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Article
| Open Access
Integrated photodetectors for compact Fourier-transform waveguide spectrometers
A Fourier-transform waveguide spectrometer is demonstrated by using HgTe-quantum-dot-based photoconductors with a spectral response up to a wavelength of 2 μm. The spectral resolution is 50 cm–1. The total active spectrometer volume is below 100 μm × 100 μm × 100 μm.
- Matthias J. Grotevent
- , Sergii Yakunin
- & Ivan Shorubalko
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Article |
Excitonic resonances control the temporal dynamics of nonlinear optical wave mixing in monolayer semiconductors
Researchers show that resonant coupling of light pulses with excitonic transitions affects the optimal time difference between pulses for sum-frequency generation and four-wave mixing in monolayer WSe2.
- Jonas M. Bauer
- , Lijue Chen
- & Kai-Qiang Lin
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Article |
Light-sheet 3D microprinting via two-colour two-step absorption
High-speed, high-resolution optics-based printing typically requires femtosecond pulsed lasers. We demonstrate optical printing using indigo-blue laser diodes and a red continuous-wave laser, achieving a peak printing rate of 7 × 106 voxels s–1 at a voxel volume of 0.55 µm3.
- Vincent Hahn
- , Pascal Rietz
- & Martin Wegener
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Article |
Room-temperature upconverted superfluorescence
Under near-infrared-light excitation, anti-Stokes-shift superfluorescence is observed near 590 nm at room temperature in a medium of lanthanide-doped upconversion nanoparticles. The spectral width and radiative decay lifetime are 2 nm and 46 ns, respectively, in the single-nanoparticle case.
- Kai Huang
- , Kory Kevin Green
- & Shuang Fang Lim
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Letter |
High-efficiency and broadband on-chip electro-optic frequency comb generators
A double-ring-resonator device on thin-film lithium niobate enables the generation of electro-optic frequency combs with a 30% power efficiency and an optical span of 132 nm.
- Yaowen Hu
- , Mengjie Yu
- & Marko Lončar
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Article |
Towards compact phase-matched and waveguided nonlinear optics in atomically layered semiconductors
Researchers demonstrate efficient frequency conversion with rhombohedral MoS2. A second-harmonic-generation coherence length of ~530 nm at 1,520 nm wavelength and giant nonlinear optical enhancement in waveguide geometries are reported.
- Xinyi Xu
- , Chiara Trovatello
- & P. James Schuck
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Article |
Ultrastable near-infrared perovskite light-emitting diodes
Near-infrared perovskite light-emitting diodes with extrapolated device lifespans on the scale of years are achieved by the use of a dipolar molecular stabilizer.
- Bingbing Guo
- , Runchen Lai
- & Dawei Di
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Article |
Sub-50-ns ultrafast upconversion luminescence of a rare-earth-doped nanoparticle
A tilted plasmonic nanocavity enables shortening of the luminescence decay time of a rare-earth-doped nanoparticle to sub-50 ns. High quantum efficiency enhancement, chiral polarization and directional far-field emission are maintained.
- Huan Chen
- , Zihe Jiang
- & Hongxing Xu
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News & Views |
Giant nonlinearity in upconversion nanoparticles
Co-doping ytterbium and praseodymium ions in photon avalanche nanoparticles rapidly builds up huge optical nonlinearities, enabling confocal microscopy to achieve super-resolution imaging at high speed.
- Chaohao Chen
- & Dayong Jin
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Letter |
Giant effective Zeeman splitting in a monolayer semiconductor realized by spin-selective strong light–matter coupling
Researchers show spin-susceptibility in monolayer MoSe2 and demonstrate giant effective valley Zeeman splitting and nonlinearity for trion-polaritons.
- T. P. Lyons
- , D. J. Gillard
- & A. I. Tartakovskii
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Letter |
Asymmetric parametric generation of images with nonlinear dielectric metasurfaces
Asymmetric parametric generation of light in nonlinear metasurfaces is enabled by nonlinear dielectric resonators in translucent metasurfaces. Upon infrared illumination, different and independent visible light images are detected for ‘forwards’ versus ‘backwards’ operation.
- Sergey S. Kruk
- , Lei Wang
- & Yuri Kivshar
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Article |
Spontaneous-polarization-induced photovoltaic effect in rhombohedrally stacked MoS2
It is shown that rhombohedral stacked MoS2 can enable scalable photovoltaic effects induced by spontaneous polarization throughout few-micrometre-sized exfoliated flakes. This is exploited in a graphene–MoS2-based photovoltaic device.
- Dongyang Yang
- , Jingda Wu
- & Ziliang Ye
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Article |
Solution-processed green and blue quantum-dot light-emitting diodes with eliminated charge leakage
A new strategy to reduce charge leakage in quantum-dot light-emitting diodes enables high external quantum efficiencies of 28.7% and 21.9% and excellent T95 lifetimes of 580,000 h and 4,400 h for green and blue devices, respectively.
- Yunzhou Deng
- , Feng Peng
- & Yizheng Jin
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Article |
Large-scale planar and spherical light-emitting diodes based on arrays of perovskite quantum wires
The use of perovskite quantum-wire light emitters results in high-quality planar and spherical light-emitting diodes.
- Daquan Zhang
- , Qianpeng Zhang
- & Zhiyong Fan
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Article |
Cavity-enhanced linear dichroism in a van der Waals antiferromagnet
Researchers use spin-charge coupling and FePS3 crystals to induce large in-plane optical anisotropy and near-unity linear dichroism in the visible–near-infrared range.
- Huiqin Zhang
- , Zhuoliang Ni
- & Deep Jariwala
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Article |
Chiral phonons in microcrystals and nanofibrils of biomolecules
Chiral phonons—long-range lattice vibrations with rotational motion of atoms—are observed by terahertz chiroptical spectroscopy in biocrystals. Terahertz circular dichroism peaks between 0.2 and 2.0 THz clearly identify the chirality of these phonons in various microcrystalline and nanofibrils of biomolecules.
- Won Jin Choi
- , Keiichi Yano
- & Nicholas A. Kotov
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Article |
Electrically controllable chirality in a nanophotonic interface with a two-dimensional semiconductor
Researchers demonstrate electrically controllable chirality by exploiting doping-dependent valley polarization of excitonic states in monolayer tungsten diselenide.
- Robert Shreiner
- , Kai Hao
- & Alexander A. High
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Article |
Ultrahigh-resolution quantum-dot light-emitting diodes
The demonstration of high-resolution quantum-dot light-emitting diodes by transfer printing could prove useful for next-generation displays.
- Tingtao Meng
- , Yueting Zheng
- & Lei Qian
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News & Views |
Excitons surf the waves
Directional control of the diffusion of excitons is desired for excitonic devices, but being neutrally charged they can’t be transported by applying a bias voltage as for conventional electronic transport. It is now shown that surface acoustic waves can direct the flux of excitons over micrometre distances, even at room temperature.
- Jorge Quereda
- & Andres Castellanos-Gomez
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Article |
Spatiotemporally controlled room-temperature exciton transport under dynamic strain
Researchers exploit Rayleigh waves and associated dynamic strains to control exciton transport in the weak coupling regime at room temperature. The findings may pave the way for new types of excitonic device for applications ranging from communications to energy.
- Kanak Datta
- , Zhengyang Lyu
- & Parag B. Deotare
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Article |
Metasurface-based bijective illumination collection imaging provides high-resolution tomography in three dimensions
A custom-designed metasurface for sample illumination and light collection in optical coherence tomography overcomes the usual trade off in lateral resolution and depth of field.
- Masoud Pahlevaninezhad
- , Yao-Wei Huang
- & Hamid Pahlevaninezhad
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Article |
Electrically driven random lasing from a modified Fabry–Pérot laser diode
Researchers present a cost-effective approach to make electrically driven random lasers, by modifying commercially available laser diodes.
- Antonio Consoli
- , Niccolò Caselli
- & Cefe López
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Article |
Excitonic transport driven by repulsive dipolar interaction in a van der Waals heterostructure
Spatially and temporally resolved exciton diffusion experiments on a two-dimensional WSe2/hBN/MoSe2 heterostructure are reported, where an excitation-power-dependent exciton diffusion pattern is observed and phenomena with dipole–dipole repulsive interaction are quantitatively modelled.
- Zhe Sun
- , Alberto Ciarrocchi
- & Andras Kis
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Article |
High-Q slow light and its localization in a photonic crystal microring
Researchers demonstrate a microring cavity with a photonic crystal on its inside edge, which enables a simultaneous high quality factor (1,000,000) and slow light (10 times slower than for conventional whispering gallery modes). Defect modes with a high quality factor (600,000) and high localizations (20 times smaller) are also enabled.
- Xiyuan Lu
- , Andrew McClung
- & Kartik Srinivasan
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Article |
Electroluminescence from nanocrystals above 2 µm
Near-infrared emission at around 2 µm is observed from HgTe nanocrystals. LEDs based on this material platform could prove to be a useful low-cost, convenient light source for applications in gas sensing and other tasks.
- Junling Qu
- , Mateusz Weis
- & Emmanuel Lhuillier
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Article |
Two-step absorption instead of two-photon absorption in 3D nanoprinting
As an alternative to high-resolution fabrication by two-photon absorption, researchers demonstrate a two-step absorption process that employs inexpensive light sources.
- Vincent Hahn
- , Tobias Messer
- & Martin Wegener
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Review Article |
Landau level laser
Progress on Landau level lasers—based on external magnetic field splitting of electronic states—is reviewed, with particular attention paid to the potential for tunable terahertz lasers.
- Erich Gornik
- , Gottfried Strasser
- & Karl Unterrainer
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Article |
Robust, efficient, micrometre-scale phase modulators at visible wavelengths
Visible-spectrum silicon nitride thermo-optic phase modulators based on adiabatic micro-ring resonators with a small device footprint and low power consumption, of potential use for applications like augmented-/virtual-reality goggles, quantum information processing circuits and optogenetics, are presented.
- Guozhen Liang
- , Heqing Huang
- & Nanfang Yu
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Article |
A photonic integrated quantum secure communication system
Quantum photonic integrated circuits for a standalone quantum secure communication system are developed and packaged into pluggable interconnects. The system is interfaced with 100 Gb s–1 data encryptors and its performance is evaluated over 10 km to 50 km fibre links.
- Taofiq K. Paraïso
- , Thomas Roger
- & Andrew J. Shields
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Letter |
Optomechanical quantum teleportation
Quantum teleportation of a photonic qubit into mechanical modes of two silicon photonic crystal nanobeams is demonstrated. It allows to store and retrieve an arbitrary qubit state onto a dual-rail encoded long-lived optomechanical quantum memory.
- Niccolò Fiaschi
- , Bas Hensen
- & Simon Gröblacher
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Letter |
Solution-processed inorganic perovskite crystals as achromatic quarter-wave plates
Perovskite crystals of Cs4PbBr6 embedded with CsPbBr3 nanocrystals are shown to act as wideband, achromatic waveplates in the visible and near-infrared regions.
- Xiaomei Chen
- , Wen-gao Lu
- & Haizheng Zhong
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Letter |
Solution-processed PbS quantum dot infrared laser with room-temperature tunable emission in the optical telecommunications window
Solution-processed infrared lasers that operate at room temperature are a challenge, but now researchers have achieved such a device using colloidal quantum dots.
- G. L. Whitworth
- , M. Dalmases
- & G. Konstantatos
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Letter |
Anomalous upconversion amplification induced by surface reconstruction in lanthanide sublattices
Strong lanthanide-doped upconversion luminescence enhancement is achieved by the use of surface molecules which enhance four-photon upconversion emission. The results may lead to new, highly emissive, nanohybrid systems.
- Hui Xu
- , Sanyang Han
- & Xiaogang Liu
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Article
| Open Access
All-optical polarization and amplitude modulation of second-harmonic generation in atomically thin semiconductors
All-optical modulation of second-harmonic generation in a monolayer molybdenum disulfide with a modulation depth of close to 100%, and speed limited only by the fundamental pulse duration, is achieved thanks to the crystal symmetry and the deep subwavelength thickness of the sample.
- Sebastian Klimmer
- , Omid Ghaebi
- & Giancarlo Soavi
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Article |
Bright and stable light-emitting diodes made with perovskite nanocrystals stabilized in metal–organic frameworks
The use of metal–organic frameworks helps protect perovskite nanocrystals, resulting in bright, stable light-emitting diodes.
- Hsinhan Tsai
- , Shreetu Shrestha
- & Wanyi Nie
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Review Article |
Prospects and challenges of colloidal quantum dot laser diodes
Colloidal quantum dots may offer solution-processable lasers, with a wide range of colours available. Technical hurdles and progress towards realization of useful quantum dot laser diodes is reviewed.
- Heeyoung Jung
- , Namyoung Ahn
- & Victor I. Klimov
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Article |
Ultra-coherent Fano laser based on a bound state in the continuum
Quantum noise is suppressed by a bound state in the continuum (BIC) approach, enabling a microlaser with narrow linewidth compared to other small lasers.
- Yi Yu
- , Aurimas Sakanas
- & Jesper Mørk
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Article |
Slow carrier relaxation in tin-based perovskite nanocrystals
Tin-based perovskite nanocrystals with slower than usual relaxation dynamics holds promise for superior lead-free perovskite optoelectronic devices.
- Linjie Dai
- , Zeyu Deng
- & Neil C. Greenham
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Article |
Nanoscale atomic suspended waveguides for improved vapour coherence times and optical frequency referencing
A hybrid photonic–atomic device based on the integration of tapered nanoscale and mechanically suspended waveguides with hot vapour is reported, demonstrating a drastic reduction in absorption linewidth and improved vapour coherence time.
- Roy Zektzer
- , Noa Mazurski
- & Uriel levy
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Review Article |
Nanoscale terahertz scanning probe microscopy
Recent progress in terahertz scanning probe microscopy is reviewed with an emphasis on techniques that access length scales below 100 nm relevant to material science. An outlook on the future of nanoscale terahertz scanning probe microscopy is also provided.
- T. L. Cocker
- , V. Jelic
- & F. A. Hegmann
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Correspondence |
Exaggerated sensitivity in photodetectors with internal gain
- Simone Bianconi
- , Lincoln J. Lauhon
- & Hooman Mohseni
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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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News & Views |
Nanoantenna tunnelling currents record laser waves
Tunnelling currents inside plasmonic nanostructures are fast enough to gain direct access to the oscillating electric field of near-infrared and visible light, opening up exciting routes towards attosecond metrology of light–matter interaction and unique approaches to spectroscopy.
- Nicholas Karpowicz
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Matters Arising |
Reconsidering metasurface lasers
- Dandan Wen
- , Jasper J. Cadusch
- & Kenneth B. Crozier
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Article |
A wavelength-scale black phosphorus spectrometer
A single-photodetector spectrometer based on black phosphorus is demonstrated in the wavelength range from 2 to 9 μm. The footprint is 9 × 16 μm2. The spectrometer is free from bulky interferometers and gratings, and is electrically reconfigurable.
- Shaofan Yuan
- , Doron Naveh
- & Fengnian Xia
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Perspective |
Metasurfaces for quantum photonics
Progress in the field of quantum-photonics applications of metasurfaces is reviewed. Cutting-edge research, including the development of optical chips supporting high-dimensional quantum entanglement and advanced quantum tomography, is summarized.
- Alexander S. Solntsev
- , Girish S. Agarwal
- & Yuri S. Kivshar
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Article |
On-chip sampling of optical fields with attosecond resolution
An on-chip, sub-optical-cycle sampling technique for measuring arbitrary electric fields of few-femtojoule near-infrared optical pulses in ambient conditions is demonstrated, offering an improvement of roughly six orders of magnitude in energy sensitivity compared with those previous works in the near-infrared.
- Mina R. Bionta
- , Felix Ritzkowsky
- & Phillip D. Keathley
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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
| Open Access
MINSTED fluorescence localization and nanoscopy
A stimulated-emission-depletion-based fluorescence localization and super-resolution microscopy concept that is capable of attaining a spatial resolution down at the size scale of the fluorophores themselves and a localization precision of 1–3 nm in standard deviation is reported.
- Michael Weber
- , Marcel Leutenegger
- & Stefan W. Hell
Readout-efficient superconducting nanowire single-photon imager with orthogonal time–amplitude multiplexing by hotspot quantization