With the contribution from the Head of the Institute of Telecommunications, the research paper “Transparent hybrid anapole metasurfaces with negligible electromagnetic coupling for phase engineering” is published in the industry-leading journal Nanophotonics.
Nanophotonics covers recent international research results, specific developments in the field, and novel applications and is published in partnership with Sciencewise. It belongs to the top journals in the field. Nanophotonics focuses on the interaction of photons with nano-structures, such as carbon nanotubes, nano metal particles, nanocrystals, semiconductor nanodots, photonic crystals, tissue, and DNA. The journal covers the latest developments for physicists, engineers, and material scientists.
What the paper is about?
The possibility to design artificial Huygens sources by overlapping electric and magnetic resonances has established a new paradigm in flat optics, bringing devices closer to efficient wavefront shaping with direct phase engineering at the level of the individual meta-atoms. However, their efficiency is fundamentally limited by the near-field coupling between the constituents of the metalattice.
This work challenges well-conceived notion and proposes an alternative concept to achieve phase control and full transmission in metasurfaces, based on the unusual properties of the non-radiating sources known as hybrid anapoles (HAs). Authors analyze theoretically an array of such sources and demonstrate that HAs are characterized by negligible coupling with their neighbors.
In addition, the authors utilize a disordered HA array to implement a controlled phase modulation to an ultrafast Gaussian pulse to illustrate the capabilities of the proposed platform.
Obtained results
In contrast to Huygens particles, the proposed sources operate as individual meta-atoms even in highly compact designs, becoming robust against strong disorder and preserving its characteristics when deposited on dielectric substrates.
The results of the study represent a departure from the currently established designs and open an avenue toward the realization of new devices for flat optics with unprecedented efficiency
The work is open access on nanophotonics, click on this DOI link to read the full paper.
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