Sergey Nechayev, Jörg S. Eismann, Rasoul Alaee, Ebrahim Karimi, Robert W. Boyd, Peter Banzer,
In this paper, the authors clarify the physical significance of the two types of chirality that occur in optical beams, namely geometrical chirality (determined by the spatial distribution of the beam) and optical chirality (given by the local handedness of the electromagnetic field vectors). An experiment shows how the two types of chirality couple to each other.
Tópico(s): Molecular spectroscopy and chirality
2021 - American Physical Society | Physical review. A/Physical review, A
Eric S. A. Goerlitzer, Reza Mohammadi, Sergey Nechayev, Kirsten Volk, Marcel Rey, Peter Banzer, Matthias Karg, Nicolas Vogel,
Collective excitation of periodic arrays of metallic nanoparticles by coupling localized surface plasmon resonances to grazing diffraction orders leads to surface lattice resonances with narrow line width. These resonances may find numerous applications in optical sensing and information processing. Here, a new degree of freedom of surface lattice resonances is experimentally investigated by demonstrating handedness-dependent excitation of surface lattice resonances in arrays of chiral plasmonic ...
Tópico(s): Topological Materials and Phenomena
2020 - | Advanced Materials
Sergey Nechayev, Jörg S. Eismann, Martin Neugebauer, Paweł Woźniak, Ankan Bag, Gerd Leuchs, Peter Banzer,
Structured illumination allows for satisfying the first Kerker condition of in-phase perpendicular electric and magnetic dipole moments in any isotropic scatterer that supports electric and magnetic dipole resonances. The induced Huygens' dipole may be utilized for unidirectional coupling to waveguide modes that propagate transverse to the excitation beam. We study two configurations of a Huygens' dipole, longitudinal electric and transverse magnetic dipole moments or vice versa. We experimentally ...
Tópico(s): Photonic and Optical Devices
2019 - American Physical Society | Physical review. A/Physical review, A
René Barczyk, Sergey Nechayev, Muhammad Abdullah Butt, Gerd Leuchs, Peter Banzer,
We experimentally demonstrate the emergence of a purely azimuthally polarized vectorial vortex beam with a phase singularity upon Brewster reflection of focused circularly polarized light from a dielectric substrate. The effect originates from the polarizing properties of the Fresnel reflection coefficients described in Brewster's law. An astonishing consequence of this effect is that the reflected field's Cartesian components acquire local phase singularities at Brewster's angle. Our observations ...
Tópico(s): Near-Field Optical Microscopy
2019 - American Physical Society | Physical review. A/Physical review, A
Sergey Nechayev, René Barczyk, Uwe Mick, Peter Banzer,
We experimentally investigate the chiral optical response of an individual nanostructure consisting of three equally sized spherical nanoparticles made of different materials and arranged in 90° bent geometry. Placing the nanostructure on a substrate converts its morphology from achiral to chiral. Chirality leads to pronounced differential extinction (circular dichroism) and optical rotation (circular birefringence), which would be strictly forbidden in the absence of a substrate or heterogeneity. ...
Tópico(s): Orbital Angular Momentum in Optics
2019 - American Chemical Society | ACS Photonics
Eric S. A. Goerlitzer, Reza Mohammadi, Sergey Nechayev, Peter Banzer, Nicolas Vogel,
Abstract Chiral plasmonic nanostructures hold promise for enhanced chiral sensing and circular dichroism spectroscopy of chiral molecules. It is therefore of interest to fabricate chiral plasmonic nanostructures with tailored chiroptical properties over large areas with reasonable effort. Here, a colloidal lithography approach is used to produce macroscopic arrays of sub‐micrometer 3D chiral plasmonic crescent structures over areas >1 cm 2 . The chirality originates from symmetry breaking by the introduction ...
Tópico(s): Gold and Silver Nanoparticles Synthesis and Applications
2019 - Wiley | Advanced Optical Materials
Sergey Nechayev, Jörg S. Eismann, Gerd Leuchs, Peter Banzer,
Spin-orbit interactions in optics traditionally describe an influence of the polarization degree of freedom of light on its spatial properties. The most prominent example is the generation of a spin-dependent optical vortex upon focusing or scattering of a circularly polarized plane-wave by a nanoparticle, converting spin to orbital angular momentum of light. Here, we present a mechanism of conversion of orbital-to-spin angular momentum of light upon scattering of a linearly polarized vortex beam ...
Tópico(s): Near-Field Optical Microscopy
2019 - American Physical Society | Physical review. B./Physical review. B
Martin Neugebauer, Peter Banzer, Sergey Nechayev,
Controlling the polarization state and the propagation direction of photons is a fundamental prerequisite for many nanophotonic devices and a precursor for future on-chip communication, where the emission properties of individual emitters are particularly relevant. Here, we report on the emission of partially circularly polarized photons by a linear dipole. The underlying effect is linked to the near-field part of the angular spectrum of the dipole, and it occurs in any type of linear dipole emitter, ...
Tópico(s): Photonic and Optical Devices
2019 - American Association for the Advancement of Science | Science Advances
Martin Neugebauer, Sergey Nechayev, Martin Vorndran, Gerd Leuchs, Peter Banzer,
A spherical nanoparticle can scatter tightly focused optical beams in a spin-segmented manner, meaning that the far field of the scattered light exhibits laterally separated left- and right-handed circularly polarized components. This effect, commonly referred to as giant spin Hall effect of light, strongly depends on the position of the scatterer in the focal volume. Here, a scheme that utilizes an optical weak measurement in a cylindrical polarization basis is put forward to drastically enhance ...
Tópico(s): Plasmonic and Surface Plasmon Research
2018 - American Chemical Society | Nano Letters
Sergey Nechayev, Martin Neugebauer, Martin Vorndran, Gerd Leuchs, Peter Banzer,
We investigate points of circular polarization in the far field of elliptically polarized dipoles and establish a relation between the angular position and helicity of these $C$ points and the dipole moment. In the case of highly eccentric dipoles, the $C$ points of opposite handedness exhibit only a small angular separation and occur in the low intensity region of the emission pattern. In this regard, we introduce an optical weak measurement approach that utilizes the transverse electric (azimuthal) ...
Tópico(s): Orbital Angular Momentum in Optics
2018 - American Physical Society | Physical Review Letters
Sergey Nechayev, Carmel Rotschild,
Abstract Broadband light sources are a wide class of pumping schemes for lasers including LEDs, sunlight and flash lamps. Recently, efficient coupling of broadband light to high-quality micro-cavities has been demonstrated for on-chip applications and low-threshold solar-pumped lasers via cascade energy transfer. However, the conversion of incoherent to coherent light comes with an inherent price of reduced efficiency, which has yet to be assessed. In this paper, we derive the detailed balance limit ...
Tópico(s): Spectroscopy and Quantum Chemical Studies
2017 - Nature Portfolio | Scientific Reports
Philip D. Reusswig, Sergey Nechayev, Jennifer M. Scherer, Gyu Weon Hwang, Moungi G. Bawendi, Marc A. Baldo, Carmel Rotschild,
Abstract The optical conversion of incoherent solar radiation into a bright, coherent laser beam enables the application of nonlinear optics to solar energy conversion and storage. Here, we present an architecture for solar pumped lasers that uses a luminescent solar concentrator to decouple the conventional trade-off between solar absorption efficiency and the mode volume of the optical gain material. We report a 750-μm-thick Nd 3+ -doped YAG planar waveguide sensitized by a luminescent CdSe/CdZnS ( ...
Tópico(s): Spectroscopy and Quantum Chemical Studies
2015 - Nature Portfolio | Scientific Reports
Yuri Gorodetski, Sergey Nechayev, Vladimir Kleiner, Erez Hasman,
A wave-front phase dislocation due to the scattering of surface plasmons from a topological defect is directly measured in the near field by means of interference. The dislocation strength is shown to be equal to the incident optical spin with analogy to the magnetic flux parameter in the Aharonov-Bohm effect.
Tópico(s): Quantum and electron transport phenomena
2010 - American Physical Society | Physical Review B
Nir Shitrit, Sergey Nechayev, Vladimir Kleiner, Erez Hasman,
Observation of spin-dependent plasmonics based on the interference of topological defects in the near-field is presented. We utilize the surface plasmons' scattering dynamics from localized vortex sources to create spinoptical devices as an ensemble of isolated nanoantennas to observe a "giant" spin-dependent plasmonic vortex and a spin-dependent plasmonic focusing lens. The spin-orbit point spread function, a spiral wavefront, is introduced, where the optical spin is a degree of freedom.
Tópico(s): Photonic and Optical Devices
2012 - American Chemical Society | Nano Letters
Sergey Nechayev, Peter Banzer,
Chiral light-matter interactions are at the heart of countless phenomena and applications. Here, the authors demonstrate how electric-dipole scatterers can mimic interactions of light and chiral matter. The underlying mechanism originates from the selective response of electric-dipole scatterers to the incident electric field only, and from the lack of reflection symmetry of the whole experiment. These results address the fundamentals of duality symmetry in optics and chiral light-matter interactions, ...
Tópico(s): Random lasers and scattering media
2019 - American Physical Society | Physical review. B./Physical review. B
Desapogu Rajesh, Sergey Nechayev, Dima Cheskis, Shmuel Sternklar, Yuri Gorodetski,
We experimentally investigate the behavior of the Fano-like plasmonic resonance lineshape in a simple plasmonic system comprising a subwavelength hole or a particle illuminated by a tightly focused Gaussian beam. We observe that for a small lateral displacement of the scatterer, the k-space distribution of the plasmonic wave exhibits a strong spin-dependent azimuthal variation. We attribute this phenomenon to the sensitive light-plasmon coupling conditions arising due to the specific phase matching ...
Tópico(s): Quantum Information and Cryptography
2018 - American Institute of Physics | Applied Physics Letters
Sergey Nechayev, Paweł Woźniak, Martin Neugebauer, René Barczyk, Peter Banzer,
Abstract Chiroptical effects arising in mirror‐symmetric geometrically achiral resonant heterostructures are investigated. It is shown that coalescence of extrinsic chirality, heterogeneous morphology, and substrate‐induced break of symmetry leads to pronounced circular dichroism and circular birefringence. The physics of the involved phenomena is elucidated by studying spin‐splitting in scattering and hybridized dipolar modes of a heterodimer made of gold and silicon nanoparticles of the same shape ...
Tópico(s): Liquid Crystal Research Advancements
2018 - Wiley | Laser & Photonics Review
Jörg S. Eismann, Lisa Ackermann, Brian Kantor, Sergey Nechayev, M. Zahirul Alam, Robert Fickler, Robert W. Boyd, Peter Banzer,
Light can carry both spin and orbital angular momentum. While it is known that a nonparaxial circularly polarized beam couples the spin angular momentum to orbital angular momentum, this phenomenon does not hold upon collimation of the field. With the rising interest in epsilon-near-zero photonics, integral ingredients to this field are the beam-shaping capabilities of such a regime. In this work, it is experimentally shown that a permanent conversion of spin-to-orbital angular momentum arises naturally ...
Tópico(s): Plasmonic and Surface Plasmon Research
2022 - Optica Publishing Group | Optica
Sergey Nechayev, Jörg S. Eismann, Martin Neugebauer, Peter Banzer,
Deep subwavelength localization and displacement sensing of optical nanoantennas have emerged as extensively pursued objectives in nanometrology, where focused beams serve as high-precision optical rulers while the scattered light provides an optical readout. Here, we show that in these schemes using an optical excitation as a position gauge implies that the sensitivity to displacements of a nanoantenna depends on the spatial gradients of the excitation field. Specifically, we explore one of such ...
Tópico(s): Near-Field Optical Microscopy
2020 - American Chemical Society | ACS Photonics
Andrzej Marczuk, Wojciech Misztal, Sergey Bulatov, Vladimir Nechayev, Петр Савиных,
Forage from grain plays a special role in animal nutrition because it constitutes feed with a high content of readily available carbohydrates. Unfortunately, the equipment used to prepare forage is often manufactured without the necessary justification and confirmation of the declared sizes and indicators of the work process. This forms the basis for our theoretical and experimental studies. Research has been carried out to provide justification of the design and operating parameters of the patented ...
Tópico(s): Soil Mechanics and Vehicle Dynamics
2020 - Multidisciplinary Digital Publishing Institute | Sustainability
Sergey Nechayev, Philip D. Reusswig, Marc A. Baldo, Carmel Rotschild,
Abstract High-quality micro-lasers are key ingredients in non-linear optics, communication, sensing and low-threshold solar-pumped lasers. However, such micro-lasers exhibit negligible absorption of free-space broadband pump light. Recently, this limitation was lifted by cascade energy transfer, in which the absorption and quality factor are modulated with wavelength, enabling non-resonant pumping of high-quality micro-lasers and solar-pumped laser to operate at record low solar concentration. Here, ...
Tópico(s): Solid State Laser Technologies
2016 - Nature Portfolio | Scientific Reports
Matan Revah, Sergey Nechayev, Yuri Gorodetski,
We observe an unusual polarization state conversion in the light that passes through a cylindrical hole in a thick metal film. This phenomenon is related to the helicity locking of the guided mode due to the plasmonic transverse spin—an intrinsic angular momentum of the surface waves. We show how this effect is linked to the generation of the plasmonic vortex inside the hole and can be altered by varying the hole diameter. In addition, the total light transmission through the hole is shown to be ...
Tópico(s): Metamaterials and Metasurfaces Applications
2018 - Optica Publishing Group | Optics Letters
Sergey V. Krasnoshchekov, V. V. Nechayev, Elena V. Isayeva, N. F. Stepanov,
Tópico(s): Thermodynamic properties of mixtures
2010 - Pleiades Publishing | Moscow University Chemistry Bulletin
... Johann Most, August and Lucy Parsons, Emma Goldman, Sergey Nechayev, Luigi Galleani, and Errico Malatesta shook crowns and ...
Tópico(s): Anarchism and Radical Politics
2018 - Duke University Press | Labor Studies in Working-Class History of the Americas
Eric S. A. Goerlitzer, Reza Mohammadi, Sergey Nechayev, Kirsten Volk, Marcel Rey, Peter Banzer, Matthias Karg, Nicolas Vogel,
Optical activity of surface lattice resonances is demonstrated by Nicolas Vogel and co-workers in article number 2001330. The controlled arrangement of chiral crescent-shaped nanoantennae allows a selective response of the surface lattice resonances to the handedness of incident circularly polarized light. Modified colloidal lithtography enables the fabrication of cm2-scale substrates using a self-assembled poly(N-isopropylacrylamide)–silica core–shell system as particle masks.
Tópico(s): Liquid Crystal Research Advancements
2020 - | Advanced Materials
Sergey Nechayev, Carmel Rotschild, Philip D. Reusswig, Marc A. Baldo,
Tópico(s): Photonic and Optical Devices
2016 - Nature Portfolio | Nature
Oleksandr V. Borysov, Volodymyr V. Voloshchuk, Maksym A. Nechayev, Viacheslav Lysenko, Mykola M. Nikolaychuk, Anton Portiankin, Oleksandra V. Oliinyk, Dmitry A. Lega, Dmitriy M. Volochnyuk, Sergey V. Ryabukhin,
Tópico(s): Synthesis and Characterization of Heterocyclic Compounds
2023 - Springer Science+Business Media | Chemistry of Heterocyclic Compounds