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Optical tweezers performance is investigated when the Gaussian beam is focused on the metal substrate with nanoparticle. When the beam is focused above the substrate optical force increases about an order of magnitude due to evanescent field of surface plasmon. Novel effect of repulsion from Gaussian beam (“anti-trapping”) is obtained when the beam waist is moved below the substrate which is confirmed...
We experimentally and theoretically analyze the role of substrate on the optical bound states in the continuum (BICs). We reveal that a high-index substrate could destroy even in-plane symmetry protected BIC due to leakage into the diffraction channels opening in the substrate. We show how two concurrent loss mechanisms scattering due to surface roughness and leakage into substrate contribute to the...
Silicon carbide field emission arrays coated with two different type of nanocrystalline diamond thin film: undoped and highly boron-doped are compared. The last one shows two times lower electric field threshold for electron emission.
In this work we investigate lateral optical binding of two dielectric nanoparticles placed above a metallic substrate. We consider both longitudinal and lateral components of the optical binding force. Dyadic Green's function was used to describe analytically field distribution in the near and far field zone. Equilibrium positions for dielectric particles were calculated and contribution of metallic...
Hyperbolic metamaterials provide a platform for a new type of optical manipulation using highly confined extraordinary modes. Here we predict and analyze optical attracting forces acting on a small particle inside a hyperbolic slab.
We study both theoretically and experimentally a new class of surface electromagnetic waves supported by resonant anisotropic metasurface. At certain frequency this type of metasurface demonstrates the topological transition from elliptical to hyperbolic regime.
Optical forces, acting on spherical nanoparticle embedded inside the hyperbolic metamaterial consisting of gold nanowires, are investigated both numerically and using a semi-analytical approach beyond the effective medium approximation.
We reveal remarkable substrate-driven transformations of electric and magnetic dipole resonances of a silicon nanoparticle on metal, manifesting as the modification of Q-factor of the resonances followed by strong enhancement of the respective fields.
We show that surface plasmon polaritons (SPP) localized at anisotropic conductive interfaces possess a number of unique features. The interface is described as a two-dimensional current distribution of zero thickness by using a conductivity tensor. The dispersion of such SPP consists of two branches of hybrid TE-TM polarized modes. We reveal that, in contrast to bulk plane waves and conventional surface...
We analyse and compare the effects of the spatial dispersion and structural anisotropy on the spectrum of a metamaterial slab. Dielectric function of the slab we describe within Drude-Lorentz approximation. Anisotropy is of the slab is introduced through the anisotropy of plasma frequencies corresponding to the different component of the permittivity tensor. Spatial dispersion is considered within...
Optical tweezers are widely employed tools enabling progress in a wide range of disciplines including biophysics and many others. A standard layout of optical tweezers relies on employment of tightly focused Gaussian beams. One more widely studied class of optical trapping devices is plasmonic tweezers. A two-in-one trapping system when a beam is focused on a metal substrate is considered here. We...
In this work, we implement CMOS-compatible one-dimensional photonic structure based on silicon-on-insulator wafer supporting optical bound states in the continuum at telecommunication wavelengths — localized optical state with energy lying above the light line of the surrounding space. Such high-Q states are very promising for many potential applications ranging from on-chip photonics and optical...
We analyze spectrum of waveguide modes of an arbitrary uniaxial anisotropic metamaterial slab with non-local electromagnetic response whose permittivity tensor could be described within Drude approximation. Spatial dispersion was introduced within the hydrodynamical model. Both anisotropy and spatial dispersion were considered as perturbations. Spatial dispersion is shown to result in suppression...
Spin angular momentum is a fundamental property of the propagating optical waves. In this work, we reveal a possibility of the continuous transition from the transverse spin angular momentum as for the conventional surface plasmon-polariton to the longitudinal spin angular momentum as for the left and right circularly polarized bulk electromagnetic modes.
The article describes computational methods for determination of cetane index of diesel fuels; the most accurate method is established. On the basis of the experimental data, equations for calculation of the low-temperature properties of diesel fuels were developed. These equations allow to calculate pour point and cold filter plugging point of diesel fuels with an error not exceeding 1 °C.
The growing need in creating of anthropomorphic robots capable of operating beyond the industrial production is determined by a number of factors. Foremost, social need of systems, which allow performing actions in cooperation with a human or instead of him, in the infrastructure initially un-adapted to the robot. Interaction with external objects is possible by creating considerable force on their...
We propose new type of temaperature tunable metamaterial based on semiconductor superlattice for THz applications. We have shown that temperature activation of donors in semiconductor metamaterial results in drastic changes of the dielectric function in terahertz region. We have analyzed that the shape and topology of equal frequency contours depending on the external temperature. It was shown that...
The classical problem of the gas discharge physics is discussed: what is the sign of charge density in the negative glow region of a glow discharge. The question about the sign of the net charge in NG is important to improve and refine the classical picture of the plasma parameters distribution for a wide class of glow discharges (from the usual glow discharges, to the widely used in scientific researches...
We reveal the existence of a new types of surface electromagnetic waves supported by hyperbolic metasurface, described by a local diagonal anisotropic conductivity tensor. We present a comprehensive analysis of the dispersion and the equal frequency contours of surface waves propagating along hyperbolic metasurface. We demonstrate that the spectrum of the hyperbolic metasurface waves consists of two...
In this paper we discuss the optical forces acting on a small nanoparticle in the vicinity of a plane metallic surface. We show that illuminating the nanoparticle by a plane wave leads to the excitation of a surface plasmon polariton wave at the metallic interface, which governs the opto-mechanical response of nanoparticle. The presented calculations show that for a nanoparticle in the Rayleigh approximation...
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