Featured
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News & Views |
Chameleon graphene surfaces
The unique optical properties of graphene were combined with lithium-ion battery technology to produce multispectral optical devices, with colour-changing capabilities.
- Andrea C. Ferrari
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Article |
Mid-infrared semimetal polarization detectors with configurable polarity transition
Mid-infrared polarization detectors based on nanoantenna-mediated few-layer graphene are demonstrated. By tuning the orientation of nanoantennas, the polarization ratios vary from positive to negative, and cover values from 1 to ∞/−∞ then to −1.
- Jingxuan Wei
- , Cheng Xu
- & Chengkuo Lee
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Letter |
Giant enhancement of optical nonlinearity in two-dimensional materials by multiphoton-excitation resonance energy transfer from quantum dots
A simple coating of a sub-200-nm-thick quantum dot film on two-dimensional materials can drastically enhance their nonlinear optical responses through nonlinear-excitation resonance energy transfer by a high-efficiency remote dipole–dipole coupling.
- Hao Hong
- , Chunchun Wu
- & Jie Xiong
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Article |
Room-temperature electron spin polarization exceeding 90% in an opto-spintronic semiconductor nanostructure via remote spin filtering
An electron spin polarization of 90% is achieved in a non-magnetic nanostructure at room temperature without magnetic field. This is accomplished by remote spin filtering of InAs quantum-dot electrons via an adjacent tunnelling-coupled GaNAs spin filter.
- Yuqing Huang
- , Ville Polojärvi
- & Weimin M. Chen
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Article |
Composite fast scintillators based on high-Z fluorescent metal–organic framework nanocrystals
Composites of fluorescent metal–organic framework nanocrystals in a polymer are exploited to create fast scintillators with a rise time of about 50 ps.
- J. Perego
- , I. Villa
- & A. Monguzzi
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Article |
Suppression of temperature quenching in perovskite nanocrystals for efficient and thermally stable light-emitting diodes
Fluoride-treated CsPbBr3 nanocrystals emit light with near unity efficiency at temperatures of up to 373 K.
- Mingming Liu
- , Qun Wan
- & Liang Li
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Article |
Comprehensive defect suppression in perovskite nanocrystals for high-efficiency light-emitting diodes
Guanidinium doping is shown to enhance the operation of perovskite nanocrystal light-emitting diodes.
- Young-Hoon Kim
- , Sungjin Kim
- & Tae-Woo Lee
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Letter |
Optical parametric amplification by monolayer transition metal dichalcogenides
Single-pass optical parametric amplification is demonstrated following propagation though an atomically thin semiconducting transition metal dichalcogenide. The demonstration may lead to atom-sized tunable light sources.
- Chiara Trovatello
- , Andrea Marini
- & Giulio Cerullo
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Article |
NIR II-responsive photon upconversion through energy migration in an ytterbium sublattice
An ytterbium sublattice in an erbium-sensitized multilayer core–shell structure enables photon upconversion from lanthanide ions under 1,530 nm irradiation.
- Bo Zhou
- , Long Yan
- & Qinyuan Zhang
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Letter |
Extreme ionization of heavy atoms in solid-density plasmas by relativistic second-harmonic laser pulses
Gold atoms were stripped of up to 72 electrons by irradiating gold foils and nanowire arrays with a relativistic 400 nm laser pulse. This work will open the door to the study of the atomic physics of highly charged atoms in very-high-density plasmas.
- R. Hollinger
- , S. Wang
- & J. J. Rocca
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Article |
Strain-engineered high-responsivity MoTe2 photodetector for silicon photonic integrated circuits
A strain-induced absorption-enhanced MoTe2-based silicon photonic microring-integrated photodetector is demonstrated, featuring high responsivity of ~0.5 A W–1 at 1,550 nm, with a low noise-equivalent power of 90 pW Hz–0.5.
- R. Maiti
- , C. Patil
- & V. J. Sorger
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Letter |
Unidirectional luminescence from InGaN/GaN quantum-well metasurfaces
Exploiting two-dimensional metamaterials, the direction of emission from InGaN/GaN quantum wells is engineered while simultaneously improving quantum efficiency.
- Prasad P. Iyer
- , Ryan A. DeCrescent
- & Jon. A. Schuller
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News & Views |
Strain creates a trion factory
Exciton funnelling due to non-homogeneous strain was previously thought of as an efficient neutral exciton transport mechanism. New findings suggest that exciton funnelling might be negligible compared with another strain-dependent process, the conversion of neutral excitons into trions.
- Riccardo Frisenda
- & Andres Castellanos-Gomez
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News & Views |
Superfast photon counting
The news that superconducting nanowire detectors can detect single photons with a timing precision of just a few picoseconds will benefit applications ranging from sensing to quantum communications.
- Robert H. Hadfield
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News & Views |
Towards low-loss photonics
Low-loss composite systems based on integrating transition metal dichalcogenide monolayers on silicon nitride waveguides exhibit an unexpectedly strong electro-refractive response at near-infrared wavelengths, which is crucial for optical communications.
- Sylvia Xin Li
- & Michael S. Strano
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News & Views |
Deep-blue carbon dots offer high colour purity
Carbon-dot-based light-emitting diodes with narrowband efficient emission in the deep blue are an attractive candidate for future high-colour-purity flat-panel display and lighting applications.
- Biao Zhao
- , Zhibin Wang
- & Zhan’ao Tan
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Article |
Low-loss composite photonic platform based on 2D semiconductor monolayers
Strong electrorefractive effects in semiconductor transition metal dichalcogenides (TMDs) at near-infrared wavelengths, where the TMDs are transparent, are observed and used to demonstrate photonic devices based on a composite SiN–TMD platform with large phase modulation, minimal induced loss and low electrical power consumption.
- Ipshita Datta
- , Sang Hoon Chae
- & Michal Lipson
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Article |
Bright high-colour-purity deep-blue carbon dot light-emitting diodes via efficient edge amination
Deep-blue high-colour-purity light-emitting materials are developed by using amine-based edge passivation. The light-emitting diodes based on the carbon dots exhibit a maximum luminance of 5,240 cd m–2 and an external quantum efficiency of 4%.
- Fanglong Yuan
- , Ya-Kun Wang
- & Edward H. Sargent
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Letter |
Reversible 3D laser printing of perovskite quantum dots inside a transparent medium
Luminescent CsPbBr3 quantum dots can be written into glass using femtosecond laser pulses and thermal annealing, and erased by further femtosecond laser irradiation. The resulting quantum dot patterns could prove useful for data storage, decoration or security purposes.
- Xiongjian Huang
- , Qianyi Guo
- & Guoping Dong
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Review Article |
Future and challenges for hybrid upconversion nanosystems
The prospects for improving photon upconversion systems by combining organic dyes and inorganic nanoparticles are reviewed.
- Shihui Wen
- , Jiajia Zhou
- & Dayong Jin
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Letter |
Graphene-based metal-induced energy transfer for sub-nanometre optical localization
Using graphene as the ‘metal’ layer can increase the localization accuracy of metal-induced energy transfer, enabling axial localization of single emitters and measurement of the thickness of lipid bilayers with ångström accuracy.
- Arindam Ghosh
- , Akshita Sharma
- & Jörg Enderlein
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Letter |
Graphene photonic crystal fibre with strong and tunable light–matter interaction
A hybrid material based on uniform graphene on both the outer surface and inner hole walls of a photonic crystal fibre offers a strong, tunable light–matter interaction and good broadband electro-optic modulation performance under low gate voltage.
- Ke Chen
- , Xu Zhou
- & Zhongfan Liu
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News & Views |
Overcoming the colour barrier
High-efficiency, time-domain, near-infrared fluorophores provide multiplexed colour channels for distinct deep bioimaging.
- Shoujun Zhu
- & Xiaoyuan Chen
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Letter |
Valley optomechanics in a monolayer semiconductor
Transduction of valley information to mechanical states in a monolayer MoS2 resonator can be realized by optically pumping the valley carriers and applying an out-of-plane magnetic field gradient to induce a displacement-dependent valley splitting.
- Hao-Kun Li
- , King Yan Fong
- & Xiang Zhang
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Letter |
High-sensitivity imaging of time-domain near-infrared light transducer
By time-shifting short-pulse excitation photon energy into prolonged luminescent emission in the time domain, both the number of light signal transducers in sub-15 nm nanoparticles and the near-infrared-in to near-infrared-out conversion efficiency can be maximized, advancing in vivo optical bioimaging.
- Yuyang Gu
- , Zhiyong Guo
- & Fuyou Li
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Article |
Coherent steering of nonlinear chiral valley photons with a synthetic Au–WS2 metasurface
By entangling the phase and spin of light, a synthetic metasurface is shown to be able to coherently manipulate the valley-exciton-locked chiral emission in monolayer tungsten disulfide at room temperature. The findings will be of benefit to advanced room-temperature and free-space nonlinear, quantum and valleytronic nanodevices.
- Guangwei Hu
- , Xuanmiao Hong
- & Cheng-Wei Qiu
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Letter |
Tunable plasmons in ultrathin metal films
Nanometre thick metal films enable electrical tuning of plasmons.
- Rinu Abraham Maniyara
- , Daniel Rodrigo
- & Valerio Pruneri
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Article |
Dual-band infrared imaging using stacked colloidal quantum dot photodiodes
Colloidal quantum dot detectors, switchable between short-wave infrared and mid-wave infrared, are demonstrated.
- Xin Tang
- , Matthew M. Ackerman
- & Philippe Guyot-Sionnest
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Article |
Polarization switching and electrical control of interlayer excitons in two-dimensional van der Waals heterostructures
A device capable of inverting the polarization of light by efficient control of interlayer excitons in a van der Waals heterostructure is demonstrated, representing an important step towards implementing logic operations in valleytronics.
- Alberto Ciarrocchi
- , Dmitrii Unuchek
- & Andras Kis
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Article |
High-efficiency perovskite–polymer bulk heterostructure light-emitting diodes
Near-infrared perovskite–polymer light-emitting diodes (LEDs) with external quantum efficiencies of up to 20.1% are reported.
- Baodan Zhao
- , Sai Bai
- & Dawei Di
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Article |
Nano-optic endoscope for high-resolution optical coherence tomography in vivo
A metalens is integrated into the design of an endoscopic optical coherence tomography catheter to achieve near-diffraction-limited imaging free of non-chromatic aberrations, offering high-resolution imaging well beyond the Rayleigh range of the input field.
- Hamid Pahlevaninezhad
- , Mohammadreza Khorasaninejad
- & Melissa J. Suter
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News & Views |
The heat is on
The generation of hot electrons in plasmonic nanostructures is of scientific and technological interest, putting the community under pressure to better understand the hot-electron mechanisms and to increase the light conversion efficiency of plasmonic nanosystems for chemical reactions and photodetection.
- Rachel Won
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Review Article |
Light–valley interactions in 2D semiconductors
Valleytronics in single-layer semiconductors is reviewed with an emphasis on controlling the valley degree of freedom with light as well as potential applications.
- Kin Fai Mak
- , Di Xiao
- & Jie Shan
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News & Views |
Electrically tuned nonlinearity
The demonstration of broadband, electrically tunable third-order nonlinear optical responses in graphene is promising for a host of nonlinear optical applications.
- Zhipei Sun
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Letter |
Experimental observation of a polarization vortex at an optical bound state in the continuum
Previous predictions that light radiated by modes around a bound state in the continuum (BIC) condition should exhibit a vortex in the far-field polarization profile are experimentally confirmed. The findings shed light on the origin of BICs.
- Hugo M. Doeleman
- , Francesco Monticone
- & A. Femius Koenderink
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Article |
Enrichment of molecular antenna triplets amplifies upconverting nanoparticle emission
Lanthanide-doped upconverting nanoparticles exhibiting a 33,000 times increase in brightness and a 100 times increase in efficiency over bare upconverting nanoparticles are demonstrated. The findings are relevant in fields from solar energy to biophotonics.
- David J. Garfield
- , Nicholas J. Borys
- & P. James Schuck
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Article |
Silicon Mie resonators for highly directional light emission from monolayer MoS2
Based on a modified Mie scattering theory, several pathways to achieve control over the directionality, polarization state and spectral emission that rely on a coherent coupling of an emitting dipole in monolayer MoS2 to optical resonances of a silicon nanowire are reported.
- Ahmet Fatih Cihan
- , Alberto G. Curto
- & Mark L. Brongersma
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Article |
Opto-thermoelectric nanotweezers
Heating due to optical losses in metal nanoparticles, which is usually an unwanted side effect, is harnessed to realize low-power opto-thermoelectric nanotweezers.
- Linhan Lin
- , Mingsong Wang
- & Yuebing Zheng
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Letter |
Femtosecond X-ray Fourier holography imaging of free-flying nanoparticles
Femtosecond X-ray Fourier holography imaging with record-high lateral resolution below 20 nm is demonstrated. Phase information is encoded into the interference of the diffraction patterns of a reference particle with a measurement sample.
- Tais Gorkhover
- , Anatoli Ulmer
- & Christoph Bostedt
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Letter |
Activation of the surface dark-layer to enhance upconversion in a thermal field
Phonons on the surface of lanthanide-doped upconversion materials are used to combat thermal quenching, enabling ~2,000-fold emission enhancement.
- Jiajia Zhou
- , Shihui Wen
- & Dayong Jin
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News & Views |
Highly efficient nanoscale X-ray sources
Irradiating arrays of metal nanowires with intense femtosecond laser pulses produces high-brightness picosecond X-ray pulses. By specifically tailoring the plasma properties, up to 20% conversion efficiency of optical light into X-rays can be achieved.
- Daniel Rolles
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News & Views |
Optical nanoscopy turns coherent
The ability to switch fluorophores on and off is key to performing super-resolution nanoscopy. To date, all switching schemes have been based on an incoherent response to the laser field. Now, a nanoscope that uses on–off coherent switching of quantum dots has been demonstrated.
- Thomas A. Klar
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Article |
Active tuning of surface phonon polariton resonances via carrier photoinjection
Infrared surface phonon polariton tuning is achieved by photoinjecting free carriers into resonators.
- Adam D. Dunkelberger
- , Chase T. Ellis
- & Joshua D. Caldwell
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Letter |
Broadband gate-tunable terahertz plasmons in graphene heterostructures
An all-optical difference frequency process is exploited to generate terahertz graphene plasmons that are tunable over an octave.
- Baicheng Yao
- , Yuan Liu
- & Chee Wei Wong
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