S. B. Glybovski | Searcharxiv

arXiv2019

Non-scattering Metasurface-bound Cavities for Field Localization, Enhancement, and Suppression

We propose and analyse metasurface-bound invisible (non-scattering) partially open cavities where the inside field distribution can be engineered. It is demonstrated both theoretically and experimentally that the cavities exhibit unidirectional invisibility at the operating frequency with enhanced or suppressed field at different positions inside the cavity volume. Several examples of applications of the designed cavities are proposed and analyzed, in particular, cloaking sensors and obstacles, enhancement of emission, and "invisible waveguides". The non-scattering mode excited in the proposed cavity is driven by the incident wave and resembles an ideal bound state in the continuum of electromagnetic frequency spectrum. In contrast to known bound states in the continuum, the mode can stay localized in the cavity infinitely long, provided that the incident wave illuminates the cavity.

physics.app-ph↗

arXiv2018

Broadband Huygens' Metasurface Based on Hybrid Resonances

Recently, a special class of Huygens' surfaces has been proposed which are capable of manipulation of transmitted wavefronts while exhibiting high transparency over a broad range of frequencies. In this work we propose and study a new meta-atom for achieving broadband transparency of Huygens' surfaces based on two mutually shifted split-ring resonators. The resonators were carefully optimized using a new developed analytical model so that their electric and magnetic responses was balanced to achieve unidirectional scattering of the incident field. Moreover, their mutual shift canceled their inductive coupling so that both the responses were resonant at the same frequency and the meta-atom exhibited no magneto-electric coupling. The analytical prediction of broadband transparency along with the frequency-dependent phase shift of the transmitted wave within the full coverage of $360\degree$ has been verified numerically and experimentally in the microwave range. The proposed metasurface can be used for symmetric high-efficient polarization conversion and beam-splitting, and opens the way for other interesting applications.

physics.app-ph↗