1、1KISS Metasurfaces Workshop September 23,2024Introduction to“Metasurfaces”Noah A.Rubin-University of California San DiegoKISS Metasurfaces WorkshopPasadena,CA,USA September 23-28,20242KISS Metasurfaces Workshop September 23,2024Presentation Outline1.What are metasurfaces?Broad overview.2.Historical

2、context.3.Methods of imparting phase in diffractive optics.4.Metasurface polarization optics.5.Potential applications astronomy(incl.high-contrast imaging).3KISS Metasurfaces Workshop September 23,2024What is a“metasurface”?One definition:A subwavelength-spaced array of phase-shifting elements inten

3、ded to enact some desired behavior(either in reflection or transmission),generally in free-space.These elements the“meta-atoms”can be designed at-will and fabricated with standard semiconductor fabrication techniques.N.Yu et al.,Science 334(6054),2011 =8 mAu on SiM.Khorasaninejad et al.,Science 352(

4、6290),2016=530 nmTiO2 on SiO2J.Yang et al.,Nano Lett.17 3742,2017=1100 nmSi on SiO2C.Pfeiffer and A.Grbic,Phys.Rev.Lett.110(197401),2013Cu on RO4003Microwaves4KISS Metasurfaces Workshop September 23,2024Metasurface application areasMetalensesMiniatureCamerasSpectroscopyVortex phase platesThis list i

5、s not exhaustive and this talk will be necessarily incomplete.In some ways,any topic involving free space propagation can relate to metasurfaces,making this an impossibly broad field to cover.Polarization optics/polarimetryM.Khorasaninejad et al.,Science 352(2016)M.Faraji-Dana et al.,Nat.Comm.(2018)

6、A.Arbabi et al.,Nat.Comm.(2016)R.C.Devlin et al.,Science 358(2017)(own work)5KISS Metasurfaces Workshop September 23,2024Metasurfaces the hype Metasurfaces are often billed as“2D metamaterials”,fabricated on a plane.Sometimes also called flat optics.The scientific literature and even the popular pre