Materials Literature
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Quasi-Periodic (QP) particle chains exhibit unique properties not observed in periodic ones. Furthermore, they inherently support significant long-range interactions and radiation to the surrounding medium. Hence they are fundamentally different from traditional QP structures governed by the Harper's model or the almo…
We propose an intracavity plasmon absorption spectroscopy method based on graphene active plasmonics. Maximum sensitivity is reached in the vicinity of the plasmon generation threshold. The giant amplification of sensitivity in the graphene plasmon generator is associated with a huge path length, limited only by the d…
Artificial diamagnetic metamaterials are known to produce impressively low permeability values in a broad frequency range. As an observable feature however, the same is true for good conductors. We analyse performance of artificial diamagnetics with regards to applications such as levitation, in comparison to bulk met…
A particle scattering in close proximity to an anisotropic substrate can experience a repulsive force if one of the diagonal components of the permittivity tensor is close to zero. We derive a condition for this repulsive force and show its broad bandwidth for realistic metamaterial substrates, including those based o…
An extraordinary transmission through a metamaterial-loaded subwavelength aperture is inherently a narrowband phenomenon. Here, we propose a simple experimental setup for investigation of non-Foster-based tunneling in radiofrequency regime. Combined full-wave and circuit-theory simulations showed that it is possible t…
In this paper, we investigate the conceptual realization of a concentric bi-layer composite made of the same isotropic and homogeneous semiconductor material with various porosities and show the possibility of simultaneous cloaking performance for both heat flux and electric current without disturbing external fields.
Transformation optics can involve multiple transformation operations, creating confusion as to the meaning and character of these different transformations. We use an example of cloaking in curved spacetime to elucidate the difference between cloak, coordinate, and frame transformations.
We study plasmonic properties of metal nanoparticles with sharp corner- and tip-shaped surface perturbations supporting plasmon resonances superlocalized on the scale of the curvature radius. We reveal the conditions for employing such particles as nano-antennas that precisely couple the free-space light to the nanosi…
It is shown that at focusing with flat lens of the field created by the slit with the size larger than the wavelength, the intensity distribution has two maxima and the focal distance increases. The proposed scheme combines flat lensing and generation of incomplete Airy beams.
We theoretically study the properties of the longitudinal magnetophotonic intensity effect in plasmonic structures with the magnetic dielectric possessing absorption. The effect is the magnetization-induced resonant change in transmittance. It is shown that there exists an optimal value of the absorption coefficient a…
We studied two optical modes of the gyrotropic slot waveguide consisted of a magnetic dielectric sandwiched between to different metal walls. Different types of modes are identified including backward anti-symmetric plasmonic mode that has opposite direction of the phase and group velocities. Effect of the magneto-opt…
Distribution of electric fields normal to the antenna plane in the depth direction was experimentally investigated by using mid-infrared circular antennas that were formed on Al2O3/SiO2/Si and SiO2/Al2O3/Si. The Al2O3layer was deposited using an atomic layer deposition technique which allowed for layer thickness contr…
Two new types of metamaterial based satellite navigation terminal antennas are proposed in this paper. One is multi-frequency RHCP microstrip antenna, the other is a half-mode cavity backed SIW RHCP antenna. The RIS and CSRR are used to improve antenna performance and diminish antenna size.
A recent break-through in the domain of photonic integration is the use of sub-wavelength waveguide grating structures to engineer the refractive index of integrated components. These structures are an example of a case where a nanoscale simulation over the full device is not reliable and reliance must be placed on a…
We present computationally intensive electromagnetic analysis of metamaterials involving deformed nanowires. Random deformations are introduced to modify perfect nanowires in order to investigate the effect of geometric deviations on scattering properties of optical meta-materials. Numerical simulations of realistic s…
A broad class of metasurfaces comprised of periodic arrays of interwoven multifilar spiral shaped strips and slots in conducting screens has been developed. The proposed array topologies with truly sub-wavelength unit cells enable efficient control of the unit cell reactance while maintaining excellent angular and pol…
Thick-shell or “giant” core/shell nanocrystal quantum dots (gQDs) are efficient and stable emitters. Their characteristic properties of non-blinking and non-photobleaching emission, as well as suppressed non-radiative Auger recombination and minimal self-reabsorption (due to a large effective Stokes shift) make them r…
Multi-band or broadband power absorption has been obtained from multiple arrangements of split cut wires (SCWs) of different length on grounded dielectric substrate. Computational tools were used to model the interaction between electromagnetic waves and materials with the SCWs structure. The multi-resonance of SCWs i…
We show that using uniaxial double negative metamaterials it is possible to create bodies which optimally absorb power from all spatial harmonics of the incident fields, both propagating and evanescent. Comparing with the ideal black bodies which fully absorb only all propagating waves, these new objects appear “infin…
In this contribution, we present our latest results concerning the design of microwave mantle cloaking devices and show some of their applications in different operative scenarios. We start by describing the analytical models of the anisotropic metasurfaces needed to achieve a scattering cross section (SCS) reduction…