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Gradient-induced long-range optical pulling force based on photonic band gap

Light(Science & Applications) 2024年第5期13卷 865-874页

作者： Wenlong Lu Alexey v.Krasavin Sheng Lan anatoly v.zayats Qiaofeng Dai Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and DevicesSchool of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou 510006China Department of Physics and London Centre for Nanotechnology King’s College LondonLondon WC2R 2LSUK

Optical pulling provides a new degree of freedom in optical *** is generally believed that long-range optical pulling forces cannot be generated by the gradient of the incident ***,we theoretically propose and numerically demonstrate the realization of a long-range optical pulling force stemming from a self-induced gradient field in the manipulated *** analogy to potential barriers in quantum tunnelling,we use a photonic band gap design in order to obtain the intensity gradients inside a manipulated object placed in a photonic crystal waveguide,thereby achieving a pulling *** the usual scattering-type optical pulling forces,the proposed gradient-field approach does not require precise elimination of the reflection from the manipulated *** particular,the Einstein-Laub formalism is applied to design this unconventional gradient *** magnitude of the force can be enhanced by a factor of up to 50 at the optical resonance of the manipulated object in the waveguide,making it insensitive to *** developed approach helps to break the limitation of scattering forces to obtain longrange optical pulling for manipulation and sorting of nanoparticles and other *** developed principle of using the band gap to obtain a pulling force may also be applied to other types of waves,such as acoustic or water waves,which are important for numerous applications.

关键词： optical waveguide scattering

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All-optical switching in silicon photonic waveguides with an epsilon-near-zero resonant cavity [Invited]

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Photonics Research 2018年第5期6卷 I0026-I0030页

作者： ANDRES D.NEIRA GREGORY A.WURTZ anatoly v.zayats Department of Physics King's College London

Strong nonlinearity of plasmonic metamaterials can be designed near their effective plasma frequency in the epsilon-near-zero(ENZ) regime. We explore the realization of an all-optical modulator based on the Au nonlinearity using an ENZ cavity formed by a few Au nanorods inside a Si photonic waveguide. The resulting modulator has robust performance with a modulation depth of about 30 dB/μm and loss less than 0.8 dB for switching energies below 600 fJ. The modulator provides a double advantage of high mode transmission and strong nonlinearity enhancement in the few-nanorod-based design.

关键词： All-optical switching silicon photonic waveguides an epsilon-near-zero resonant cavity

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Hot‑electron dynamics in plasmonic nanostructures:fundamentals,applications and overlooked aspects

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eLight 2024年第1期4卷 107-128页

作者： Jacob Khurgin Anton Yu.Bykov anatoly v.zayats Electrical and Computer Engineering Department Johns Hopkins UniversityBaltimoreMDUSA Department of Physics and London Centre for Nanotechnology King’s College LondonStrandLondon WC2R 2LSUK

Light absorption near a surface of conductive materials and nanostructures leads to the excitation of nonequilibrium,high-energy charge carriers:electrons above the Fermi level or holes below *** remaining inside a material,these so-called hot carriers result in nonlinear,Kerr-type,optical effects important for controlling light with *** can also transfer into the surroundings of the nanostructures,resulting in photocurrent,or they can interact with adjacent molecules and media,inducing photochemical *** the dynamics of hot carriers and related effects in plasmonic nanostructures is important for the development of ultrafast detectors and nonlinear optical components,broadband photocatalysis,enhanced nanoscale optoelectronic devices,nanoscale and ultrafast temperature control,and other technologies of *** this review,we will discuss the fundamentals of plasmonically-engendered hot electrons,focusing on the overlooked aspects,theoretical descriptions and experimental methods to study them,and describe prototypical processes and examples of most promising applications of hotelectron processes at the metal interfaces.

关键词： dynamics nonlinear excitation

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Generalization of the optical theorem: experimental proof for radially polarized beams

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Light(Science & Applications) 2018年第1期7卷 708-717页

作者： Alexey v.Krasavin Paulina Segovia Rostyslav Dubrovka Nicolas Olivier Gregory A.Wurtz Pavel Ginzburg anatoly v.zayats Department of Physics King’s College LondonStrandLondon WC2R 2LSUK Department of Electronic Engineering Queen Mary University of LondonLondonUK School of Electrical Engineering Tel Aviv UniversityRamat AvivTel Aviv 69978Israel ITMO University St.Petersburg 197101Russia Departamento de Optica CICESECarretera Ensenada-Tijuana 391822860 EnsenadaMexico Laboratory for Optics&Biosciences Ecole PolytechniqueCNRS UMR 7645F-91128 PalaiseauFrance Department of Physics University of North FloridaJacksonville FL 32224USA

The optical theorem,which is a consequence of the energy conservation in scattering processes,directly relates the forward scattering amplitude to the extinction cross-section of the *** derived for planar scalar waves,it neglects the complex structure of the focused beams and the vectorial nature of the electromagnetic *** the other hand,radially or azimuthally polarized fields and various vortex beams,essential in modern photonic technologies,possess a prominent vectorial field ***,we experimentally demonstrate a complete violation of the commonly used form of the optical theorem for radially polarized beams at both visible and microwave *** show that a plasmonic particle illuminated by such a beam exhibits strong extinction,while the scattering in the forward direction is *** generalized formulation of the optical theorem provides agreement with the observed *** reported effect is vital for the understanding and design of the interaction of complex vector beams carrying longitudinal field components with subwavelength objects important in imaging,communications,nanoparticle manipulation,and detection,as well as metrology.

关键词： structure. field. theorem

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Experimental demonstration of linear and spinning Janus dipoles for polarisation-and wavelength-selective near-field coupling

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Light(Science & Applications) 2019年第1期8卷 732-738页

作者： Michela F.Picardi Martin Neugebauer Jorg S.Eismann Gerd Leuchs Peter Banzer Francisco J.Rodriguez-Fortuno anatoly v.zayats Department of Physics and London Centre for Nanotechnology King’s College LondonStrandLondon WC2R LS UK.2Max Planck Institute for the Science of LightStaudtstr.2D-91058 ErlangenGermany Institute of Optics Information and PhotonicsUniversity Erlangen-NurembergStaudtstr.7/B2D-91058 ErlangenGermany

The electromagnetic field scattered by nano-objects contains a broad range of wavevectors and can be efficiently coupled to waveguided *** dominant contribution to scattering from subwavelength dielectric and plasmonic nanoparticles is determined by electric and magnetic dipolar ***,we experimentally demonstrate spectral and phase selective excitation of Janus dipoles,sources with electric and magnetic dipoles oscillating out of phase,in order to control near-field interference and directional coupling to *** show that by controlling the polarisation state of the dipolar excitations and the excitation wavelength to adjust their relative contributions,directionality and coupling strength can be fully ***,we introduce a novel spinning Janus dipole featuring cylindrical symmetry in the near and far field,which results in either omnidirectional coupling or *** the propagation of guided light waves via fast and robust near-field interference between polarisation components of a source is required in many applications in nanophotonics and quantum optics.

关键词： coupling spinning excitation

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Topological transformation and free-space transport of photonic hopfions

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Advanced Photonics 2023年第1期5卷 1-7页

作者： Yijie Shen Bingshi Yu Haijun Wu Chunyu Li Zhihan Zhu anatoly v.zayats University of Southampton Optoelectronics Research Centre and Centre for Photonic MetamaterialsSouthamptonUnited Kingdom Harbin University of Science and Technology Wang Da-Heng CenterHeilongjiang Key Laboratory of Quantum ControlHarbinChina King’s College London London Centre for NanotechnologyDepartment of PhysicsLondonUnited Kingdom

Structured light fields embody strong spatial variations of polarization,phase,and ***,characterization,and exploitation of such fields can be achieved through their topological ***-dimensional(3D)topological solitons,such as hopfions,are 3D localized continuous field configurations with nontrivial particle-like structures that exhibit a host of important topologically protected ***,we propose and demonstrate photonic counterparts of hopfions with exact characteristics of Hopf fibration,Hopf index,and Hopf mapping from real-space vector beams to homotopic hyperspheres representing polarization *** experimentally generate photonic hopfions with on-demand high-order Hopf indices and independently controlled topological textures,including Néel-,Bloch-,and antiskyrmionic *** also demonstrate a robust free-space transport of photonic hopfions,thus showing the potential of hopfions for developing optical topological informatics and communications.

关键词： topology skyrmions hopfions structured light spin-orbital interaction

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Nondiffractive three-dimensional polarization features of optical vortex beams

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Advanced Photonics Nexus 2023年第2期2卷 39-47页

作者： Andrei Afanasev Jack J.Kingsley-Smith Francisco J.Rodríguez-Fortuño anatoly v.zayats The George Washington University Department of PhysicsWashingtonDCUnited States King’s College London Department of Physics and London Centre for NanotechnologyLondonUnited Kingdom

vector optical vortices exhibit complex polarization patterns due to the interplay between spin and orbital angular *** we demonstrate,both analytically and with simulations,that certain polarization features of optical vortex beams maintain constant transverse spatial dimensions independently of beam divergence due to *** polarization features appear in the vicinity of the phase singularity and are associated with the presence of longitudinal electric *** predicted effect may prove important in metrology and high-resolution imaging applications.

关键词： optical angular momentum diffraction polarization

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Properties of Ball Lightning as a Basis for Creating Its Theory

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Journal of Applied Mathematics and Physics 2025年第1期13卷 209-229页

作者： anatoly I. Nikitin v.L. Talrose Institute for Energy Problems of Chemical Physics at N.N. Semenov Federal Research Center for Chemical Physics Russian Academy of Sciences Moscow Russia

Observational data of ball lightning often contradict each other, so it was sometimes proposed to build a theory of ball lightning based on only a small number of statistically reliable observations. Work on this principle did not bring results. The correct approach to creating the theory of ball lightning should be the desire to explain all of its properties, even those that are rare. In the database of ball lightning observations, the most valuable are the cases when it left traces available for quantitative analysis, or was filmed by video cameras. Ball lightning is a material body consisting of a shell and a multi-element core. Cases of water heating made it possible to determine energy density of ball lightning, which turned out to be higher than 1010 J/m3. A study of results of ball lightning explosion, as well as its effect on snow, made it possible to assume that it is capable of generating radiation with a wavelength of about 10 cm, the power of which can be greater than 120 kW. Ball lightning has an electric charge of 10−3 - 10−1 C. The presence of an electric charge explains the complex nature of its movement in atmosphere. Ball lightning is formed under the action of magnetic field pulse and ultraviolet radiation of linear lightning channel. A model of ball lightning in the form of a core of charged “dynamic capacitors” and a shell of polarized water molecules is considered. It is shown that this shell is capable of withstanding the force of Coulomb repulsion of the core charges and the pressure caused by the movement of charge carriers. The glow of ball lightning core occurs due to orbital motion of electrons at a speed close to light speed. The intensity of the glow is determined by the degree of uniformity of electrons arrangement along the orbit.

关键词： Ball Lightning Properties Model Core Shell Dynamic Capacitor

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Repulsion of polarised particles from anisotropic materials with a near-zero permittivity component

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Light(Science & Applications) 2016年第1期5卷 752-759页

作者： Francisco J Rodríguez-Fortuño anatoly v.zayats Department of Physics King’s College LondonStrandLondon WC2R 2LSUK

Reduction of adhesion and stiction is crucial for robust operation on nanomechanical and optofluidic devices as well as atom and molecule behaviour near *** can be achieved using electric charging,magnetic materials or light pressure and optical *** we show that a particle scattering or emitting in close proximity to an anisotropic substrate can experience a repulsive force if one of the diagonal components of the permittivity tensor is close to *** derive an analytic condition for the existence of such repulsive force depending on the optical properties of the *** also demonstrate the effect using realistic anisotropic metamaterial implementations of a *** anisotropic metamaterial approach using metal–dielectric and graphene–dielectric multilayers provides a tuneable spectral range and a very broad bandwidth of electromagnetic repulsion forces,in contrast to isotropic substrates.

关键词： anisotropy metamaterials optical force repulsion

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Four-wave mixing in a laser diode gain medium induced by the feedback from a high-Q microring resonator

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Photonics Research 2025年第1期13卷 59-68页

作者： DARIA M.SOKOL NIKITA YU DMITRIEv DMITRY A.CHERMOSHENTSEv SERGEY N.KOPTYAEv anatoly v.MASALOv vALERY E.LOBANOv IGOR A.BILENKO ARTEM E.SHITIKOv Russian Quantum Center Moscow Institute of Physics and Technology (MIPT) Skolkovo Institute of Science and Technology Lebedev Physical Institute Russian Academy of Sciences Faculty of Physics M.V.Lomonosov Moscow State University

Laser diodes are widely used and play a crucial role in myriad modern applications including nonlinear optics and ***,we explore the four-wave mixing effect in a laser diode gain medium induced by the feedback from the high-Q microring *** phenomenon can be observed at a laser frequency scan close to the microresonator eigenfrequency,prior to the transition of the laser diode from a free-running to a self-injection locking *** effect opens up the possibility for generation of remarkably low-noise,stable,and adjustable microwave *** provide a detailed numerical study of this phenomenon proven with experimental results and demonstrate the generation of the signals in the GHz *** obtained results reveal the stability of such regime and disclose the parameter ranges enabling to achieve ***,our findings uncover,to our knowledge,a novel laser diode operation regime and pave the way for the creation of new types of chip-scale,low-noise microwave sources,which are highly demanded for diverse applications,including telecommunication,metrology,and sensing.

关键词： Four wave mixing

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