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| Open AccessObservation of spatiotemporal optical vortices enabled by symmetry-breaking slanted nanograting
A microscale platform composed of a slanted nanograting is experimentally demonstrated to efficiently generate spatiotemporal optical vortex. This approach paves the way towards an integrated system for ultrafast pulse shaping.
- Pengcheng Huo
- , Wei Chen
- & Ting Xu
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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 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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| Open AccessProbing molecules in gas cells of subwavelength thickness with high frequency resolution
Using gas cells for spectroscopic studies opens possibility for miniaturized platforms that can be integrated with other optical components. Here the authors demonstrate molecular rovibrational spectroscopy by confining molecules in a cell of subwavelength thickness.
- Guadalupe Garcia Arellano
- , Joao Carlos de Aquino Carvalho
- & Athanasios Laliotis
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Article
| Open AccessMode-multiplexing deep-strong light-matter coupling
The authors show an original approach to achieve strong light-matter interaction harnessing the coupling between plasmonic resonators and the Landau resonances of an underlying quantum well, demonstrating remarkably high coupling strengths.
- Joshua Mornhinweg
- , Laura Katharina Diebel
- & Christoph Lange
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Article
| Open AccessThermo-optic epsilon-near-zero effects
Nonlinear epsilon-near-zero nanodevices are attractive solutions for large-scale integrated system-on-chips yet heat genearation upon operation affects their performance. Here, the authors studied the linear and nonlinear thermo-optic effects in the indium tin oxide, commonly used material for this system.
- Jiaye Wu
- , Marco Clementi
- & Camille-Sophie Brès
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Article
| Open AccessManipulating hyperbolic transient plasmons in a layered semiconductor
Here, the authors report the generation and manipulation of transient hyperbolic plasmons in black phosphorus via ultrafast photocarrier injection, demonstrating a topological transition of the non-equilibrium iso-frequency contours and the coexistence of different transient plasmonic modes.
- Rao Fu
- , Yusong Qu
- & Jianing Chen
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Article
| Open AccessHyperbolic exciton polaritons in a van der Waals magnet
Hyperbolic exciton polaritons (HEPs) are anisotropic light-matter excitations with promising applications, but their steady-state observation is challenging. Here, the authors report experimental evidence of HEPs in a van der Waals magnet, CrSBr, via cryogenic infrared near-field microscopy.
- Francesco L. Ruta
- , Shuai Zhang
- & D. N. Basov
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Article
| Open AccessAll electromagnetic scattering bodies are matrix-valued oscillators
The usual treatment of wave scattering theory relies on a formalism that does not easily allow for probing optimal spectral response. Here, the authors show how an alternative formalism, encoding fundamental principles of causality and passivity, can be used to make sense of complex scattered fields’ structures.
- Lang Zhang
- , Francesco Monticone
- & Owen D. Miller
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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 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 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 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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| 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 AccessSuperscattering emerging from the physics of bound states in the continuum
The scattering of light by small particles plays a central role in a myriad of fields. Here, the authors demonstrate a super dipole resonance that arises when two resonant modes of a small particle interfere, overcoming a widely accepted limitation to the cross section.
- Adrià Canós Valero
- , Hadi K. Shamkhi
- & Alexander S. Shalin
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| Open AccessUltrahigh-Q guided mode resonances in an All-dielectric metasurface
The authors report a simple strategy to enable ultrahigh-Q guided-mode resonances by introducing a patterned perturbation layer on top of a multilayer-waveguide system. Such high-Q resonances are experimentally demonstrated with measured Q-factors up to 2.4 × 105.
- Lujun Huang
- , Rong Jin
- & Andrey E. Miroshnichenko
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Article
| Open AccessPoint singularity array with metasurfaces
Optical singularities are typically 1D structures like vortices. This study used metasurfaces to position ten identical point singularities with tight confinement. This could miniaturize optical systems for super-resolution microscopy and dark traps.
- Soon Wei Daniel Lim
- , Joon-Suh Park
- & Federico Capasso
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Article
| Open AccessObservation of directional leaky polaritons at anisotropic crystal interfaces
A new form of directional polaritons, leaky in nature and featuring lenticular dispersion contours, is experimentally observed both in near-field and through prism excitation, unveiling opportunities stemming from the interplay of extreme anisotropic responses, light confinement and directional radiation leakage.
- Xiang Ni
- , Giulia Carini
- & Andrea Alù
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| Open Access3D-patterned inverse-designed mid-infrared metaoptics
The authors show computationally optimized, multilayer scattering structures in the mid-infrared for high efficiency imaging. Multispectral and polarization sorting devices are fabricated via two-photon lithography and characterized optically.
- Gregory Roberts
- , Conner Ballew
- & Andrei Faraon
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Article
| Open AccessDispersion-engineered metasurfaces reaching broadband 90% relative diffraction efficiency
Authors demonstrate a dispersion engineered set of eight nanostructures capable of providing 0 to 2π full-phase coverage. Their design offers a broadband and polarization-insensitive 90% relative diffraction efficiency from 450 nm to 700 nm in wavelength.
- Wei Ting Chen
- , Joon-Suh Park
- & Federico Capasso
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| Open AccessEvanescent field trapping and propulsion of Janus particles along optical nanofibers
Manipulation of Janus particles is challenging and has limited precision. Here, the authors propose manipulation of Janus particles by optical forces in the evanescent field of an optical nanofiber, and demonstrate that they exhibit strong transverse localization on the nanofiber and much faster propulsion compared to all-dielectric particles of the same size.
- Georgiy Tkachenko
- , Viet Giang Truong
- & Síle Nic Chormaic
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| Open AccessNon-Abelian effects in dissipative photonic topological lattices
In this work, the authors show that photonic topological lattices with dissipative couplings could exhibit non-Abelian dynamics and geometric phases that are in sharp contrast to those arising in typical energy-conserving systems.
- Midya Parto
- , Christian Leefmans
- & Alireza Marandi
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| Open AccessMetasurface-stabilized optical microcavities
Microcavities concentrate light in tiny volumes and are important, e.g., for semiconductor lasers and nonlinear optics. In this paper, metasurfaces are introduced to realize microcavities with arbitrary mode profiles.
- Marcus Ossiander
- , Maryna Leonidivna Meretska
- & Federico Capasso
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| Open AccessHyperbolic material enhanced scattering nanoscopy for label-free super-resolution imaging
The authors demonstrate a label-free superresolution imaging method by using a hyperbolic material as a substrate for tailored light-matter interactions. The hyperbolic material enhanced scattering, combined with dark-field detection, result in 5.5-fold resolution improvement beyond the diffraction limit.
- Yeon Ui Lee
- , Shilong Li
- & Zhaowei Liu
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Article
| Open AccessNanoscale heterogeneity of ultrafast many-body carrier dynamics in triple cation perovskites
The optoelectronic performance of lead halide perovskite in highfluence applications are hindered by heterogeneous multi-polaron interactions in the nanoscale. Here, Nishda et al. spatially resolve sub-ns relaxation dynamics on the nanometer scale by ultrafast infrared pumpprobe nanoimaging.
- Jun Nishida
- , Peter T. S. Chang
- & Markus B. Raschke
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| Open AccessNanometer-scale photon confinement in topology-optimized dielectric cavities
Here, the authors integrate measured fabrication constraints in topology optimization to design a highly optimized dielectric nanocavity. The theoretically predicted confinement of light below the diffraction limit is confirmed by near- and far-field spectroscopy.
- Marcus Albrechtsen
- , Babak Vosoughi Lahijani
- & Søren Stobbe
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Article
| Open AccessCoherent full polarization control based on bound states in the continuum
Polarization control is of paramount importance for various applications. Here, the authors enable extreme control over light polarization spanning the entire Poincaré sphere by combining coherent control of wave phenomena and the physics of bound states in the continuum.
- Ming Kang
- , Ziying Zhang
- & Andrea Alù
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| Open AccessPlanar chiral metasurfaces with maximal and tunable chiroptical response driven by bound states in the continuum
Here, the authors employ the physics of chiral bound states in the continuum and suggest planar chiral metasurfaces with simultaneous ultrahigh quality factor and near-perfect circular dichroism in both linear regime and nonlinear regime.
- Tan Shi
- , Zi-Lan Deng
- & Xiangping Li
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Article
| Open AccessSurface plasmons induce topological transition in graphene/α-MoO3 heterostructures
Hyperbolic phonon polaritons – mixed states of photons and anisotropic lattice vibrations – offer appealing properties for nanophotonic applications. Here, the authors show that the plasmon-phonon hybridization upon electronic doping in graphene/α-MoO3 heterostructures can induce topological transitions of the polariton wavefront.
- Francesco L. Ruta
- , Brian S. Y. Kim
- & D. N. Basov
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Article
| Open AccessExtremely confined gap plasmon modes: when nonlocality matters
When approaching atomic-scale confinement of the electromagnetic radiation nonlocal effects are not negligible. Here the authors approach that regime, probing extremely confined gap plasmon modes by means of scanning near-field optical microscopy, and suggesting that quantum nonlocal corrections should be taken into account.
- Sergejs Boroviks
- , Zhan-Hong Lin
- & N. Asger Mortensen
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| Open AccessAn ultrastrongly coupled single terahertz meta-atom
By combining an asymmetric immersion lens setup and a complementary resonating metasurface, the authors are able to resolve the far-field transmission of an ultrastrongly coupled, highly subwavelength split-ring single resonator at millimeter wavelengths.
- Shima Rajabali
- , Sergej Markmann
- & Giacomo Scalari
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Article
| Open AccessInverse design enables large-scale high-performance meta-optics reshaping virtual reality
The authors present a general inverse-design framework for large-area 3D meta-optics that show engineered focusing. Such meta-optics, in combination with a laser-illuminated micro-LCD, open a path towards a future virtual reality platform.
- Zhaoyi Li
- , Raphaël Pestourie
- & Federico Capasso
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Article
| Open AccessReaching the highest efficiency of spin Hall effect of light in the near-infrared using all-dielectric metasurfaces
Here, Junsuk Rho and co-workers propose and experimentally demonstrate a metasurface supporting a large and efficient spin Hall effect of light in optical wavelength. The spin Hall shifts reaching ten wavelengths with efficiencies over 70% are observed.
- Minkyung Kim
- , Dasol Lee
- & Junsuk Rho
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| Open AccessFull 2π tunable phase modulation using avoided crossing of resonances
Though active metasurfaces have been attractive for applications requiring control of optical wavefronts, realizing metasurfaces with full phase control remains a challenge. Here, the authors report a metasurface design strategy for enhanced dynamic phase modulation and tunability.
- Ju Young Kim
- , Juho Park
- & Min Seok Jang
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Article
| Open AccessPerovskite metasurfaces with large superstructural chirality
Though chiral hybrid organic-inorganic perovskites are attractive for next-generation optoelectronics, imparting strong chirality through chemical synthesis has proved challenging. Here, the authors report all-dielectric perovskite metasurfaces with giant superstructural chirality via planar nanostructuring.
- Guankui Long
- , Giorgio Adamo
- & Cesare Soci
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| Open AccessLarge evanescently-induced Brillouin scattering at the surrounding of a nanofibre
The authors observe efficient Brillouin scattering generated by an evanescent field nearby a single pass sub-wavelength waveguide. This work creates an important bridge between Brillouin scattering in waveguides, Brillouin spectroscopy and microscopy.
- Fan Yang
- , Flavien Gyger
- & Luc Thévenaz
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Article
| Open AccessNano-spectroscopy of excitons in atomically thin transition metal dichalcogenides
Excitons play an important role in the optical properties of 2D semiconductors, but their spatial characterization is usually constrained by the diffraction limit. Here, the authors report near-field optical spectroscopy of 2D transition metal dichalcogenides with 20 nm resolution, revealing their spatially dependent excitonic spectra and complex dielectric function.
- Shuai Zhang
- , Baichang Li
- & D. N. Basov
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Article
| Open AccessAsymmetric topological pumping in nonparaxial photonics
The understanding of the topological properties of light is at the base of the future optical devices development. In this work the authors aim to suggesting a different paradigm for topological transport and manipulation of nonparaxial light, paving the way toward the new developments in the field of topological photonics
- Qingqing Cheng
- , Huaiqiang Wang
- & Yiming Pan
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| Open AccessObservation of localized magnetic plasmon skyrmions
The engineering of localized fields is at the base of ultra-compact plasmonic devices. The authors demonstrate that localized plasmon skyrmions provide a unique way to build arbitrarily shaped skyrmionic textures promising high flexibility and robustness for real applications like information processing.
- Zi-Lan Deng
- , Tan Shi
- & Andrea Alù
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Article
| Open AccessLightwave-driven scanning tunnelling spectroscopy of atomically precise graphene nanoribbons
Here, the authors perform lightwave-driven terahertz scanning tunnelling microscopy and spectroscopy of graphene nanoribbons with atomic resolution in three dimensions, revealing localized wavefunctions that are inaccessible by conventional scanning tunnelling microscopy.
- S. E. Ammerman
- , V. Jelic
- & T. L. Cocker
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Article
| Open AccessStructuring total angular momentum of light along the propagation direction with polarization-controlled meta-optics
Creating complex forms of structured light typically requires bulky optics and multiple interactions with incident light. Here the authors demonstrate versatile control over light’s polarization and orbital angular momentum along the propagation direction with a single metasurface.
- Ahmed H. Dorrah
- , Noah A. Rubin
- & Federico Capasso
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Article
| Open AccessSupertoroidal light pulses as electromagnetic skyrmions propagating in free space
Topology in electromagnetic fields can lead to a range of intriguing and unexpected phenomena. Here the authors describe a family of supertoroidal light pulses that exhibit skyrmionic topological structure flying in free space.
- Yijie Shen
- , Yaonan Hou
- & Nikolay I. Zheludev
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Article
| Open AccessInvisible surfaces enabled by the coalescence of anti-reflection and wavefront controllability in ultrathin metasurfaces
Though existing metamaterial antireflection coatings have been optimized in terms of thickness and functionality, these coatings do not provide phase control in the deep subwavelength scale. Here, the authors report multi-layered metasurfaces that provide both antireflection and phase control.
- Hongchen Chu
- , Haoyang Zhang
- & Yun Lai
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Article
| Open AccessPlanar refraction and lensing of highly confined polaritons in anisotropic media
Refraction between anisotropic media is still an unexplored phenomenon. Here, the authors investigate the propagation of hyperbolic phonon polaritons traversing α-MoO3 nanoprisms, showing a bending-free refraction effect and sub-diffractional focusing with foci size as small as 1/50 of the light wavelength in free space.
- J. Duan
- , G. Álvarez-Pérez
- & P. Alonso-González
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Article
| Open AccessEngineering phase and polarization singularity sheets
Metasurfaces allow for vast possibilities of light control. Here, the authors demonstrate on-demand engineering and realization of a broad family of two-dimensional phase singularity sheets and transverse polarization singularity sheets, opening up new aspects of light-matter interaction.
- Soon Wei Daniel Lim
- , Joon-Suh Park
- & Federico Capasso
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Article
| Open AccessQuantum surface-response of metals revealed by acoustic graphene plasmons
Knowledge of the quantum response of materials is essential for designing light–matter interactions at the nanoscale. Here, the authors report a theory for understanding the impact of metallic quantum response on acoustic graphene plasmons and how such response could be inferred from measurements.
- P. A. D. Gonçalves
- , Thomas Christensen
- & N. Asger Mortensen
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Article
| Open AccessThe limits of near field immersion microwave microscopy evaluated by imaging bilayer graphene moiré patterns
Here, the authors image twisted bilayer graphene using scanning microwave imaging microscopy, revealing structures with sizes down to 1 nm. They show that is possible by using spontaneously forming nanoscale water menisci that concentrates the microwave fields in small regions.
- Douglas A. A. Ohlberg
- , Diego Tami
- & Gilberto Medeiros-Ribeiro
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Article
| Open AccessBroadband generation of perfect Poincaré beams via dielectric spin-multiplexed metasurface
Well-controlled Poincaré beams are potentially useful in optical communications applications. Here, the authors present phase-only metasurfaces that generate broadband, perfect Poincaré beams in the visible, with radius independent of the topological number.
- Mingze Liu
- , Pengcheng Huo
- & Ting Xu
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Article
| Open AccessMomentum space toroidal moment in a photonic metamaterial
The appearance of toroidal multipolar moments in electrodynamics interrogates the question for their existence in Berry curvature, which can be seen as the “magnetic field” in the momentum space. Here, the authors observe 3D vortex distributions in the Berry curvature within a photonic metamaterial.
- Biao Yang
- , Yangang Bi
- & Shuang Zhang