English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Metasurfaces are subwavelength-thick constructs, consisting of discretemeta-atoms, providing discretized levels of phase accumulation thatcollectively approximate a designed optical functionality. The meta-atomsutilizing geometric phase with polarization-converting structures producedencouraging implementations of optical components including metalenses.However, to date, a pending and fundamental problem of this approach has beenthe low device efficiency that such resulting components suffer, an unwantedside effect of large lattice constants used for preventing inter-coupling oftheir meta-atoms. Although the use of near-field coupling for tuningelectromagnetic resonances found its use in constructing efficient narrow-banddesigns, such structures fell short of providing high efficiency over a broadspectrum. Here, we propose and show that tightly packed fabric of identicaldielectric nanopillar waveguides with continuously-tuned inter-couplingdistances make excellent and complete achromatic metasurface elements. Thisarchitecture enables the scatterers to interact with the incoming waveextremely efficiently. As a proof-of-concept demonstration, we showed anachromatic cylindrical metalens, constructed from strongly coupled dielectricnanopillars of a single geometry as continuously-set phase elements in a'meta-atomless' fashion, working in the entirety of 400-700 nm band. Thismetalens achieves over 85 percent focusing efficiency across this wholespectral range. To combat polarization sensitivity, we used hexagonally stackednanopillars to build up a polarization-independent scatterer library. Finally,a circular metalens with polarization-independent operation and achromaticfocusing was obtained. This is a paradigm shift in making an achromaticmetasurface architecture by wovening identical nanopillars coupled into anirregular lattice constructed via careful tuning.

'Meta-atomless' architecture based on an irregular continuous fabric of  coupling-tuned identical nanopillars enables highly efficient and achromatic  metasurfaces