Features of reflection of electromagnetic waves from nanometric perforated multilayers including epsilon-near-zero metamaterials

Abstract

Using the exact solutions of electromagnetic boundary problems, analytical modeling of reflection of electromagnetic waves from nanometric perforated multilayers has been carried out. New features of operation of the multilayers including the substrate or layers of epsilon-near-zero (ENZ) materials are established. Presence of the ENZ main layer or substrate leads to the quickly changing and extreme values of phase and module of amplitude reflection coefficients depending on the system parameters. The ENZ (or metallic for the thicker systems) substrate has a significant impact on the transformation of phase difference of the reflected waves. The detailed numerical analysis of the obtained results for the multilayers including silver or phase change materials (germanium antimony tellurium alloy, vanadium dioxide) components is performed. The considered reflection characteristics are reasonably “stable” to variation of the system parameters such as oblique incidence of the exciting radiation (for TE or TM polarization), possible presence of magnetic properties of the layers and effective electromagnetic anisotropy of the substrate material. The obtained results can be used to develop ultra-thin (with significantly subwavelength thicknesses) transformers of phase and amplitude of reflected radiation, holograms, metasurfaces and other nanophotonics applications.

Features of transmission of electromagnetic waves through composite nanoresonators including epsilon-near-zero metamaterials

“…One can note that the considered geometry of inclusions (the strips) of two materials in the main composite layer is not critical for the further analysis. For example, this layer can be originated by the strips with different (unequal) values of parameters l x,y or by the system of parallel to axis Z microholes in a homogeneous host material [13,14,29]. It is important that there are, mainly, two transmitted waves at the output of the system (in the substrate), and these waves correspond to interaction of the electromagnetic field with two different materials (Strips 1, 2) in the main layer.…”

“…In the recent papers [13,14], new possibilities to develop ultra-thin transformers of reflected waves phase differences and binary holograms on the basis of perforated multilayers including epsilon-near-zero (ENZ) MMs were revealed and investigated analytically. ENZ MMs are characterized by small values of the real and imaginary parts of permittivity, and these materials are promising for many optics applications [15][16][17][18][19][20][21].…”

“…In particular, ENZ components allowed implementation of new operation regimes of nanoresonators: all-optical dynamic control of transmittance [22], hybridization of ENZ modes in double nanocavities [23], engineering of ENZ resonances in metalinsulator-metal nanocavities [24]. According to the results [13,14], the usage of ENZ substrates for such multilayers can lead to the extreme values of amplitude reflection coefficients depending on the system parameters. The ENZ (or metallic for thicker systems) substrate has a significant impact on the transformation of phase difference of the reflected waves.…”

“…According to the modeling results, the optimization of this system properties allows decreasing the holograms thicknesses down to the values of the order of 10-20 nm as well as obtaining nanometric thickness phase transformers of reflected waves. The analysis [13,14] pointed to the link between the features of interaction of electromagnetic waves with ENZ layers (for the reflection problems) and realization of regimes of effective phase transformation of the radiation using such low-dimensional systems. These results make it possible to consider the more general problem of application of ENZ MM multilayer components for phase transformation of not only reflected but also transmitted radiation.…”

Wideband Circularly Polarized Metamaterial-based Antenna employing Metasurface Structure

“…A metamaterial based CP antenna [11] employing ENG-TL has been designed to improve the gain with lesser size of single feed. In [12], new characteristics of operation of the multilayers such as the substrate of epsilon-near-zero (ENZ) materials are introduced. The presence of the ENZ substrate leads to the quickly changing and extreme values of module and phase of amplitude reflection coefficients.…”