graphene/α-MoO3 heterostructures - Nature Nanotechnology
Abstract Control over charge carrier density provides an efficient way to trigger phase transitions and modulate the optoelectronic properties of materials. This approach can also be used to induce topological transitions in the optical response of photonic systems. Here we report a topological transition in the isofrequency dispersion contours of hybrid polaritons supported by a two-dimensional heterostructure consisting of graphene and α-phase molybdenum trioxide.
Ghost hyperbolic surface polaritons in bulk anisotropic crystals - Nature
Abstract Polaritons in anisotropic materials result in exotic optical features, which can provide opportunities to control light at the nanoscale1,2,3,4,5,6,7,8,9,10. 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.
Collective near-field coupling and nonlocal phenomena in infrared-phononic metasurfaces for nano-light canalization
Abstract Polaritons – coupled excitations of photons and dipolar matter excitations – can propagate along anisotropic metasurfaces with either hyperbolic or elliptical dispersion. At the transition from hyperbolic to elliptical dispersion (corresponding to a topological transition), various intriguing phenomena are found, such as an enhancement of the photonic density of states, polariton canalization and hyperlensing.
Infrared hyperbolic metasurface based on nanostructured van der Waals materials
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