title: Flat focusing mirror.
abstract: The control of spatial propagation properties of narrow light beams such as divergence, focusing or imaging are main objectives in optics and photonics. In this letter, we propose and demonstrate experimentally a flat focusing mirror, based on an especially designed dielectric structure without any optical axis. More generally, it also enables imaging any light pattern in reflection. The flat focusing mirror with a transversal invariance can largely increase the applicability of structured photonic materials for light beam propagation control in small-dimension photonic circuits.
authors.affiliation: Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Rambla Sant Nebridi 22, 08222 Terrassa, Barcelona Spain.
authors.forename: Y C
authors.initials: YC
authors.lastname: Cheng
authors.affiliation: State Research Institute for Physical Sciences and Technology, Savanorių pr. 231, 02300 Vilnius, Lithuania.
authors.forename: S
authors.initials: S
authors.lastname: Kicas
authors.affiliation: Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Rambla Sant Nebridi 22, 08222 Terrassa, Barcelona Spain.
authors.forename: J
authors.initials: J
authors.lastname: Trull
authors.affiliation: 1] State Research Institute for Physical Sciences and Technology, Savanorių pr. 231, 02300 Vilnius, Lithuania [2] Laser Research Center, Department of Quantum Electronics, Vilnius University, Saulėtekio Ave. 10, LT-10222 Vilnius, Lithuania.
authors.forename: M
authors.initials: M
authors.lastname: Peckus
authors.affiliation: Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Rambla Sant Nebridi 22, 08222 Terrassa, Barcelona Spain.
authors.forename: C
authors.initials: C
authors.lastname: Cojocaru
authors.affiliation: Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Rambla Sant Nebridi 22, 08222 Terrassa, Barcelona Spain.
authors.forename: R
authors.initials: R
authors.lastname: Vilaseca
authors.affiliation: State Research Institute for Physical Sciences and Technology, Savanorių pr. 231, 02300 Vilnius, Lithuania.
authors.forename: R
authors.initials: R
authors.lastname: Drazdys
authors.affiliation: 1] Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Rambla Sant Nebridi 22, 08222 Terrassa, Barcelona Spain [2] Institució Catalana de Recerca i Estudis Avançats (ICREA), Pg. Lluis Companys, 23, 08010, Barcelona, Spain.
authors.forename: K
authors.initials: K
authors.lastname: Staliunas