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| Open AccessOptomechanical ring resonator for efficient microwave-optical frequency conversion
The authors showed a high-efficiency microwave-optical conversion using optomechanical rings where co-resonant traveling photons and phonons induce enhanced interconversion, which enables transduction application in quantum and classical domains.
- I-Tung Chen
- , Bingzhao Li
- & Mo Li
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Article
| Open AccessIntegrated microwave photonic notch filter using a heterogeneously integrated Brillouin and active-silicon photonic circuit
Microwave photonic technologies are poised to revolutionise electronic systems. Here the authors integrate necessary but until now elusive, MHz-level resolution photonic processing with on-chip electro-optic components in a compact microwave photonic notch filter.
- Matthew Garrett
- , Yang Liu
- & Benjamin J. Eggleton
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Article
| Open AccessStrong transient magnetic fields induced by THz-driven plasmons in graphene disks
The authors provide an experimental demonstration of magnetic field generation in graphene disks via the inverse Faraday effect. When the disks are illuminated with circularly polarized radiation in resonance with the graphene plasmon frequency, the corresponding rotational motion of the charge carriers gives rise to a unipolar magnetic field.
- Jeong Woo Han
- , Pavlo Sai
- & Martin Mittendorff
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Article
| Open AccessEnhanced optical conductivity and many-body effects in strongly-driven photo-excited semi-metallic graphite
Strong optical excitation near band extrema can drive novel correlated states. Here the authors report a non-equilibrium many-body state in graphite driven by a strong excitation near van Hove singularity, yielding a tenfold increase in optical conductivity attributed to carrier excitations in the flat bands.
- T. P. H. Sidiropoulos
- , N. Di Palo
- & J. Biegert
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Article
| Open AccessMitigating stimulated Brillouin scattering in multimode fibers with focused output via wavefront shaping
The authors demonstrate a high-power delivery through a highly multimode optical fiber by shaping the incident wavefront of a laser beam to strongly suppress the stimulated Brillouin scattering in the fiber and simultaneously control the output beam profile.
- Chun-Wei Chen
- , Linh V. Nguyen
- & Hui Cao
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Article
| Open AccessVisualizing ultrafast photothermal dynamics with decoupled optical force nanoscopy
Diving deep into material insights, the authors introduce the ‘Decoupled Optical Force Nanoscopy’. This innovation uncovers the physical origins of light induced forces and captures dynamic thermal details with unparalleled nanometer precision.
- Hanwei Wang
- , Sean M. Meyer
- & Yang Zhao
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Article
| Open AccessMetafiber transforming arbitrarily structured light
Structured light has proven useful for numerous photonic applications. However, its current use in optical fibers is severely limited. The authors report a highly integrated metafiber platform based on 3D laser nanoprinting, capable of creating arbitrarily structured light.
- Chenhao Li
- , Torsten Wieduwilt
- & Haoran Ren
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Article
| Open AccessPrediction on X-ray output of free electron laser based on artificial neural networks
Methods to characterize the free-electron laser pulses are evolving and their performances are also improving. Here the authors demonstrate a method based on the artificial neural networks to predict the output pulses of the X-ray free-electron laser by considering the electron beam parameters as input.
- Kenan Li
- , Guanqun Zhou
- & Anne Sakdinawat
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Article
| Open AccessMultipole engineering by displacement resonance: a new degree of freedom of Mie resonance
Mie resonances are typically manipulated through varying nanostructure shape/size. Here, authors found that Gaussian beam displacement excites higher-order multipolar modes, not accessible by plane wave, featuring maximal linear and nonlinear scattering efficiency when the focus is misaligned.
- Yu-Lung Tang
- , Te-Hsin Yen
- & Shi-Wei Chu
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Article
| Open AccessQuantum noise and its evasion in feedback oscillators
Feedback oscillators are a fundamental tool in science and engineering. Here, Loughlin and Sudhir provide a generalized Schawlow-Townes-like formula for quantum-limited feedback oscillators, thus giving a general model to study the fundamental output noise of these devices and techniques to reduce their noise further.
- Hudson A. Loughlin
- & Vivishek Sudhir
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Article
| Open AccessDispersion engineered metasurfaces for broadband, high-NA, high-efficiency, dual-polarization analog image processing
Here the authors demonstrate a path to design metasurfaces that perform broadband, high-NA, high-efficiency and dual-polarization edge detection without using bulky 4 f systems. This work introduces new approaches towards passive, ultra-compact optical computing and image processing.
- Michele Cotrufo
- , Akshaj Arora
- & Andrea Alù
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Article
| Open AccessEfficient ultrafast field-driven spin current generation for spintronic terahertz frequency conversion
Terahertz frequencies offer the potential of much higher data transfer rates, but this requires devices able to generate and manipulate terahertz waves. One approach is to utilize the spin dynamics of a magnetic system. Here, Ilyakov et al. show how a multilayer magnetic and heavy-metal heterostructure can be used to achieve terahertz second harmonic generation and optical rectification.
- Igor Ilyakov
- , Arne Brataas
- & Sergey Kovalev
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Article
| Open AccessQuantum storage of entangled photons at telecom wavelengths in a crystal
Storage of photon entanglement at telecommunication wavelength is an important milestone for the development of the quantum internet. Here, the authors demonstrate storage and retrieval of entangled telecom photons—generated through SWFM in a silicon nitride microring resonator—in an Erbium doped crystal.
- Ming-Hao Jiang
- , Wenyi Xue
- & Xiao-Song Ma
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Matters Arising
| Open AccessReassessing the existence of soft X-ray correlated plasmons
- Mohsen Moazzami Gudarzi
- & Seyed Hamed Aboutalebi
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Article
| Open AccessAll-dielectric scale invariant waveguide
The Authors present an exciting dielectric waveguide mechanism that can confine light in regions of varying sizes, unlike conventional designs. The platform offers a unique blend of properties by leveraging radiation modes while minimizing optical losses. This work holds promise for serving as the next generation of fundamental building blocks for integrated photonics applications.
- Janderson R. Rodrigues
- , Utsav D. Dave
- & Michal Lipson
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Article
| Open AccessA random optical parametric oscillator
In this work the authors develop a Random optical parametric oscillator - the parametric analogous of random lasers. This system shows improved key metrics like tuneable repetition rates, tuneable pulse duration, inter-pulse coherence as well as simpler configuration compared with standard systems.
- Pedro Tovar
- , Jean Pierre von der Weid
- & Xiaoyi Bao
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Article
| Open AccessSubwavelength terahertz imaging via virtual superlensing in the radiating near field
The authors develop a method for sub-diffraction near-field imaging using measurements taken relatively far from an object, amplifying evanescent waves that encode the highest resolution. The increased distance greatly reduces the perturbation of the fields by the imaging device itself.
- Alessandro Tuniz
- & Boris T. Kuhlmey
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Article
| Open AccessSubcycle surface electron emission driven by strong-field terahertz waveforms
THz-driven electron emission is predicted to yield a single burst, due to the single-cycle waveform. Here, the authors demonstrate the confinement of single-cycle THz-waveform-driven electron emission to one of the two half cycles and the control of the active half cycle by changing the field polarity.
- Shaoxian Li
- , Ashutosh Sharma
- & József A. Fülöp
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Article
| Open AccessVisible-to-mid-IR tunable frequency comb in nanophotonics
Here the authors provide the experimental demonstration of a widely tunable integrated frequency comb source unlocking the spectrum from the visible to the mid-infrared in a thin-film lithium niobate platform.
- Arkadev Roy
- , Luis Ledezma
- & Alireza Marandi
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Article
| Open AccessLorentz microscopy of optical fields
Electron holography and microscopy have long been used to map static electric and magnetic fields. Here, authors establish Lorentz Microscopy of Optical Fields, a new technique that uses the deflection and interference of an electron beam to obtain phase-resolved images of nanoscale optical fields.
- John H. Gaida
- , Hugo Lourenço-Martins
- & Claus Ropers
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Article
| Open AccessTerahertz radiation by quantum interference of excitons in a one-dimensional Mott insulator
THz pulses with tuneable properties are desirable for manipulating electronic states in materials. The authors report generation of THz pulses with phase, frequency, and amplitude control by tuning exciton interference in a 1D Mott insulator of transition metal complex and provide insight into exciton dynamics.
- Tatsuya Miyamoto
- , Akihiro Kondo
- & Hiroshi Okamoto
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Article
| Open AccessHigh-Q lasing via all-dielectric Bloch-surface-wave platform
Integrating coherent light sources on surface wave platforms would offer opportunities for sensing and data processing. The authors realize a microfabricated coherent light source based on the stimulated emission of a guided Bloch surface wave mode.
- Yang-Chun Lee
- , Ya-Lun Ho
- & Jean-Jacques Delaunay
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Article
| Open AccessCascaded metasurfaces for high-purity vortex generation
The authors demonstrate an efficient way to generate high-purity vortex beams by applying optical neural networks to cascaded phase-only metasurfaces. Specifically, they present record-high-quality Laguerre-Gaussian (LGp,l) optical modes with polynomial orders p = 10 and l = 200 with purity in p, l and relative conversion efficiency of 96%, 85%, and 70%, respectively.
- Feng Mei
- , Geyang Qu
- & Shumin Xiao
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Article
| Open AccessAcoustic frequency atomic spin oscillator in the quantum regime
Realising a quantum-backaction-limited oscillator in the acoustic frequency range would have applications in sensing and metrology. Here, the authors reach this goal by demonstrating destructive interference between quantum back-action noise and shot noise down to sub-kHz range in a warm atomic vapor cell.
- Jun Jia
- , Valeriy Novikov
- & Eugene S. Polzik
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Article
| Open AccessCreating tunable lateral optical forces through multipolar interplay in single nanowires
It is a significant challenge to create an interface-free lateral optical force under the illumination of a single polarized plane wave. Here, the authors provide a minimalist paradigm to address this challenge by exploiting multipolar interplay in a single elongated particle.
- Fan Nan
- , Francisco J. Rodríguez-Fortuño
- & Xiaohao Xu
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Article
| Open AccessMultiple channelling single-photon emission with scattering holography designed metasurfaces
Here the authors demonstrate on-chip single-photon source providing two emission channels with individual direction and polarization control of each channel by implementing a plasmonic holographic metasurface coupled to a Ge-vacancy nanodiamond.
- Danylo Komisar
- , Shailesh Kumar
- & Sergey I. Bozhevolnyi
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Article
| Open AccessTopologically crafted spatiotemporal vortices in acoustics
The topologically robust generation of acoustic spatiotemporal vortex pulses is reported by utilizing mirror- symmetry breaking meta-gratings, which paves the way for exploring spatiotemporal structured waves in acoustics and beyond.
- Hongliang Zhang
- , Yeyang Sun
- & Zhichao Ruan
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Article
| Open AccessVisualizing moiré ferroelectricity via plasmons and nano-photocurrent in graphene/twisted-WSe2 structures
Recent experiments have shown the formation of ferroelectric domains in twisted van der Waals bilayers. Here, the authors report near-field infrared nano-imaging and nano-photocurrent measurements to investigate ferroelectricity in minimally twisted WSe2 by visualizing the plasmonic and photo-thermoelectric response of an adjacent graphene monolayer.
- Shuai Zhang
- , Yang Liu
- & D. N. Basov
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Article
| Open AccessMagnetically-dressed CrSBr exciton-polaritons in ultrastrong coupling regime
Exciton-polaritons are hybrid light matter quasi-particles, which can occur in systems exhibiting strong light-matter coupling. Here, Wang et al study exciton-polaritons in the van der Waals antiferromagnetic material, CrSBr, coupled to a Tamm plasmon microcavity and find the exciton-polaritons are sensitive to and can be tuned by the magnetic order of CrSBr.
- Tingting Wang
- , Dingyang Zhang
- & Wenjing Liu
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Article
| Open AccessHigh-resolution single-photon imaging with physics-informed deep learning
High-resolution single-photon imaging is challenging due to complex hardware and noise disturbances. Here, the authors realise simultaneous single-photon denoising and super-resolution enhancement by physics-informed deep learning, with a physical multi-source noise model, two single-photon image datasets, and a deep transformer network.
- Liheng Bian
- , Haoze Song
- & Jun Zhang
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Article
| Open AccessKapitza-resistance-like exciton dynamics in atomically flat MoSe2-WSe2 lateral heterojunction
Here, the authors use tip-enhanced photoluminescence spectroscopy to show a discontinuity of the exciton density distribution on each side of the interface of a MoSe2/WSe2 lateral heterostructure. They introduce the concept of ‘exciton Kapitza resistance’ by analogy with the interfacial thermal resistance known as ‘Kapitza resistance’.
- Hassan Lamsaadi
- , Dorian Beret
- & Jean-Marie Poumirol
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Article
| Open AccessEngineering the temporal dynamics of all-optical switching with fast and slow materials
Here the authors demonstrate the active control of an all-optical switch harnessing the interaction of light with the constituent materials. The response speeds up by two orders of magnitude and scales accordingly with the strength of the light matter interaction.
- Soham Saha
- , Benjamin T. Diroll
- & Alexandra Boltasseva
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Article
| Open AccessProof of crystal-field-perturbation-enhanced luminescence of lanthanide-doped nanocrystals through interstitial H+ doping
Lanthanide-doped inorganic nanocrystals are promising for optical imaging and biomedical applications. Here authors show that interstitial H+ doping-induced crystal-field perturbation enhances the photoluminescence intensity of lanthanide-doped inorganic nanocrystals.
- Guowei Li
- , Shihui Jiang
- & Maochun Hong
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Article
| Open AccessAn entropy-controlled objective chip for reflective confocal microscopy with subdiffraction-limit resolution
The optimized and disordered structures of planar diffractive lenses enable sub-diffraction limit focusing but destroy wide-field imaging. Here, the authors introduce the information entropy to evaluate the disorder of PDL and achieve good balance between super-focusing and imaging.
- Jun He
- , Dong Zhao
- & Kun Huang
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Article
| Open AccessEfficiently accelerated free electrons by metallic laser accelerator
Accelerated electron beams are potentially useful for imaging and different type of light sources. Here the authors demonstrate electron acceleration using metallic laser acceleration with efficiency comparable to that of dielectric laser accelerators.
- Dingguo Zheng
- , Siyuan Huang
- & Jianqi Li
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Article
| Open AccessDissipative optomechanics in high-frequency nanomechanical resonators
Dissipative optomechanics, once limited to low frequencies, now operates in a sideband-resolved regime, reshaping optical and mechanical spectra and paving the way for the individual addressing of different mechanical modes in a single device.
- André G. Primo
- , Pedro V. Pinho
- & Thiago P. Mayer Alegre
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Article
| Open AccessMicrocavity phonoritons – a coherent optical-to-microwave interface
Photonic, electronic and lattice resonances in patterned semiconductor microcavities are tailored to demonstrate coherent bidirectional microwave-to-optical conversion via phonon-exciton-photon quasi-particles in the strong-coupling regime.
- Alexander Sergeevich Kuznetsov
- , Klaus Biermann
- & Paulo Ventura Santos
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Article
| Open AccessProbing three-dimensional mesoscopic interfacial structures in a single view using multibeam X-ray coherent surface scattering and holography imaging
The authors observe X-ray coherent scattering speckles from substrate-supported planar patterns in grazing incidence reflection geometry, which constitutes hard X-ray holograms revealing three-dimensional high-resolution structural information in a single image.
- Miaoqi Chu
- , Zhang Jiang
- & Jin Wang
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Article
| Open AccessElevated concentrations cause upright alpha-synuclein conformation at lipid interfaces
The misfolding of alpha-synuclein is associated with neurodegenerative disorders such as Parkinson’s disease. The authors report a mechanism explaining why lipid membranes catalyze the formation of harmful aggregates at elevated concentrations.
- Steven J. Roeters
- , Kris Strunge
- & Tobias Weidner
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Article
| Open AccessInterplay of valley polarized dark trion and dark exciton-polaron in monolayer WSe2
Here, the authors observe that valley-polarized dark excitons in monolayer WSe2 show a distinct doping dependence when the carriers reach a critical density. This is indicative of the onset of strongly modified Fermi sea interactions.
- Xin Cong
- , Parisa Ali Mohammadi
- & Xiao-Xiao Zhang
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Article
| Open AccessOff-axis metasurfaces for folded flat optics
The authors show how concepts from metasurface flat optics and folded optics can be combined to push the limits in miniaturization of optical systems. Such optical systems can be fabricated using low-index materials, opening up a path for large-area fabrication using nanoimprint lithography.
- Brandon Born
- , Sung-Hoon Lee
- & Mark L. Brongersma
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Article
| Open AccessA theory for colors of strongly correlated electronic systems
Strongly correlated transition metal insulators are often coloured. Understanding the underlying optical response from first-principles calculations is challenging. Now, ab initio many body Green’s function theories are shown to reproduce the colours of NiO and MnF2.
- Swagata Acharya
- , Dimitar Pashov
- & Mikhail I. Katsnelson
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Article
| Open AccessSequential order dependent dark-exciton modulation in bi-layered TMD heterostructure
Here, the authors report the emergence of dark-excitons in transition-metal-dichalcogenide heterostructures that strongly rely on the stacking sequence, i.e., momentum-dark K-Q excitons located exclusively at the top layer of the heterostructure.
- Riya Sebait
- , Roberto Rosati
- & Young Hee Lee
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Article
| Open AccessLaser nanoprinting of 3D nonlinear holograms beyond 25000 pixels-per-inch for inter-wavelength-band information processing
By using femtosecond laser writing technique, the research group in Nanjing University has fabricated 3D nano-resolution nonlinear holograms in lithium niobate crystals, which is capable of processing optical information across the wavelength gaps.
- Pengcheng Chen
- , Xiaoyi Xu
- & Yong Zhang
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Article
| Open AccessTopological magneto-optical effect from skyrmion lattice
In the magneto-optical Kerr effect, light incident on a magnetic material is reflected with a shifted polarization, the size of the shift characterized by the Kerr angle. Here, Kato et al introduce a topological magneto-optical Kerr effect, where the presence of skyrmions, a type of topological spin texture, leads to a significant enhancement of the Kerr signal.
- Yoshihiro D. Kato
- , Yoshihiro Okamura
- & Youtarou Takahashi
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Article
| Open AccessCompact all-fiber quantum-inspired LiDAR with over 100 dB noise rejection and single photon sensitivity
LiDARs exploiting quantum correlations provide enhancement in noise resilience and sensitivity, but high-power classical sources offer much higher operating distances. Here, the authors show how to exploit high power classical time-frequency correlations to keep the best of both worlds.
- Han Liu
- , Changhao Qin
- & Amr S. Helmy
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Article
| Open AccessCharged biexciton polaritons sustaining strong nonlinearity in 2D semiconductor-based nanocavities
Here, the authors perform a spectroscopic study of monolayer WS2 coupled to a silver nanocavity and show the emergence of resonances in reflectance contrast measurements, which they attribute to exciton- (X), trion- (T) and charged biexciton- (XX-) polaritons, sustaining strong nonlinearity.
- Ke Wei
- , Qirui Liu
- & Tian Jiang
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Article
| Open AccessCarrier-envelope phase on-chip scanner and control of laser beams
Measurement and control of the carrier-envelope phase (CEP) is essential for applications of few-cycle laser beams. The authors present a compact on-chip, ambient-air, CEP scanning probe and show a 3D map of spatial changes of CEP and demonstrate CEP control in the focal volume with a spatial light modulator.
- Václav Hanus
- , Beatrix Fehér
- & Péter Dombi
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Article
| Open AccessAn X-ray free-electron laser with a highly configurable undulator and integrated chicanes for tailored pulse properties
Since their initial operation, free-electron lasers are regularly upgraded in their performance and parameter control. Here the authors present the first lasing results of the soft X-ray free-electron laser beamline of the Paul Scherrer Institute, demonstrating different modes of operation and polarisation control of the tailored soft X-ray pulses.
- Eduard Prat
- , Andre Al Haddad
- & Tobias Weilbach
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