Advances in Metamaterials and Plasmonics
16:40 Invited talk : Dielectric and metal-dielectric metamaterials
Venu Gopal Achanta
Tata Institute of Fundamental Research (India) Metamaterials with different functionalities are interesting for light manipulation and control. We will present some of our recent results on all-dielectric and metal-dielectric metamaterials to demonstrate omni-directional reflectionless transmission over broad wavelength range, plasmon mediated linear and nonlinear optical response of plasmonic quasicrystals, giant Goos-Hanchen shift, broadband filters, single and multi-band polarizers, ultrafast control of metamaterial resonances and tunable trapped mode resonances.
17:00 : Second Harmonic Generation in Plasmonic Nanostructures: Multiresonant Nanoantennas and Eigenmodes
Jeremy Butet, Kuang-Yu Yang, Gabriel Bernasconi, Olivier Martin
Swiss Federal Institute of Technology (Switzerland) During this talk, we will present our recent advances in the study of second harmonic generation (SHG) in plasmonic nanoantennas. The mechanisms of SHG enhancement in multiresonant nanostructures will be discussed in details and the role played by the different eigenmodes in the nonlinear response of plasmonic nanostructures will be addressed pointing out the influence of the symmetry at the excitation and emission wavelengths.
17:15 : Metasurface Absorbers for Solar Thermal Applications
Chenglong Wan, N. A. Fox, M. J. Cryan
University of Bristol (United Kingdom) Solar thermal absorbers are required to absorb strongly in the visible regime but prevent thermal radiative loss at longer wavelength. This paper explores the use of amorphous carbon in order to obtain very strong solar absorption, and assesses the use of Metal-Insulator-Metal (MIM) structures with carbon as the insulator layer to obtain a broadband strong absorber across the solar spectrum but maintain very low emissivity in the thermal infra-red bands.
17:30 : Optical vortex beam shapers based on all-dielectric Huygens' metasurfaces
Katie E. Chong (1),Isabelle Staude (1),Anthony James (2),Jason Dominguez (2),Sheng Liu (2),Salvatore Campione (2),Ganapathi S. Subramania (2),Ting S. Luk (2),Manuel Decker (1),Dragomir N. Neshev (1),Igal Brener (2),Yuri S. Kivshar (1)
(1)The Australian National University (Australia) , (2)Sandia National Laboratories (USA) Based on a recent demonstration of all-dielectric Huygens' metasurfaces, we fabricate ultra-thin silicon vortex beam-shapers with 70 percent transmittance efficiency at telecom wavelengths. Our beam-shapers consist of arrays of silicon nanodisks and are capable of converting a Gaussian beam into a vortex beam independent of the polarization of the incident beam and without polarization-conversion losses. Our realized beam-shapers demonstrate the feasibility of functional meta-devices in the optical regime, opening a door to real-world low loss flat optics.
17:45 : Independently tunable polarization-insensitive dual-band metamaterial perfect absorber based on graphene at mid-infrared frequencies
Yuping Zhang (1),T. T. Li (1),H. Y. Zhang (1),John O'Hara (2),A. J. Taylor (3),H. T. Chen (3),A. K. Azad (3)
(1)Shandong University of Science and Technology (China) , (2)Oklahoma State University (USA) , (3)Los Alamos National Laboratory (USA) We design a dual-band absorber formed by combining two cross-shaped metallic resonators of different sizes in a unit cell. Simulations indicate that absorption efficiencies greater than 98 percent can be achieved for both resonant frequencies with near perfect polarization-independence at normal incidence. We employ a design scheme that allows independent tuning of individual resonance by electrostatically changing the Fermi energy of graphene layer. The absorption remains >90 percent for a wide angle of incident up to 50 degrees for both resonances.