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Broadband vectorial ultrathin optics with experimental efficiency up to 99%in the visible region via universal approximators

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Light(Science & Applications) 2021年第3期10卷 420-433页

作者： F.Getman M.Makarenko A.Burguete-Lopez a.fratalocchi PRIMALIGHT Faculty of Electrical EngineeringApplied Mathematics and Computational ScienceKing Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia

Integrating conventional optics into compact nanostructured surfaces is the goal of flat *** the enormous progress in this technology,there are still critical challenges for real-world applications due to the limited operational efficiency in the visible region,on average lower than 60%,which originates from absorption losses in wavelengththick(~500 nm)*** issue is the realization of on-demand optical components for controlling vectorial light at visible frequencies simultaneously in both reflection and transmission and with a predetermined wavefront *** this work,we developed an inverse design approach that allows the realization of highly efficient(up to 99%)ultrathin(down to 50 nm thick)optics for vectorial light control with broadband input-output responses in the visible and near-IR regions with a desired wavefront *** approach leverages suitably engineered semiconductor nanostructures,which behave as a neural network that can approximate a user-defined input-output *** performance results from the ultrathin nature of these surfaces,which reduces absorption losses to nearnegligible ***,we discuss polarizing beam splitters,comparing their performance with the best results obtained from both direct and inverse design techniques,and new flat-optics components represented by dichroic mirrors and the basic unit of a flat-optics display that creates full colours by using only two subpixels,overcoming the limitations of conventional LCD/OLED technologies that require three subpixels for each composite *** devices can be manufactured with a complementary metal-oxide-semiconductor(CMOS)-compatible process,making them scalable for mass production at low cost.

关键词： optics visible inverse

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Scalable, ultra-resistant structural colors based on network metamaterials

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Light(Science & Applications) 2016年第1期5卷 165-172页

作者： Henning Galinski Gael Favraud Hao Dong Juan S Totero Gongora Grégory Favaro Max Döbeli Ralph Spolenak Andrea.fratalocchi Federico Capasso John A.Paulson School of Engineering and Applied Sciences Harvard UniversityCambridge 02138USA Laboratory for Nanometallurgy ETH ZurichVladimir-Prelog-Weg 1-5/10Zurich 8093Switzerland PRIMALIGHT King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia Anton Paar TriTec SA Peseux CH-2034Switzerland Ion Beam Physics ETH ZurichOtto-Stern-Weg 5Zurich 8093Switzerland

Structural colors have drawn wide attention for their potential as a future printing technology for various applications,ranging from biomimetic tissues to adaptive camouflage ***,an efficient approach to realize robust colors with a scalable fabrication technique is still lacking,hampering the realization of practical applications with this ***,we develop a new approach based on large-scale network metamaterials that combine dealloyed subwavelength structures at the nanoscale with lossless,ultra-thin dielectric *** using theory and experiments,we show how subwavelength dielectric coatings control a mechanism of resonant light coupling with epsilon-near-zero regions generated in the metallic network,generating the formation of saturated structural colors that cover a wide portion of the *** measurements support the efficient observation of these colors,even at angles of 70°.The network-like architecture of these nanomaterials allows for high mechanical resistance,which is quantified in a series of nano-scratch *** such remarkable properties,these metastructures represent a robust design technology for real-world,large-scale commercial applications.

关键词： nanophotonics plasmonics structural colors

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