Featured
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| Open AccessDirectional thermal emission and display using pixelated non-imaging micro-optics
The authors demonstrate ultrabroadband, polarisation-independent directional control of thermal radiation using a pixelated micro-emitter, and produce large emissivity contrast at different directions, with potential applications to radiative cooling, infrared spectroscopy and thermophotovoltaics.
- Ziwei Fan
- , Taeseung Hwang
- & Zi Jing Wong
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Article
| Open AccessMicrowave-transparent metallic metamaterials for autonomous driving safety
Lee et al. developed ultrathin metallic (metal filling ratios of > 70 %) metamaterials that exhibit perfect transmission at a specific radar frequency. These characteristics enable microwave transparent, low-sheet-resistance radar heaters for safe autonomous driving in extreme weather.
- Eun-Joo Lee
- , Jun-Young Kim
- & Sun-Kyung Kim
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Article
| Open AccessReconfigurable image processing metasurfaces with phase-change materials
Researchers demonstrate that image-processing metasurfaces can be dynamically reconfigured by using phase-change materials. The work might lead to novel tunable devices for compact optical computing for applications in AR/VR and bio-medical imaging.
- Michele Cotrufo
- , Shaban B. Sulejman
- & Andrea Alù
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| Open AccessIntegrated photonic encoder for low power and high-speed image processing
The researchers showcase a silicon-photonics-based analog approach for large-scale image processing that can be deployed for high-speed image compression and de-noising using an auto-encoder framework with minimal power consumption.
- Xiao Wang
- , Brandon Redding
- & Raktim Sarma
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Article
| Open AccessHumidity-tolerant porous polymer coating for passive daytime radiative cooling
A consistency issue with the production of porous polymer-based radiative coatings can be a significant drop in the cooling performance when dried under humid conditions. This issue is efficiently resolved by adding polymer reinforcement.
- Dongpyo Hong
- , Yong Joon Lee
- & Sang Yoon Park
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Article
| Open AccessNon-thermal emission in gap-mode plasmon photoluminescence
Photoluminescence from plasmonic nanostructures exhibits diverse wavelength dependent nonlinear behaviors with debated origins. Here, authors use plasmonic gap mode resonators with precise nanoscale confinement to show this nonlinear emission can become dominated by non-Fermi carrier contributions.
- Robert Lemasters
- , Manoj Manjare
- & Hayk Harutyunyan
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Article
| Open AccessSteering and cloaking of hyperbolic polaritons at deep-subwavelength scales
Polaritons – hybrid light-matter excitations – in van der Waals materials hold promise for photonics applications below the diffraction limit. Here, the authors demonstrate in-plane steering and cloaking of phonon polaritons in assembled micro-structures based on α-MoO3 films with misaligned crystallographic orientations.
- Hanchao Teng
- , Na Chen
- & Qing Dai
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Article
| Open AccessHybrid architectures for terahertz molecular polaritonics
Metasurface-based architectures enhance light-matter interactions between a terahertz photonic mode and glucose vibrational resonance. This platform allows new physical and chemical properties of hybrid light-matter states to be exploited.
- Ahmed Jaber
- , Michael Reitz
- & Jean-Michel Ménard
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Article
| Open AccessTransparent radiative cooling cover window for flexible and foldable electronic displays
In this work, authors synthesize transparent radiative cooling cover windows for flexible and foldable electronic devices. Besides demonstrated enhanced mechanical and moisture-impermeable properties, these mitigate temperature rise of devices under solar irradiation and improve overall thermal management.
- Kang Won Lee
- , Jonghun Yi
- & Dong Rip Kim
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Article
| Open AccessCrown ether decorated silicon photonics for safeguarding against lead poisoning
Lead toxification in society is a public health crisis. The exposure to lead poisoning gives rise to a multitude of health issues. In this work, a chip-scale photonic platform that enables the highly quantitative detection of lead is demonstrated.
- Luigi Ranno
- , Yong Zen Tan
- & Jia Xu Brian Sia
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Article
| Open AccessUltra-narrowband and rainbow-free mid-infrared thermal emitters enabled by a flat band design in distorted photonic lattices
Narrowband thermal emitters realized with photonic nanostructures usually suffer from the rainbow effect. Here, the authors demonstrate rainbow-free thermal emissions with high temporal coherence through harnessing flatband high-Q resonances.
- Kaili Sun
- , Yangjian Cai
- & Zhanghua Han
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Article
| Open AccessGiant magneto-photoluminescence at ultralow field in organic microcrystal arrays for on-chip optical magnetometer
The optical detection of magnetic fields is difficult for low field strengths. Here, the authors show how strong magneto-photoluminescence can be achieved in rubrene microcrystals and demonstrate its application in a magnetometer.
- Hong Wang
- , Baipeng Yin
- & Chuang Zhang
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Article
| Open AccessSingle-photon detection using large-scale high-temperature MgB2 sensors at 20 K
Superconducting nanowire single-photon detectors require operation at T < 4 K, and successful attempts to extend their operation at 20 K and above using high-TC BSCCO flakes come at the cost of lower scalability to large areas. Here, the authors break this trade-off by using high-quality MgB2 films and exploiting a helium-ion beam-based irradiation process.
- Ilya Charaev
- , Emma K. Batson
- & Karl K. Berggren
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Article
| Open AccessNonvolatile optical phase shift in ferroelectric hafnium zirconium oxide
The authors present nonvolatile optical phase shift induced by ferroelectric hafnium zirconium oxide deposited on a SiN waveguide. This finding paves the way for largescale programmable photonic circuits for communication, computing, and sensing.
- Kazuma Taki
- , Naoki Sekine
- & Mitsuru Takenaka
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Article
| Open AccessAnti-resonant acoustic waveguides enabled tailorable Brillouin scattering on chip
Achieving acoustic waveguides with low loss, tailorability, and easy fabrication is a considerable challenge. Here, the authors introduce suspended anti-resonant acoustic waveguides with superior confinement and high selectivity of acoustic modes, supporting both forward and backward SBS on chip.
- Peng Lei
- , Mingyu Xu
- & Xiaopeng Xie
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Article
| Open AccessControlling the broadband enhanced light chirality with L-shaped dielectric metamaterials
L-shaped silicon metamaterials are realized exhibiting broadband and enhanced chirality. The current work sets new benchmarks in the assembly of ultrathin dielectric chiral metamaterials that can efficiently control chiral light-matter interactions.
- Ufuk Kilic
- , Matthew Hilfiker
- & Christos Argyropoulos
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Article
| Open AccessArbitrary engineering of spatial caustics with 3D-printed metasurfaces
Caustics, as a unique type of singularity in wave phenomena, occur in diverse physical systems. Here, the authors realize multi-dimensional customization of caustics with 3D-printed metasurfaces. This arbitrary caustic engineering is poised to bring new revolutions to many domains.
- Xiaoyan Zhou
- , Hongtao Wang
- & Cheng-Wei Qiu
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Article
| Open AccessWaveguide-integrated twisted bilayer graphene photodetectors
Silicon-integrated graphene photodetectors exhibit promising bandwidths at telecom wavelengths, but their responsivity is usually limited. Here, the authors report the wafer-scale fabrication of waveguide-integrated detectors based on twisted bilayer graphene, showing responsivities up to 0.65 A/W and 3-dB bandwidths >65 GHz.
- Qinci Wu
- , Jun Qian
- & Hailin Peng
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Article
| Open AccessBoosting organic phosphorescence in adaptive host-guest materials by hyperconjugation
Room-temperature phosphorescence is usually inefficient in purely organic material. Here, the authors achieve near-unity phosphorescence efficiency with color tunability in adaptive host-guest materials through use of hyperconjugation.
- Huili Ma
- , Lishun Fu
- & Wei Huang
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Article
| Open AccessIsostructural doping for organic persistent mechanoluminescence
Organic mechanoluminescent materials have potential in a range of applications, but it can be challenging to achieve long-lived emission. Here, the authors report isostructural doping as a strategy to achieve multicolour and high efficiency organic mechanoluminescence, applied in stress sensing.
- Zongliang Xie
- , Yufeng Xue
- & Bin Liu
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Article
| Open AccessInkjet-printed optical interference filters
Optical interference filters are multilayer structures for controlling the propagation of electromagnetic waves. Jin et al. have developed a method of via inkjet printing to fabricate optical interference filters with commercially relevant quality with remarkable A4 paper size (29.7 × 21.0 cm²) in ambient conditions.
- Qihao Jin
- , Qiaoshuang Zhang
- & Uli Lemmer
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Article
| Open AccessElectrostatic steering of thermal emission with active metasurface control of delocalized modes
Dynamic angular tuning of thermal emission is a problem in the field of thermal metasurfaces. Here, the authors make a thermal emission device using electrostatic gates, opening an avenue for radiative heat management and mid-infrared communication.
- Joel Siegel
- , Shinho Kim
- & Victor Watson Brar
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Article
| Open AccessHigh-throughput quantum photonic devices emitting indistinguishable photons in the telecom C-band
An efficient way of realising a large number of telecom single-photon emitters for quantum communication is still missing. Here, the authors use a wide-field imaging technique for fast localization of single InAs/InP quantum dots, which are then integrated into circular Bragg grating cavities featuring high single-photon purity and indistinguishability.
- Paweł Holewa
- , Daniel A. Vajner
- & Elizaveta Semenova
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| Open AccessExciton polariton condensation from bound states in the continuum at room temperature
Bound states in continuum have attracted attention in various platforms, and recently condensation of bound states in continuum polariton modes was demonstrated at low temperatures. Here the authors report the observation of such a state in a periodic air-hole perovskite-based photonic crystal at room temperature.
- Xianxin Wu
- , Shuai Zhang
- & Xinfeng Liu
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Article
| Open AccessUltrastrong exciton-plasmon couplings in WS2 multilayers synthesized with a random multi-singular metasurface at room temperature
Here, the authors fabricate a metasurface with nanometre-sized plasmonic hotspots that interact coherently with WS2 excitons, achieving ultrastrong exciton-plasmon coupling.
- Tingting Wu
- , Chongwu Wang
- & Yu Luo
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| Open AccessUltrafast photoluminescence and multiscale light amplification in nanoplasmonic cavity glass
This article presents a unique nanocomposite plasmonic-excitonic glass with extraordinary amplified optical properties: ultra-narrow photoluminescence (FWHM = 13 nm) and ultrashort photoluminescence lifetime (90 ps) at room temperature
- Piotr Piotrowski
- , Marta Buza
- & Dorota A. Pawlak
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Article
| Open AccessOrigami metamaterials for ultra-wideband and large-depth reflection modulation
The researchers fuse metamaterials and origami technical to achieve ultra-wideband and large-depth reflection modulation. Flexible electronics amplify its lightweight, transparency, and cost-effectiveness, making it ideal for satellite communications.
- Zicheng Song
- , Juan-Feng Zhu
- & Cheng-Wei Qiu
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Article
| Open AccessA 2D chiral microcavity based on apparent circular dichroism
Here the authors induce asymmetric transmission in planar Fabry–Pérot microcavities by embedding organic thin films exhibiting apparent circular dichroism (ACD), an optical phenomenon based on 2D chirality.
- Tzu-Ling Chen
- , Andrew Salij
- & Randall H. Goldsmith
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Article
| Open AccessOnion-like multicolor thermally activated delayed fluorescent carbon quantum dots for efficient electroluminescent light-emitting diodes
Shi et al. report the synthesis of multicolour thermally activated delayed fluorescent carbon dots with 3D onion-like configuration to stabilise the triplet state and reduce the singlet-triplet energy gap. LEDs with EQE of 6.0–9.9% are achieved, a step further for efficient and stable displays.
- Yuxin Shi
- , Yang Zhang
- & Louzhen Fan
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Article
| Open AccessA metasurface-based full-color circular auto-focusing Airy beam transmitter for stable high-speed underwater wireless optical communications
Authors present an adaptive underwater optical communication (UWOC) technology based on multi-wavelength lasers and a full-color metasurface for converting visible-band Gaussian to circular autofocusing Airy beams. The potential of Airy beams to mitigate optical power degradation is demonstrated, enabling stable data rate transmission via 4 K video transmission for these systems.
- Junhui Hu
- , Zeyuan Guo
- & Chao Shen
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Article
| Open AccessExperimentally realized physical-model-based frugal wave control in metasurface-programmable complex media
Using a compact physics-based model, the authors experimentally achieve coherent wave control in metasurface-programmable complex systems with surprisingly frugal protocols (e.g., without ever measuring phase).
- Jérôme Sol
- , Hugo Prod’homme
- & Philipp del Hougne
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Article
| Open AccessLarge area single crystal gold of single nanometer thickness for nanophotonics
2D metallic single crystals are sought after for nanophotonic applications, but their synthesis remains challenging. Here, the authors report an atomic level precision etching method to fabricate large-area crystalline gold flakes with nanometre thickness, showing enhanced plasmonic and nonlinear optical properties.
- Chenxinyu Pan
- , Yuanbiao Tong
- & Pan Wang
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| Open AccessDynamic switching from coherent perfect absorption to parametric amplification in a nonlinear spoof plasmonic waveguide
The authors propose a nonlinear spoof plasmonic waveguide to realize coherent perfect absorption and parametric amplification at the same frequency, which opens a new route to actively modulate the electromagnetic waves with giant amplification-to-absorption contrast.
- Wen Yi Cui
- , Jingjing Zhang
- & Tie Jun Cui
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Article
| Open AccessHyperbolic metamaterial empowered controllable photonic Weyl nodal line semimetals
One-dimensional photonic crystals provide a platform to modulate Weyl quasiparticles with properties of bound states in the continuum both dynamically (transition and rotation) and topologically (singularities in bilateral drumhead surface states).
- Shengyu Hu
- , Zhiwei Guo
- & Hong Chen
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Article
| Open AccessMonolithic back-end-of-line integration of phase change materials into foundry-manufactured silicon photonics
The foundry-compatible platform could facilitate integration of phase change materials for reconfigurable photonics and open up the possibility of integrating excellent optoelectronic materials into future silicon photonic process design kits.
- Maoliang Wei
- , Kai Xu
- & Hongtao Lin
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| Open AccessMachine-learning-assisted and real-time-feedback-controlled growth of InAs/GaAs quantum dots
Finding the process parameters in molecular beam epitaxy for a specific density of quantum dots is a multidimensional optimization challenge. Here, the authors demonstrate real-time feedback controlled self-assembled InAs/GaAs QDs growth based on machine learning (ML) outputs.
- Chao Shen
- , Wenkang Zhan
- & Zhanguo Wang
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Article
| Open AccessQuantifying the interfacial triboelectricity in inorganic-organic composite mechanoluminescent materials
Mechanoluminescence enables sensing applications of mechanical stimuli. Here, the authors reveal the importance of interfacial triboelectricity to this phenomenon in inorganic-organic composite materials.
- Xin Pan
- , Yixi Zhuang
- & Rong-Jun Xie
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Article
| Open AccessHigh-security learning-based optical encryption assisted by disordered metasurface
In this work, the employment of disordered metasurface as an ultra-stable and actively polarized speckle generator in a passive manner, coupled with a double-secure treatment to the plaintext, enables a highly secure speckle-based cryptosystem.
- Zhipeng Yu
- , Huanhao Li
- & Puxiang Lai
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Article
| Open AccessAmber rainbow ribbon effect in broadband optical metamaterials
The researchers showcased a negative Goos-Hänchen effect in film samples across the entire visible spectrum and discovered an amber rainbow ribbon and an optical black hole where little light leaks out due to perfect back reflection.
- Jing Zhao
- , Xianfeng Wu
- & Xiaopeng Zhao
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| Open AccessLarge exchange-driven intrinsic circular dichroism of a chiral 2D hybrid perovskite
Li et al. report large circular dichroism in 2D chiral perovskite single crystals, arises from the inorganic sublattice, instead of chiral ligands, driven by electron-hole exchange interactions. This is evidenced by both reflective circular dichroism spectroscopy and ab initio theory.
- Shunran Li
- , Xian Xu
- & Peijun Guo
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Article
| Open AccessUltrafast all-optical second harmonic wavefront shaping
Enhancing the data encoding into the orbital angular momentum of light beams could enable faster and more efficient optical communications. This work demonstrates complex control of the second harmonic wavefront with dynamics solely limited by the pulse duration.
- Artem Sinelnik
- , Shiu Hei Lam
- & Isabelle Staude
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Article
| Open AccessTwisted photonic Weyl meta-crystals and aperiodic Fermi arc scattering
Fermi arcs show unpredictable diffraction features resulting from their long-range scattering order in aperiodic systems. Here, authors continuously twist a bi-block Weyl meta-crystal and experimentally observe the twisted Fermi arc reconstruction.
- Hanyu Wang
- , Wei Xu
- & Biao Yang
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Article
| Open AccessPoincaré sphere trajectory encoding metasurfaces based on generalized Malus’ law
Polarization serves as an excellent information encoding carrier. Here, authors expand the metasurface encoding dimensionality of polarization information by engineering the Poincaré Sphere trajectory with generalized Malus’ law, unveiling new opportunities for advanced polarization optics.
- Zi-Lan Deng
- , Meng-Xia Hu
- & Andrea Alù
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Article
| Open AccessPhotooxidation triggered ultralong afterglow in carbon nanodots
Biocompatible afterglow materials have potential in imaging applications, but are challenging to prepare. Here the authors report the development of carbon nanodots with near-infrared afterglow, and demonstrate their use in imaging for tumour resection.
- Guang-Song Zheng
- , Cheng-Long Shen
- & Chong-Xin Shan
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Article
| Open AccessAnomalous and Chern topological waves in hyperbolic networks
Here the authors experimentally demonstrate the anomalous and Chern topological phases in a hyperbolic non-reciprocal scattering network, establishing unidirectional channels to induce new and exciting wave transport properties in curved spaces.
- Qiaolu Chen
- , Zhe Zhang
- & Romain Fleury
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Article
| Open AccessCompact terahertz harmonic generation in the Reststrahlenband using a graphene-embedded metallic split ring resonator array
Compact sources in the frequency range of 6-12 THz are difficult to obtain due to optical phonon absorption in conventional III-V semiconductors. Here, the authors demonstrate third harmonic generation at 9.63 THz by optically pumping monolayer graphene coupled to a circular split ring resonator by using a semiconductor laser.
- Alessandra Di Gaspare
- , Chao Song
- & Miriam S. Vitiello
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Article
| Open AccessBroadband angular spectrum differentiation using dielectric metasurfaces
Metasurfaces processing incoming images have been proposed in the context of real space operations. Here, the authors demonstrate mathematical operations, such as differentiation, on the angular spectrum of an image using metasurfaces, which can be used to enhance spectral features of an image.
- Ming Deng
- , Michele Cotrufo
- & Lin Chen
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Article
| Open AccessSelenium substitution for dielectric constant improvement and hole-transfer acceleration in non-fullerene organic solar cells
Dielectric constant of non-fullerene acceptors plays a critical role in organic solar cells in terms of exciton dissociation and charge recombination. Here, authors report selenium substitution on central core of acceptors to improve dielectric constant, realizing devices with efficiency of 19.0%.
- Xinjun He
- , Feng Qi
- & Wallace C. H. Choy
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Article
| Open AccessWandering principal optical axes in van der Waals triclinic materials
Principal optical axes define light-matter interactions in crystals and they are usually assumed to be stationary. Here, the authors report the observation of wavelength-dependent principal optical axes in ternary van der Waals crystals (ReS2 and ReSe2), leading to wavelength-switchable propagation directions of their waveguide modes.
- Georgy A. Ermolaev
- , Kirill V. Voronin
- & Kostya S. Novoselov