title: Polarization-independent dual-band infrared perfect absorber based on a metal-dielectric-metal elliptical nanodisk array.
abstract: We have designed and fabricated a dual-band plasmonic absorber in the near-infrared by employing a three-layer structure comprised of an elliptical nanodisk array on top of thin dielectric and metallic films. finite difference time domain (FDTD) simulations indicate that absorption efficiencies greater than 99% can be achieved for both resonance frequencies at normal incidence and the tunable range of the resonant frequency was modeled up to 700 nm by varying the dimensions of the three-layer, elliptical nanodisk array. The symmetry in our two-dimensional nanodisk array eliminates any polarization dependence within the structure, and the near-perfect absorption efficiency is only slightly affected by large incidence angles up to 50 degrees. Experimental measurements demonstrate good agreement with our simulation results.
authors.affiliation: School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Bingxin
authors.initials: B
authors.lastname: Zhang
authors.forename: Yanhui
authors.initials: Y
authors.lastname: Zhao
authors.forename: Qingzhen
authors.initials: Q
authors.lastname: Hao
authors.forename: Brian
authors.initials: B
authors.lastname: Kiraly
authors.forename: Iam-Choon
authors.initials: IC
authors.lastname: Khoo
authors.forename: Shufen
authors.initials: S
authors.lastname: Chen
authors.forename: Tony Jun
authors.initials: TJ
authors.lastname: Huang
mesh_terms: D000042:Absorption; D003198:Computer Simulation; D004867:Equipment Design; D008670:Metals / Q000737:chemistry; D008855:Microscopy, Electron, Scanning / Q000379:methods; D008859:Microscopy, Polarization / Q000379:methods*; D008962:Models, Theoretical; D049329:Nanostructures; D036103:Nanotechnology / Q000379:methods; D012031:Refractometry / Q000379:methods; D015203:Reproducibility of Results; D020349:Surface Plasmon Resonance / Q000379:methods
chemical_list: D008670:Metals