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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 |
Photonic crystal optical parametric oscillator
Photonic crystal-based optical parametric oscillators have remained elusive but have finally been demonstrated. Operating at telecom wavelengths, the source may prove particularly useful in quantum optics applications.
- Gabriel Marty
- , Sylvain Combrié
- & Alfredo De Rossi
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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 |
Quantitative sampling of atomic-scale electromagnetic waveforms
Ultrafast lightwave sampling based on scanning tunnelling microscopy is developed to resolve near fields with sub-picosecond time resolution and sub-nanometre spatial resolution. Parameter-free quantitative measurement is achieved by using a single-molecule switch.
- D. Peller
- , C. Roelcke
- & J. Repp
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Article |
High-power portable terahertz laser systems
GaAs-based terahertz quantum cascade lasers emitting around 4 THz are demonstrated up to 250 K without a magnetic field. To elevate the operation temperature, carrier leakage channels are reduced by carefully designing the quantum well structures.
- Ali Khalatpour
- , Andrew K. Paulsen
- & Qing Hu
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Letter |
Transient optical symmetry breaking for ultrafast broadband dichroism in plasmonic metasurfaces
Inhomogeneity of the photogenerated carrier spacetime distribution enables transient symmetry breaking in a metasurface. As a result, broadband transient dichroism is demonstrated.
- Andrea Schirato
- , Margherita Maiuri
- & Giuseppe Della Valle
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Review Article |
Deep learning for the design of photonic structures
The application of deep learning to the design of photonic structures and devices is reviewed, including algorithm fundamentals.
- Wei Ma
- , Zhaocheng Liu
- & Yongmin Liu
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Article |
Sub-nanometre resolution in single-molecule photoluminescence imaging
Through the use of a plasmon-active atomically sharp tip and an ultrathin insulating film, and precise junction control in a highly confined nanocavity plasmon field at the scanning tunnelling microscope junction, sub-nanometre-resolved single-molecule near-field photoluminescence imaging with a spatial resolution down to ∼8 Å is achieved.
- Ben Yang
- , Gong Chen
- & J. G. Hou
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News & Views |
Super-resolution microscopy on a photonic chip
Using a photonic chip to generate the patterns of light needed for structured illumination microscopy could reduce the cost and complexity of super-resolution imaging.
- Sara Abrahamsson
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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 |
Strong mid-infrared photoresponse in small-twist-angle bilayer graphene
Owing to the superlattice-induced bandgap and superlattice-enhanced density of states, small-twist-angled (<2°) bilayer graphene exhibits a strong gate-tunable photoresponse in the mid-infrared regime of 5 to 12 μm, reaching an extrinsic peak responsivity of 26 mA W−1 at 12 μm.
- Bingchen Deng
- , Chao Ma
- & Fengnian Xia
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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 |
Two-dimensional optical edge detection
Using a photonic crystal slab combined with a conventional optical imaging system, a two-dimensional optical image differentiator is experimentally demonstrated for edge detection.
- Wei Yan
- & Min Qiu
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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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Article |
Exciton resonance tuning of an atomically thin lens
By harnessing the excitonic resonances of a monolayer of WS2 in the visible spectral range, large-area, actively tunable and atomically thin optical lenses can be realized.
- Jorik van de Groep
- , Jung-Hwan Song
- & Mark L. Brongersma
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Article |
Demonstration of sub-3 ps temporal resolution with a superconducting nanowire single-photon detector
Knowledge about detection latency provides a guideline to reduce the timing jitter of niobium nitride superconducting nanowire single-photon detectors. A timing jitter of 2.6 ps at visible wavelength and 4.3 ps at 1,550 nm is achieved.
- Boris Korzh
- , Qing-Yuan Zhao
- & Karl K. Berggren
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Letter |
Luminescent surfaces with tailored angular emission for compact dark-field imaging devices
A luminescent photonic substrate with a controlled angular emission profile is introduced and its ability to generate high-contrast dark-field images of micrometre-sized living organisms is demonstrated using standard optical microscopy equipment.
- Cécile A. C. Chazot
- , Sara Nagelberg
- & Mathias Kolle
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Letter |
Ranging and light field imaging with transparent photodetectors
A highly transparent photodetector using graphene as the light-sensing layer, conducting channel layer, gate layer and interconnects enables new approaches for light field photodetection and imaging involving simultaneous detection across multiple focal planes.
- Miao-Bin Lien
- , Che-Hung Liu
- & Theodore B. Norris
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Letter |
Efficient near-infrared light-emitting diodes based on quantum dots in layered perovskite
Embedding perovskite quantum dots in perovskite leads to bright, efficient 980 nm LEDs with applications in imaging and sensing.
- Liang Gao
- , Li Na Quan
- & Edward H. Sargent
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Article |
4H-silicon-carbide-on-insulator for integrated quantum and nonlinear photonics
Monolithic photonics devices based on SiC are fabricated by a wafer bonding and thinning technique. The strong enhancement of single-photon emission from a colour centre and optical frequency conversion with an efficiency of 360% W−1 are demonstrated.
- Daniil M. Lukin
- , Constantin Dory
- & Jelena Vučković
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Article |
Spectral super-resolution spectroscopy using a random laser
Spectral super-resolution spectroscopy is realized by exploiting a random laser that chaotically produces sharply spiked spectral lines, representing a new generation of simple, compact and cost-effective spectroscopy tools.
- Alice Boschetti
- , Andrea Taschin
- & Diederik S. Wiersma
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News & Views |
Graphene boost
Using graphene as the ‘metal’ layer improves the localization accuracy of metal-induced energy transfer by nearly tenfold.
- Margarida M. Barroso
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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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Article |
An integrated broadband spectrometer on thin-film lithium niobate
By exploiting the electro-optic properties of thin-film lithium niobate, an integrated single-waveguide Fourier transform spectrometer with a footprint of <10 mm2 and an operational bandwidth of 500 nm in the near- and short-wavelength infrared is demonstrated.
- David Pohl
- , Marc Reig Escalé
- & Rachel Grange
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Letter |
Hot-electron emission processes in waveguide-integrated graphene
Unusual photoemission from graphene is explained by the emission of hot electrons. The findings may lead to integrated photonic devices driven by hot-electron emission.
- Fatemeh Rezaeifar
- , Ragib Ahsan
- & Rehan Kapadia
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Letter |
Corner states of light in photonic waveguides
Higher-order topologically protected states, localized to corners of photonic waveguide arrays, are experimentally demonstrated.
- Ashraf El Hassan
- , Flore K. Kunst
- & Mohamed Bourennane
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Comment |
Remembering Zhores Alferov
Father of the semiconductor laser, Nobel Prize laureate and director of the Ioffe Institute in St Petersburg, Zhores Alferov was a much-loved scientist and educator whose research changed the modern world.
- Sergey Ivanov
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Review Article |
Brillouin integrated photonics
Acousto-optical interactions within integrated optics platforms are reviewed with a discussion of the useful chip-based devices such as lasers, amplifiers, filters, isolators and more besides that can result.
- Benjamin J. Eggleton
- , Christopher G. Poulton
- & Gaurav Bahl
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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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Letter |
THz-to-optical conversion in wireless communications using an ultra-broadband plasmonic modulator
A high-speed wireless THz communication link is seamlessly integrated into a fibre-optic network. The demonstration relies on an ultra-broadband modulator exploiting two-dimensionally localized gap plasmons for direct conversion of the THz signals to the optical domain.
- S. Ummethala
- , T. Harter
- & C. Koos
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Article |
High external-efficiency nanofocusing for lens-free near-field optical nanoscopy
A two-step sequential broadband nanofocusing technique offers an external efficiency of ~50% over nearly all the visible range on a fibre-coupled plasmonic nanowire probe. Its integration with a scanning tunnelling microscope realizes lens-free tip-enhanced Raman spectroscopy with 1 nm spatial resolution.
- Sanggon Kim
- , Ning Yu
- & Ruoxue Yan
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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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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 |
A 90-nm-thick graphene metamaterial for strong and extremely broadband absorption of unpolarized light
Eighty-five per cent absorptivity of unpolarized light over the wavelength range 300–2,500 nm is realized in a 90-nm-thick, 12.5 cm2 metamaterial.
- Han Lin
- , Björn C. P. Sturmberg
- & Baohua Jia
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Letter |
Spectrotemporal shaping of itinerant photons via distributed nanomechanics
Optomechanical coupling enables an on-chip frequency comb and optical time-lens for 70-fold optical pulse compression.
- Linran Fan
- , Chang-Ling Zou
- & Hong X. Tang
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Article |
Anisotropic structural dynamics of monolayer crystals revealed by femtosecond surface X-ray scattering
Electron–phonon coupling in a monolayer WSe2 on a substrate is investigated by femtosecond surface X-ray scattering. Counterintuitively, the absorbed optical photon energy is dominantly coupled to the in-plane lattice vibrations within 1 ps.
- I-Cheng Tung
- , Aravind Krishnamoorthy
- & Haidan Wen
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Article |
Visible quantum dot light-emitting diodes with simultaneous high brightness and efficiency
Red, green and blue CdSe/ZnSe quantum dot light-emitting diodes combine efficient operation with high brightness.
- Huaibin Shen
- , Qiang Gao
- & Zhenyu Zhang
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Article |
Separation of valley excitons in a MoS2 monolayer using a subwavelength asymmetric groove array
Helicity of photons is exploited for preferential emission direction and sorting of valley-polarized excitons is achieved at room temperature.
- Liuyang Sun
- , Chun-Yuan Wang
- & Xiaoqin Li
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Letter |
Electron–hole liquid in a van der Waals heterostructure photocell at room temperature
Photoexcited charge carriers are typically approximated as a gas, but now it is shown that electrons and holes can behave as a liquid in MoTe2 photocells.
- Trevor B. Arp
- , Dennis Pleskot
- & Nathaniel M. Gabor
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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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Letter |
Microwave plasmonic mixer in a transparent fibre–wireless link
A direct wireless-to-optical receiver in a transparent optical link is achieved, thanks to a subwavelength two-dimensionally localized gap-plasmon mixer encoding wireless information directly onto optical signals.
- Y. Salamin
- , B. Baeuerle
- & J. Leuthold
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Letter |
Nanophotonic optical gyroscope with reciprocal sensitivity enhancement
An integrated silicon photonic optical gyroscope achieves two orders of magnitude size reduction and a factor of thirty better phase-shift sensitivity using reciprocal sensitivity enhancement.
- Parham P. Khial
- , Alexander D. White
- & Ali Hajimiri
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Article |
Anion-exchange red perovskite quantum dots with ammonium iodine salts for highly efficient light-emitting devices
Perovskite quantum dots (QDs) are synthesized via an anion-exchange process where CsPbBr3 is used to realize a highly efficient red light-emitting diode (LED). The perovskite QD-based LED exhibits the highest external quantum efficiency of more than 20% compared with perovskite LEDs.
- Takayuki Chiba
- , Yukihiro Hayashi
- & Junji Kido
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Article |
Terahertz dynamics of electron–vibron coupling in single molecules with tunable electrostatic potential
Terahertz (THz) spectroscopy based on a single-molecule transistor detects a THz-induced centre-of-mass oscillation of a fullerene molecule. Its sensitivity is so high that the spectrum changes on adding (removing) an electron to (from) the molecule.
- Shaoqing Du
- , Kenji Yoshida
- & Kazuhiko Hirakawa
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Article |
Single upconversion nanoparticle imaging at sub-10 W cm−2 irradiance
This systematic study of upconversion nanoparticles reveals power-dependent luminescence and paves the way towards ideal single-molecule and cellular probes.
- Qian Liu
- , Yunxiang Zhang
- & Steven Chu
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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