2, ITMO University, Saint Petersburg, , Russian Federation
In this talk, I will address a few aspects in metamaterial properties, related to their design, which pose a perceivably substantial theoretical and practical importance, and yet are often underestimated in our community.
One example is an exceptionally strong effect of metamaterial boundaries and shape of metamaterial samples on their observable properties. The effect owes to extraordinarily strong mutual interaction between closely positioned elements, which enhances the boundary role and results in remarkable deviations between the effective medium predictions and realistic properties if finite samples. The eventual convergence towards a homogenisable response is quite slow, which poses direct implications for any conceivable practical designs.
Another example is related to opto-acoustic metamaterial designs, which offer artificial electrostriction and enhanced stimulated Brillouin scattering (SBS). On this track, a simple and non-resonant composite medium, such as an array of spheres embedded in a matrix of a different material, attains an artificial term in the electrostriction coefficient so the resulting photoelasticity can exceed that of the individual components, potentially offering more than a threefold enhancement in the electrostriction. We have further extended these approaches to inverse opal structures, paving a way towards all-Si-based CMOS-compatible SBS.
Yet another example is the largely unexplored potential of artificial diamagnetics, where a robust and easily scalable design, based, once again, on non-resonant elements, demonstrates outstanding performance compared to traditional weak diamagnetism. The great role of mutual interaction and strong coupling in a specially tailored lattice of meta-atoms, is once again a key feature here, easily leading to a magnitude of effective permeabilities below 0.1, further armed with efficient reconfigurability, and playing a step on the way to the near-zero range.
I greatly acknowledge the contribution of R. Marques, L. Jelinek, M. J. A. Smith, C. Wolff, B. T. Kuhlmey, C. Martijn de Sterke, P. A. Belov, Y. S. Kivshar, R. C. McPhedran, and C. G. Poulton to various aspects of the reported research.