Sergey S. Kruk

Sergey S. Kruk
Australian National University | ANU · Nonlinear Physics Centre

PhD

About

149
Publications
28,462
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4,164
Citations
Additional affiliations
June 2015 - present
Australian National University
Position
  • PostDoc Position
September 2011 - June 2015
Australian National University
Position
  • PhD Student

Publications

Publications (149)
Article
Full-text available
Metasurfaces, two-dimensional lattices of nanoscale resonators, offer unique opportunities for functional flat optics and allow to control transmission, reflection, and polarization of a wavefront of light. Recently, all-dielectric metasurfaces reached remarkable efficiencies, often matching or outperforming conventional optical elements. Exploitat...
Article
Full-text available
Scattering of electromagnetic waves by subwavelength objects is accompanied by the excitation of electric and magnetic Mie resonances, that may modify substantially scattering intensity and radiation patterns. Scattered fields can be decomposed into electric and magnetic multipoles, and the magnetic multipoles lead to magnetic response of structure...
Article
Full-text available
Nonlinear effects at the nanoscale are usually associated with the enhancement of electric fields in plasmonic structures. Recently emerged new platform for nanophotonics based on high-index dielectric nanoparticles utilizes optically-induced magnetic response via multipolar Mie resonances and provides novel opportunities for nanoscale nonlinear op...
Article
Full-text available
Metadevices based on dielectric nanostructured surfaces with both electric and magnetic Mie-type resonances have resulted in the best efficiency to date for functional flat optics with only one disadvantage: a narrow operational bandwidth. Here we experimentally demonstrate broadband transparent all-dielectric metasurfaces for highly efficient pola...
Article
Full-text available
Strongly anisotropic media where the principal components of the electric permittivity and/or magnetic permeability tensor have opposite signs are termed as hyperbolic media. Such media support propagating electromagnetic waves with extremely large wavevectors, and therefore they exhibit unique optical properties. However in all artificial and natu...
Article
Full-text available
Subwavelength dielectric resonators assembled into metasurfaces have become a versatile tool for miniaturizing optical components approaching the nanoscale1–3. An important class of metasurface functionalities is associated with asymmetry in both the generation and transmission of light with respect to reversals of the positions of emitters and rec...
Preprint
Generation of higher optical harmonics has recently entered the realm of subwavelength optics, and it has been achieved in gratings and metasurfaces. Here, we demonstrate the source of high-harmonic generation scaled down to a subwavelength dielectric resonator. We study fifth and seventh optical harmonics generated from an AlGaAs resonator designe...
Article
Multiphoton processes of absorption photoluminescence have enabled a wide range of applications including three-dimensional microfabrication, data storage, and biological imaging. While the applications of two-photon and three-photon absorption and luminescence have matured considerably, higher-order photoluminescence processes remain more challeng...
Preprint
Full-text available
Terahertz waves offer a profound platform for next-generation sensing, imaging, and information communications. However, all conventional terahertz components and systems suffer from a bulky design, sensitivity to imperfections, and transmission losses. Here, we propose and experimentally demonstrate on-chip integration and miniaturization of topol...
Conference Paper
We generate up to the 7 th optical harmonic from a single AlGaAs resonator. The resonator hosts engineered modes associated with bound states in the continuum. We investigate both direct and cascade mechanisms of high harmonic generation.
Conference Paper
We study multiphoton photoluminescence from several types of nonlinear resonant metaphotonic structures. We develop a general theoretical approach to describe such nonlinear effects and confirm our predictions in experiments with perovskite metasurfaces and AlGaAs nanoantennas.
Conference Paper
We design and fabricate individual subwavelength AlGaAs nanoantennas supporting Mie resonances in the mid-infrared spectral range. Near the resonant modes, we observe five-photon upconversion photoluminescence in the visible spectral range.
Conference Paper
We design and demonstrate experimentally the on-chip integration and miniaturization of topological devices for the terahertz technologies. Our devices are based on valley-Hall photonic structures employed for integrated components of on-chip THz systems.
Article
Over the last decade, photonics in the mid-infrared (mid-IR) frequency range had major advances in both generation and detection of light. However, efficient manipulation of the mid-IR light still faces many challenges. Spatially inhomogeneous control over the wavefront and polarization of mid-IR radiation is particularly difficult. Many standard t...
Preprint
Full-text available
Subwavelength dielectric resonators assembled into metasurfaces have become versatile tools to miniaturise optical components towards the nanoscale. An important class of such functionalities is associated with asymmetries in both generation and propagation of light with respect to reversals of the positions of transmitters and receivers. A promisi...
Preprint
Full-text available
Topological states of light represent counterintuitive optical modes localized at boundaries of finite-size optical structures that originate from the properties of the bulk. Being defined by bulk properties, such boundary states are insensitive to certain types of perturbations, thus naturally enhancing robustness of photonic circuitries. Conventi...
Article
Optical materials are undergoing revolutionary transformations driven by nanotechnology. Our ability to engineer structures at a scale smaller than the wavelength of light enables new properties and functionalities otherwise not available in natural bulk optical materials. A class of such components—dielectric metasurfaces—employs two-dimensional a...
Article
Sharp optical resonances in high-index dielectric nanostructures have recently attracted significant attention for their promising applications in nanophotonics. Fano resonances, as well as resonances associated with bound states in the continuum (BIC), have independently shown a great potential for applications in nanoscale lasers, sensors, and no...
Conference Paper
We design numerically, then fabricate and study experimentally optical valley-Hall resonant dielectric metasurfaces placed on a mirror for topology-empowered third-harmonic generation from subwavelength topological edge and corner states.
Conference Paper
We show topology-controlled polarization of photoluminescence from rare-earth doped nanocrystals using disorder-immune zigzag arrays of dielectric nanoparticles. Topological control is verified by comparing emission from nanocrystals deposited on trivial and nontrivial arrays of nanoparticles.
Conference Paper
We study active metasurfaces composed of arrays of split-nanodisk resonators made of InGaAs slab with embedded InGaAsP quantum wells. We demonstrate lasing from high-Q localized anapole modes with high coherence, narrow linewidth, and low threshold.
Conference Paper
We demonstrate a novel class of metadevices with asymmetric nonlinear response. We fabricate translucent metasurfaces that generate completely independent images in transmission for the opposite directions of illumination at the third-harmonic frequency.
Conference Paper
We employ azimuthally polarized laser beams to demonstrate experimentally variations of the Fano resonance profiles in the linear spectra of individual AlGaAs nanoantennas and reveal their links to optical bound states in the continuum.
Conference Paper
We design, fabricate, and demonstrate translucent metasurfaces that generate images in transmission at third-harmonic frequency. Such metasurfaces create different and completely independent images for the opposite directions of illumination.
Article
Full-text available
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 g...
Preprint
Full-text available
Topological states of light have received significant attention due to the existence of counter-intuitive nontrivial boundary effects originating from the bulk properties of optical systems. Such boundary states, having their origin in topological properties of the bulk, are protected from perturbations and defects, and they show promises for a wid...
Article
Full-text available
We study the interplay between disorder and topology for localized edge states of light in zigzag arrays of Mie-resonant dielectric nanoparticles. We characterize the topological properties of the array by the winding number that depends on both zigzag angle and spacing between nanoparticles. For equal-spacing nanoparticle arrays, the system may ha...
Article
Full-text available
Objectives Rare-earth-doped nanocrystals are emerging light sources that can produce tunable emissions in colours and lifetimes, which has been typically achieved in chemistry and material science. However, one important optical challenge – polarization of photoluminescence – remains largely out of control by chemistry methods. Control over photolu...
Preprint
Full-text available
Rare-earth doped nanocrystals are emerging light sources used for many applications in nanotechnology enabled by human ability to control their various optical properties with chemistry and material science. However, one important optical problem -- polarisation of photoluminescence -- remains largely out of control by chemistry methods. Control ov...
Preprint
The concept of optical bound states in the continuum (BICs) underpins the existence of strongly localized waves embedded into the radiation spectrum that can enhance the electromagnetic fields in subwavelength photonic structures. Early studies of optical BICs in waveguides and photonic crystals uncovered their topological properties, and the conce...
Article
Dielectric metasurfaces composed of subwavelength resonators are widely employed for manipulating electromagnetic waves over a broad frequency spectrum ranging from microwaves to optics. Here, a novel type of metasurfaces, created by a periodic lattice of elliptical holes fabricated in a thin dielectric membrane, is studied both theoretically and e...
Preprint
We study the interplay between disorder and topology for the localized edge states of light in topological zigzag arrays of resonant dielectric nanoparticles. We characterize topological properties by the winding number that depends on both zigzag angle and spacing between nanoparticles in the array. For equal-spacing arrays, the system may have tw...
Preprint
Full-text available
Nonlinear metasurfaces incorporate many of the functionalities of their linear counterparts such as wavefront shaping but simultaneously they perform nonlinear optical transformations. This dual functionality leads to a rather unintuitive physical behavior which is still widely unexplored for many photonic applications. The nonlinear processes rend...
Article
Full-text available
Nonlinear metasurfaces incorporate many of the functionalities of their linear counterparts such as wavefront shaping but simultaneously they perform nonlinear optical transformations. This dual functionality leads to a rather unintuitive physical behavior which is still widely unexplored for many photonic applications. The nonlinear processes rend...
Article
Full-text available
Halide perovskites are promising materials for optoelectronic devices, solar cells and various photonic applications due to their unique optical and electronic properties and low-cost fabrication. Halide perovskites micro and nanoscale structures have demonstrated high resonance properties last decade. Moreover, these materials allow high throughpu...
Article
Full-text available
All‐dielectric metasurfaces have become a new paradigm for flat optics as they allow flexible engineering of the electromagnetic space of propagating waves. Such metasurfaces are usually composed of individual subwavelength elements embedded into a host medium or placed on a substrate, which often diminishes the quality of the resonances. The subst...
Article
Full-text available
Enhancing optical nonlinearity Intense pulses of light interacting with a dielectric material can induce optical nonlinear behavior, whereby the frequency of the output light can be doubled or tripled or excited to even higher harmonics of the input light. Usually this interaction is weak and occurs over many thousands of wavelengths, typically req...
Conference Paper
We fabricate nanophotonic topological cavities incorporating III-V semiconductor quantum wells and observe room-temperahrre lasing with narrow spectrum, high coherence, and threshold behavior. The emitted beam hosts a singularity encoded by the specific triade cavity mode.
Conference Paper
We demonstrate nonlinear silicon metasurfaces empowered by collective localized modes governed by bound states in the continuum operating in mid-infrared spectral range. When being resonantly excited, the metasurfaces generate 3 rd to 11 th odd optical harmonics.
Conference Paper
We observe for the first time high-quality modes in subwavelength dielectric resonators. Such modes result from interference of two dissimilar leaky modes, and they are governed by the physics of bound states in the continuum.
Conference Paper
We demonstrate Mie-resonant silicon metasurfaces tunable via the insulator-to-metal transition of a deposited VO2 layer. We observe two orders of magnitude modulation depth of the metasurface reflection with reversible properties and a hysteresis-like behavior.
Conference Paper
We employ vector beams to observe the transformations of the Fano resonance lineshape in the scattering spectra of individual AlGaAs nanoparticles which support high-quality modes associated with the physics of bound states in the continuum.
Conference Paper
We introduce Mie-resonant dielectric membrane metasurfaces for THz frequencies. We design silicon membrane metasurfaces with the 2π phase coverage and high transmission efficiencies to provide novel opportunities for an efficient wavefront control and multifunctional operations.
Conference Paper
We employ cylindrical vector beams to uncover the transformation of the Fano resonance lineshape in the scattering spectra of individual subwavelength AlGaAs nanoparticles close to the regime of bound states in the continuum. © 2020 The Author(s)
Conference Paper
Through the utilization of optical bound states in the continuum supported by resonant Si metasurfaces in the mid-IR spectral range, we demonstrate the generation of odd optical harmonics, from the 3rd to the 11th order.
Conference Paper
We bring the physics of topological corner states to the nanoscale. We study experimentally topology-driven nonlinear effects generated by subwavelength edge and corner topological states in optical valley-Hall dielectric metasurfaces.
Article
We study, both theoretically and experimentally, tunable metasurfaces supporting sharp Fano-resonances inspired by optical bound states in the continuum. We explore the use of arsenic trisulfide (a photosensitive chalcogenide glass) having optical properties which can be finely tuned by light absorption at the post-fabrication stage. We select the...
Preprint
We study, both theoretically and experimentally, tunable metasurfaces supporting sharp Fano-resonances inspired by optical bound states in the continuum. We explore the use of arsenic trisulfide (a photosensitive chalcogenide glass) having optical properties which can be finely tuned by light absorption at the post-fabrication stage. We select the...
Article
Full-text available
Recent progress in nanoscale optics is driven by the physics of electric and magnetic resonances supported by high-index dielectric nanoparticles. Here, we exploit optical bound states in the continuum in a subwavelength particle enhanced by an engineered substrate undergoing an epsilon-near-zero transition from an insulator to a conductor, and unc...
Article
We study nonlinear effects in two-dimensional photonic metasurfaces supporting topologically protected helical edge states at the nanoscale. We observe strong third-harmonic generation mediated by optical nonlinearities boosted by multipolar Mie resonances of silicon nanoparticles. Variation of the pump-beam wavelength enables independent high-cont...
Preprint
Full-text available
Bound states in the continuum (BICs) represent localized modes with energies embedded in the continuous spectrum of radiating waves. BICs were discovered initially as a mathematical curiosity in quantum mechanics, and more recently were employed in photonics. Pure mathematical bound states have infinitely-large quality factors (Q factors) and zero...
Article
A subwavelength‐thick spatial‐mode multiplexer based on a highly transparent all‐dielectric Mie‐resonant metasurface is demonstrated with a broadband response covering major optical communication wavelength bands. The metasurface is employed to convert simultaneously each orthogonal polarization of LP01 inputs into individual higher‐order TM01 and...
Article
Full-text available
Topological photonics has emerged as a route to robust optical circuitry protected against disorder1,2 and now includes demonstrations such as topologically protected lasing3–5 and single-photon transport⁶. Recently, nonlinear optical topological structures have attracted special theoretical interest7–11, as they enable tuning of topological proper...