Viktor Myroshnychenko

Paderborn University

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F. Javier Garcı́a de Abajo

Institució Catalana de Recerca i Estudis Avançats

Jens Förstner

Paderborn University

Henna Farheen

Paderborn University

Luis M. Liz‐Marzán

Ikerbasque

Mathieu Kociak

Université Paris-Saclay

Giorgio Adamo

Nanyang Technological University

Christian Brosseau

Université de Bretagne Occidentale

Isabel Pastoriza‐Santos

Universidade de Vigo

Nikolay I. Zheludev

University of Southampton

Kevin F. MacDonald

University of Southampton

Cooperative Institutions

Paderborn University

Centre National de la Recherche Scientifique

Universidade de Vigo

Université Paris-Sud

Laboratoire de physique des Solides

Consejo Superior de Investigaciones Científicas

Karlsruhe Institute of Technology

University of Melbourne

Institute of Photonic Sciences

Technische Universität Berlin

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Interacting plasmon and phonon polaritons in aligned nano- and microwires

Optics Express (2012)

Viktor Myroshnychenko Andrzej Stefański Alejandro Manjavacas Maria Kafesaki R.I. Merino

The availability of macroscopic, nearly periodic structures known as eutectics opens a new path for controlling light at wavelength scales determined by the geometrical parameters of these materials and the intrinsic properties of their component phases.Here, we analyze the optical waveguiding properties of eutectic mixtures of alkali halides, formed by close-packed arrangements of aligned cylindrical inclusions.The wavelengths of phonon polaritons in these constituents are conveniently situated in the infrared and are slightly larger than the diameter and separation of the inclusions, typically consisting on single-crystal wires down to submicrometer diameter.We first discuss the gap mode and the guiding properties of metallic cylindrical waveguides in the visible and near-infrared, and in particular we investigate the transition between cylinder touching and non-touching regimes.Then, we demonstrate that these properties can be extended to the mid infrared by means of phonon polaritons.Finally, we analyze the guiding properties of an actual eutectic.For typical eutectic dimensions, we conclude that crosstalk between neighboring cylindrical wires is small, thus providing a promising platform for signal propagation and image analysis in the mid infrared.

Nanophotonics

10.1364/oe.20.010879

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Citations (29)

Plasmon spectroscopy and imaging of gold nanodecahedra

Viktor Myroshnychenko Jaysen Nelayah Giorgio Adamo Nicolas Geuquet Jonathan Rodríguez‐Fernández

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Nano-optical Trapping of Rayleigh Particles and Escherichia coli Bacteria with Resonant Optical Antennas

Nano Letters (2009)

Maurizio Righini Petru Ghenuche Sudhir Cherukulappurath Viktor Myroshnychenko F. Javier Garcı́a de Abajo

Immobilizing individual living microorganisms at designated positions in space is important to study their metabolism and to initiate an in situ scrutiny of the complexity of life at the nanoscale. While optical tweezers enable the trapping of large cells at the focus of a laser beam, they face difficulties in maintaining them steady and can become invasive and produce substantial damage that prevents preserving the organisms intact for sufficient time to be studied. Here we demonstrate a novel optical trapping scheme that allows us to hold living Escherichia coli bacteria for several hours using moderate light intensities. We pattern metallic nanoantennas on a glass substrate to produce strong light intensity gradients responsible for the trapping mechanism. Several individual bacteria are trapped simultaneously with their orientation fixed by the asymmetry of the antennas. This unprecedented immobilization of bacteria opens an avenue toward observing nanoscopic processes associated with cell metabolism, as well as the response of individual live microorganisms to external stimuli, much in the same way as pluricellular organisms are studied in biology.

Tweezers

10.1021/nl803677x

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Citations (328)

Optimization of optical waveguide antennas for directive emission of light

arXiv (Cornell University) (2021)

Henna Farheen Till Leuteritz Stefan Lindén Viktor Myroshnychenko Jens Förstner

Optical travelling wave antennas offer unique opportunities to control and selectively guide light into a specific direction which renders them as excellent candidates for optical communication and sensing. These applications require state of the art engineering to reach optimized functionalities such as high directivity and radiation efficiency, low side lobe level, broadband and tunable capabilities, and compact design. In this work we report on the numerical optimization of the directivity of optical travelling wave antennas made from low-loss dielectric materials using full-wave numerical simulations in conjunction with a particle swarm optimization algorithm. The antennas are composed of a reflector and a director deposited on a glass substrate and an emitter placed in the feed gap between them serves as an internal source of excitation. In particular, we analysed antennas with rectangular- and horn-shaped directors made of either Hafnium dioxide or Silicon. The optimized antennas produce highly directional emission due to the presence of two dominant guided TE modes in the director in addition to leaky modes. These guided modes dominate the far-field emission pattern and govern the direction of the main lobe emission which predominately originates from the end facet of the director. Our work also provides a comprehensive analysis of the modes, radiation patterns, parametric influences, and bandwidths of the antennas that highlights their robust nature.

Directivity

Side lobe

Reflector (photography)

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Nonlinear dielectric properties of random paraelectric-dielectric composites

Acta Materialia (2020)

Viktor Myroshnychenko S. I. Smirnov Pious Mathews Mulavarickal Jose Christian Brosseau Jens Förstner

Percolation (cognitive psychology)

Directed percolation

10.1016/j.actamat.2020.10.051

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Citations (9)

ChemInform Abstract: Modelling the Optical Response of Gold Nanoparticles

ChemInform (2008)

Viktor Myroshnychenko Jessica Rodríguez‐Fernández Isabel Pastoriza‐Santos Alison M. Funston Carolina Novo

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

10.1002/chin.200849210

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Spectral Imaging of Individual Split-Ring Resonators

Physical Review Letters (2010)

Guillaume Boudarham Nils Feth Viktor Myroshnychenko Stefan Lindén F. Javier Garcı́a de Abajo

We report on spectral imaging within individual silver split-ring resonators (SRRs) operating in the near infrared-visible range. We classified the optical eigenmodes from the measurement of their energies and nanometer scale spatial distributions. They are plasmonic standing waves that show great similarities with that of nanoantennas. We, however, evidenced marked differences in the near-field electric field lines' spatial distribution and the energies' dispersion. We also showed that the subwavelength defect's influence on the SRRs' eigenmodes spatial distribution is small.

Split-ring resonator

Spatial dispersion

10.1103/physrevlett.105.255501

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Citations (84)

Increasing the Field-of-View Radiation Efficiency of Optical Phased Antenna Arrays

arXiv (Cornell University) (2023)

Henna Farheen Andreas Strauch J. Christoph Scheytt Viktor Myroshnychenko Jens Förstner

Silicon photonics in conjunction with complementary metal-oxide-semiconductor (CMOS) fabrication has greatly enhanced the development of integrated optical phased arrays. This facilitates a dynamic control of light in a compact form factor that enables the synthesis of arbitrary complex wavefronts in the infrared spectrum. We numerically demonstrate a large-scale two dimensional silicon-based optical phased array (OPA) composed of nanoantennas with circular gratings that are balanced in power and aligned in phase, required for producing elegant radiation patterns in the far field. For a wavelength of 1.55$\mu m$, we optmize two antennas for the OPA exhibting an upward radiation efficiency as high as 90%, with almost 6.8% of optical power concentrated in the field of view. Additionally, we believe that the proposed OPAs can be easily fabricated and would have the ability of generating complex holographic images, rendering them an attractive candidate for a wide range of applications like LiDAR sensors, optical trapping, optogenetic stimulation and augmented-reality displays.

Phased-array optics

10.48550/arxiv.2303.18107

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Citations (1)

Optimization of optical waveguide antennas for directive emission of light

Journal of the Optical Society of America B (2021)

Henna Farheen Till Leuteritz Stefan Lindén Viktor Myroshnychenko Jens Förstner

Optical traveling wave antennas offer unique opportunities to control and selectively guide light into a specific direction, which renders them excellent candidates for optical communication and sensing. These applications require state-of-the-art engineering to reach optimized functionalities such as high directivity and radiation efficiency, low sidelobe levels, broadband and tunable capabilities, and compact design. In this work, we report on the numerical optimization of the directivity of optical traveling wave antennas made from low-loss dielectric materials using full-wave numerical simulations in conjunction with the particle swarm optimization algorithm. The antennas are composed of a reflector and a director deposited on a glass substrate, and an emitter placed in the feed gap between them serves as an internal source of excitation. In particular, we analyze antennas with rectangular- and horn-shaped directors made of either hafnium dioxide or silicon. The optimized antennas produce highly directional emissions due to the presence of two dominant guided TE modes in the director in addition to leaky modes. These guided modes dominate the far-field emission pattern and govern the direction of the main lobe emission, which predominately originates from the end facet of the director. Our work also provides a comprehensive analysis of the modes, radiation patterns, parametric influences, and bandwidths of the antennas, which highlights their robust nature.

Directivity

Reflector (photography)

10.1364/josab.438514

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Citations (6)

Interaction of light and fast electrons with metallic nanoparticles

Viktor Myroshnychenko Enrique Carbó‐Argibay Jessica Rodríguez‐Fernández Isabel Pastoriza‐Santos Jorge Pérez‐Juste

The shape and size of nanoparticles can be tuned through chemical synthesis parameters, which results in a variety of morphologies. The electromagnetic response of highly anisotropic metallic nanoparticles on external stimuli (light and fast electrons) has been modelled using a full 3D boundary element method. A good agreement between numerical calculations and experimental spectra has been obtained.

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