title: Gradient Nonlinear Pancharatnam-Berry Metasurfaces.
abstract: We apply the Pancharatnam-Berry phase approach to plasmonic metasurfaces loaded by highly nonlinear multiquantum-well substrates, establishing a platform to control the nonlinear wave front at will based on giant localized nonlinear effects. We apply this approach to design flat nonlinear metasurfaces for efficient second-harmonic radiation, including beam steering, focusing, and polarization manipulation. Our findings open a new direction for nonlinear optics, in which phase matching issues are relaxed, and an unprecedented level of local wave front control is achieved over thin devices with giant nonlinear responses.
authors.affiliation: Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78701, USA.
authors.forename: Mykhailo
authors.initials: M
authors.lastname: Tymchenko
authors.affiliation: Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78701, USA.
authors.forename: J Sebastian
authors.initials: JS
authors.lastname: Gomez-Diaz
authors.affiliation: Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78701, USA.
authors.forename: Jongwon
authors.initials: J
authors.lastname: Lee
authors.affiliation: Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78701, USA.
authors.forename: Nishant
authors.initials: N
authors.lastname: Nookala
authors.affiliation: Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78701, USA.
authors.forename: Mikhail A
authors.initials: MA
authors.lastname: Belkin
authors.affiliation: Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78701, USA.
authors.forename: Andrea
authors.initials: A
authors.lastname: Alù