title: Wavelength-scale light concentrator made by direct 3D laser writing of polymer metamaterials.
abstract: We report on the realization of functional infrared light concentrators based on a thick layer of air-polymer metamaterial with controlled pore size gradients. The design features an optimum gradient index profile leading to light focusing in the Fresnel zone of the structures for two selected operating wavelength domains near 5.6 and 10.4 μm. The metamaterial which consists in a thick polymer containing air holes with diameters ranging from λ/20 to λ/8 is made using a 3D lithography technique based on the two-photon polymerization of a homemade photopolymer. Infrared imaging of the structures reveals a tight focusing for both structures with a maximum local intensity increase by a factor of 2.5 for a concentrator volume of 1.5 λ3, slightly limited by the residual absorption of the selected polymer. Such porous and flat metamaterial structures offer interesting perspectives to increase infrared detector performance at the pixel level for imaging or sensing applications.
authors.affiliation: Laboratoire de Nanotechnologie et d'Instrumentation Optique, ICD, CNRS UMR 6281, Université de Technologie de Troyes, 12 Rue Marie Curie CS42060, 10004 Troyes Cedex, France.|Laboratoire de Physique Appliquée, Université Libanaise, Faculté des Sciences II, Fanar, Liban.
authors.forename: J
authors.initials: J
authors.lastname: Moughames
authors.affiliation: Laboratoire de Nanotechnologie et d'Instrumentation Optique, ICD, CNRS UMR 6281, Université de Technologie de Troyes, 12 Rue Marie Curie CS42060, 10004 Troyes Cedex, France.
authors.forename: S
authors.initials: S
authors.lastname: Jradi
authors.affiliation: Aix-Marseille Univ., CNRS, Centrale Marseille, Institut Fresnel UMR 7249, 13013 Marseille, France.
authors.forename: T M
authors.initials: TM
authors.lastname: Chan
authors.affiliation: Laboratoire de Chimie et Physique, Université de Lorraine, 1 Bd Arago, 57070 Metz Technopôle, France.
authors.forename: S
authors.initials: S
authors.lastname: Akil
authors.affiliation: Laboratoire de Chimie et Physique, Université de Lorraine, 1 Bd Arago, 57070 Metz Technopôle, France.
authors.forename: Y
authors.initials: Y
authors.lastname: Battie
authors.affiliation: Laboratoire de Chimie et Physique, Université de Lorraine, 1 Bd Arago, 57070 Metz Technopôle, France.
authors.forename: A En
authors.initials: AE
authors.lastname: Naciri
authors.affiliation: Laboratoire de Physique Appliquée, Université Libanaise, Faculté des Sciences II, Fanar, Liban.
authors.forename: Z
authors.initials: Z
authors.lastname: Herro
authors.affiliation: Aix-Marseille Univ., CNRS, Centrale Marseille, Institut Fresnel UMR 7249, 13013 Marseille, France.
authors.forename: S
authors.initials: S
authors.lastname: Guenneau
authors.affiliation: Aix-Marseille Univ., CNRS, Centrale Marseille, Institut Fresnel UMR 7249, 13013 Marseille, France.
authors.forename: S
authors.initials: S
authors.lastname: Enoch
authors.affiliation: Groupe de Spectrométrie Moléculaire et Atmosphérique GSMA, UMR CNRS 7331, Université de Reims, U.F.R. Sciences Exactes et Naturelles, Moulin de la Housse B.P. 1039, F-51687 Reims, France.
authors.forename: L
authors.initials: L
authors.lastname: Joly
authors.affiliation: Groupe de Spectrométrie Moléculaire et Atmosphérique GSMA, UMR CNRS 7331, Université de Reims, U.F.R. Sciences Exactes et Naturelles, Moulin de la Housse B.P. 1039, F-51687 Reims, France.
authors.forename: J
authors.initials: J
authors.lastname: Cousin
authors.affiliation: Laboratoire de Nanotechnologie et d'Instrumentation Optique, ICD, CNRS UMR 6281, Université de Technologie de Troyes, 12 Rue Marie Curie CS42060, 10004 Troyes Cedex, France.
authors.forename: A
authors.initials: A
authors.lastname: Bruyant