Metamaterial-based radiating and absorbing structures II
16:40 Invited talk : Broadband metamaterial absorbers from multilayered polymer-based nanocomposite films
Yann Danlee, Arnaud Delcorte, Sophie Hermans, Luc Piraux, Christian Bailly, Isabelle Huynen
UCL (Belgium) Broadband absorbers were obtained by a multilayer arrangement of polymer nanocomposites built from alternating dielectric polycarbonate films and conducting layers. The latter are stacked in a gradient of conductivity, and consist of either Nickel nanowires carpets sandwiched between polycarbonate films or Carbon Nanotubes-patterned polycarbonate films. Nickel-based absorbers demonstrate excellent performance thanks to enhanced attenuation provided by magnetic response of Nickel, while anisotropic conductive layers obtained by ink deposition of carbon nanotubes patterns onto polycarbonate films provide polarization-selective absorbers
17:00 Invited talk : Metamaterial perfect absorbers for electromagnetic wave at low frequencies
YoungPak Lee (1),Y. J. Yoo (1),B. X. Khuyen (1),Y. J. Kim (1),J. Y. Rhee (2),Y. H. Kim (3),K. W. Kim (4)
(1)Hanyang University (Korea) , (2)Sungkyunkwan University (Korea) , (3)Infovion Inc. (Korea) , (4)Sunmoon University (Korea) Using a planar and flexible metamaterial (MM), we obtained the low-frequency perfect absorption even with very small unit-cell size in snake-shape structure. The ratio between periodicity and resonance wavelength (in mm) is close to 1/12 and 1/30 at 2 GHz and 400 MHz, respectively. We also demonstrated a MM perfect absorber in MHz region based on a planar sandwiched structure of metal-dielectric-metal.
17:20 Invited talk : Broadband metasurfaces for the design of planar lenses
Oscar Quevedo-Teruel (1),Mahsa Ebrahimpouri (2),Malcolm Ng Mou Kehn (3)
(1)KTH Royal Institute of Technology (Sweden) , (2)Royal Institute of Technology (Sweden) , (3)National Chiao Tung University (Taiwan) Metasurfaces have demonstrated to be a low cost solution for development of directive antennas at high frequency. One of the opportunities of metasurfaces is the possibility to produce planar lenses. However, these lenses usually present a narrow band of operation. Those limitations on bandwidth are more restrictive when the required range of refractive index is high. Here, we present a novel implementation of metasurfaces with low dispersion that can be employed for the design of broadband planar lenses.
17:40 Invited talk : Non-coplanar refraction in microwave region by ultra-thin high efficiency metalens with phase discontinuities in orthogonal directions
Kuang Zhang, Xumin Ding, Qun Wu
Harbin Institute of Technology (China) An ultrathin flat metalens experimentally realizing three-dimensional microwave manipulation has been demonstrated to be able to approach the theoretical limit of cross-polarization conversion efficiency of the transmission. The helicity-dependent phase change is introduced to the transmission and can be engineered by assembling the spatial orientation of each Pancharatnam-Berry phase element. The proposed metalens has only one single layer as thin as 0.001lambda, which massively reduces the thickness of the microwave lens along the wave propagation direction.