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Seeing is believing

Light(Science & Applications) 2022年第3期11卷 6-7页

作者： Sergey Krasikov yuri kivshar Nonlinear Physics Center Research School of PhysicsAustralian National UniversityCanberra ACT 2601Australia and School of Physics and EngineeringITMO UniversitySt.Petersburg197101Russia

Bound states in the continuum are realized in many optical systems as“dark states”,and their presence can be detected in the regime of leaky modes via resonances in far-fields.Here the authors reveal previously unseen structure of bound states in the continuum by exploring strong near-field localization in dielectric metasurfaces.

关键词： states dielectric continuum

Nonlinear chiral metaphotonics:a perspective

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Advanced Photonics 2023年第6期5卷 17-28页

作者： Kirill Koshelev Pavel Tonkaev yuri kivshar Australian National University Research School of PhysicsNonlinear Physics CenterCanberraAustralian Capital TerritoryAustralia

We review the physics and some applications of photonic structures designed for the realization of strong nonlinear chiroptical response.We pay much attention to the recent strategy of utilizing different types of optical resonances in metallic and dielectric subwavelength structures and metasurfaces,including surface plasmon resonances,Mie resonances,lattice-guided modes,and bound states in the continuum.We summarize earlier results and discuss more recent developments for achieving large circular dichroism combined with the high efficiency of nonlinear harmonic generation.

关键词： chirality metaphotonics dielectric metasurfaces plasmonic metasurfaces nonlinear optics bound states in the continuum

Intelligent metaphotonics empowered by machine learning

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Opto-Electronic Advances 2022年第3期5卷 1-24页

作者： Sergey Krasikov Aaron Tranter Andrey Bogdanov yuri kivshar Nonlinear Physics Center Research School of PhysicsThe Australian National UniversityCanberra ACT 2601Australia School of Physics and Engineering ITMO UniversitySt.Petersburg 197101Russia Centre for Quantum Computation and Communication Technology Department of Quantum ScienceResearch School of PhysicsThe Australian National UniversityCanberraACT 2601Australia

In the recent years,a dramatic boost of the research is observed at the junction of photonics,machine learning and artifi-cial intelligence.A new methodology can be applied to the description of a variety of photonic systems including optical waveguides,nanoantennas,and metasurfaces.These novel approaches underpin the fundamental principles of light-matter interaction developed for a smart design of intelligent photonic devices.Artificial intelligence and machine learn-ing penetrate rapidly into the fundamental physics of light,and they provide effective tools for the study of the field of metaphotonics driven by optically induced electric and magnetic resonances.Here we overview the evaluation of meta-photonics induced by artificial intelligence and present a summary of the concepts of machine learning with some specif-ic examples developed and demonstrated for metasystems and metasurfaces.

关键词： metaphotonics machine learning artificial intelligence

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自旋调控的有源几何超表面

Science Bulletin 2023年第17期68卷 1843-1844页

作者： yuri kivshar Nonlinear Physics Center Research School of PhysicsAustralian National UniversityCanberra ACT 2601Australia

Metasurfaces,composed of an array of subwavelength optical scatterers on a surface,have demonstrated unprecedented capabilities of manipulating the properties of incoming light(e.g.,amplitude,phase,polarization)[1-3].Among the large family of metasurfaces,geometric metasurfaces have attracted great attention due to superior phase control[4,5].

关键词： polarization phase 超表面

All-dielectric meta-optics and non-linear nanophotonics

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National Science Review 2018年第2期5卷 144-158页

作者： yuri kivshar Nonlinear Physics Center Australian National University ITMO University

Most optical metamaterials fabricated and studied to date employ metallic components resulting in significant losses, heat and overall low efficiencies. A new era of metamaterial physics is associated with all-dielectric meta-optics, which employs electric and magnetic Mie resonances of subwavelength particles with high refractive index for an optically induced magnetic response, thus underpinning a new approach to design and fabricate functional and practical metadevices. Here we review the recent developments in meta-optics and subwavelength dielectric photonics and demonstrate that the Mie resonances can play a crucial role in the realization of the unique functionalities of meta-atoms, also driving novel effects in the fields of metamaterials and nanophotonics. We discuss the recent research frontiers in all-dielectric meta-optics and uncover how Mie resonances can be employed for a flexible control of light with full phase and amplitude engineering, including unidirectional metadevices, highly transparent metasurfaces,non-linear nanophotonics and topological photonics.

关键词： nanophotonics Mie resonances meta-optics metasurfaces metamaterials

Meta-optics and bound states in the continuum

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Science Bulletin 2019年第12期64卷 836-842页

作者： Kirill Koshelev Andrey Bogdanov yuri kivshar Nonlinear Physics Centre Australian National UniversityCanberra ACT 2601Australia ITMO University St. Petersburg 197101Russia

We discuss the recent advances in meta-optics and nanophotonics associated with the physics of bound states in the continuum(BICs). Such resonant states appear due to a strong coupling between leaky modes in optical guiding structures being supported by subwavelength high-index dielectric Mieresonant nanoantennas or all-dielectric metasurfaces. First, we review briefly very recent developments in the BIC physics in application to isolated subwavelength particles. We pay a special attention to novel opportunities for nonlinear nanophotonics due to the large field enhancement inside the particle volume creating the resonant states with high-quality(high-Q) factors, the so-called quasi-BIC, that can be supported by the subwavelength particles. Second, we discuss novel applications of the BIC physics to alldielectric optical metasurfaces with broken-symmetry meta-atoms when tuning to the BIC conditions allows to enhance substantially the Q factor of the flat-optics dielectric structures. We also present the original results on nonlinear high-Q metasurfaces and predict that the frequency conversion efficiency can be boosted dramatically by smart engineering of the asymmetry parameter of dielectric metasurfaces in the vicinity of the quasi-BIC regime.

关键词： Bound states in the continuum Meta-optics Second-harmonic generation Nanoresonator Metasurfaces

Nonlinear photonics with metasurfaces

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Photonics Research 2023年第2期11卷 122-136页

作者： POLINA VABISHCHEVICH yuri kivshar Physical Measurement Laboratory National Institute of Standards and TechnologyGaithersburgMaryland 20899USA Department of Chemistry and Biochemistry University of MarylandCollege ParkMaryland 20742USA Nonlinear Physics Center Research School of PhysicsAustralian National UniversityCanberra ACT 2601Australia

Nonlinear optics is a well-established field of research that traditionally relies on the interaction of light with macroscopic nonlinear media over distances significantly greater than the wavelength of light. However, the recently emerged field of optical metasurfaces provides a novel platform for studying nonlinear phenomena in planar geometries. Nonlinear optical metasurfaces introduce new functionalities to the field of nonlinear optics extending them beyond perturbative regimes of harmonic generation and parametric frequency conversion,being driven by mode-matching, resonances, and relaxed phase-matching conditions. Here we review the very recent advances in the rapidly developing field of nonlinear metasurface photonics, emphasizing multi-frequency and cascading effects, asymmetric and chiral frequency conversion, nonperturbative nonlinear regimes, and nonlinear quantum photonics, empowered by the physics of Mie resonances and optical bound states in the continuum.

关键词： Nonlinear nonlinear optics

Dielectric Mie voids: confining light in air

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Light(Science & Applications) 2023年第2期12卷 156-167页

作者： Mario Hentsche Kirll Koshelev Florian Sterl Steffen Botho Julian Karst Lida Shamsafar Thomas Weiss yuri kivshar Harald Giessen 4th Physics Institute and Research Center SCoPE University of StuttgartPfaffenwaldring 5770569 StuttgartGermany Nonlinear Physics Centre Research School of PhysicsAustralian National UniversityCanberraACT 2601Australia institute of Physics University of Grazand NAWI GrazUniversitatsplatz 58010 GrazAustria

Manipulating light on the nanoscale has become a central challenge in metadevices,resonant surfaces,nanoscale optical sensors,and many more,and it is largely based on resonant light confinement in dispersive and lossy metals and dielectrics.Here,we experimentally implement a novel strategy for dielectric nanophotonics:Resonant subwavelength localized confinement of light in air.We demonstrate that voids created in high-index dielectric host materials support localized resonant modes with exceptional optical properties.Due to the confinement in air,the modes do not suffer from the loss and dispersion of the dielectric host medium.We experimentally realize these resonant Mie voids by focused ion beam milling into bulk silicon wafers and experimentally demonstrate resonant light confinement down to the UV spectral range at 265 nm(4.68 eV).Furthermore,we utilize the bright,intense,and naturalistic colours for nanoscale colour printing.Mie voids will thus push the operation of functional high-index metasurfaces into the blue and UV spectral range.The combination of resonant dielectric Mie voids with dielectric nanoparticles will more than double the parameter space for the future design of metasurfaces and other micro-and nanoscale optical elements.In particular,this extension will enable novel antenna and structure designs which benefit from the full access to the modal field inside the void as well as the nearly free choice of the high-index material for novel sensing and active manipulation strategies.

关键词： dielectric utilize exceptional

Room-temperature lasing from nanophotonic topological cavities

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Light(Science & Applications) 2020年第1期9卷 823-830页

作者： Daria Smirnova Aditya Tripathi Sergey Kruk Min-Soo Hwang Ha-Reem Kim Hong-Gyu Park yuri kivshar Nonlinear Physics Center Research School of PhysicsAustralian National UniversityCanberraACT 2601Australia Institute of Applied Physics Russian Academy of ScienceNizhny Novgorod 603950Russia Department of Physics Indian Institute of TechnologyDelhi 110016India Department of Physics Korea UniversitySeoul 02841Republic of Korea

The study of topological phases of light underpins a promising paradigm for engineering disorder-immune compact photonic devices with unusual properties.Combined with an optical gain,topological photonic structures provide a novel platform for micro-and nanoscale lasers,which could benefit from nontrivial band topology and spatially localized gap states.Here,we propose and demonstrate experimentally active nanophotonic topological cavities incorporating Ⅲ-Ⅴ semiconductor quantum wells as a gain medium in the structure.We observe room-temperature lasing with a narrow spectrum,high coherence,and threshold behaviour.The emitted beam hosts a singularity encoded by a triade cavity mode that resides in the bandgap of two interfaced valley-Hall periodic photonic lattices with opposite parity breaking.Our findings make a step towards topologically controlled ultrasmall light sources with nontrivial radiation characteristics.

关键词： lasing singularity narrow