6 papers · 1 filter
Antireflection by design in bilayer metasurfaces
Jaewon Oh, Davide Cassara, Alfonso Palmieri +5
Antireflection coatings are ubiquitous in optical systems, where they maximize transmission and suppress undesirable reflections by impedance-matching uniform interfaces. Extending…
Self-healing of the Montgomery pattern
Athena Xu, Oscar de Vries, Alfonso Palmieri +3
Self-healing -- the ability of a structured beam to reconstruct its transverse profile after partial obstruction -- has been demonstrated for diffraction-free beams, where the reco…
Silica meta-optics: When high-performance does not need a high-index
Luca Sacchi, Alfonso Palmieri, Vitthal Mishra +3
Metasurfaces -- planar arrays of subwavelength nanostructures -- are typically realized with high-index dielectrics, while low-index platforms are often dismissed for their weaker…
Observation of spatially structured Montgomery effect in free space
Murat Yessenov, Luca Sacchi, Alfonso Palmieri +3
We report the first direct observation of the spatially structured Montgomery effect, a lensless self-imaging phenomenon that generalizes the Talbot effect to aperiodic structures,…
Free-standing bilayer metasurfaces in the visible
Ahmed H. Dorrah, Joon-Suh Park, Alfonso Palmieri +1
Mult-layered meta-optics have enabled complex wavefront shaping beyond their single layer counterpart owing to the additional design variables afforded by each plane. For instance,…
Shape optimization for high efficiency metasurfaces: theory and implementation
P. Dainese, L. Marra, D. Cassara +7
Complex non-local behavior makes designing high efficiency and multifunctional metasurfaces a significant challenge. While using libraries of meta-atoms provide a simple and fast i…