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In this paper, we present a free-standing optical zero-index metamaterial (ZIM) with a symmetric structure in the direction of wave propagation. The metamaterial consists of a gold-polyimide-gold tri-layer stack perforated by air holes to form a fishnet geometry. With the aid of a genetic algorithm (GA), this structure is optimized to exhibit a near-zero refractive index with low absorption loss and...
In this paper, we present the first ever experimental demonstration of a conformal optical metamaterial absorber. This metamaterial absorber, composed of a doubly periodic array of stub-loaded H-shaped nanopatches optimized by a genetic algorithm, has two polarization-insensitive and angularly-independent absorption bands at 3.3µm and 3.9µm with absorption larger than 90% up to an angle of incidence...
A flexible polarization-insensitive metamaterial absorber design with a wide field of view was proposed for mid-infrared applications. Both single-band and dual-band designs based on bilayer metallo-dielectric stacks were presented. According to the simulated results, the proposed metamaterial absorbers optimized using a GA (genetic algorithm) could provide absorptivity greater than 0.94 at the target...
Gold nanoparticle based periodic arrays combined with polymer thin films have been fabricated. Near infrared transmission measurements of the effect of polymer coatings on the plasmon resonance peaks show high sensitivities to refractive index changes.
A pH-sensitive hydrogel of thickness ca. 150 nm was coated on gold nanoparticle based plasmonic crystals fabricated on glass substrates to produce a chemiresponsive sensor that shifts the resonance peak around 20 nm in the near-infrared spectrum.
Plasmonic crystal structures based on periodic arrays of gold nanorings were fabricated on glass substrates and studied by transmission measurements and by finite difference time domain simulations. Transmission measurement results, which closely match the simulation results, show two surface plasmon resonance peaks in the near infrared spectrum range and the peaks can be tuned by changing the lattice...
In this paper, metallic photonic crystals (PC) based on 2-D periodic arrays of gold nanoparticles were investigated on indium tin oxide slab waveguides using 3-D finite-difference time domain simulations with nonuniform mesh techniques. The PC effects were studied by changing the lattice constants from 300 to 500 nm. The results obtained indicate that the waveguide-excited plasmon absorption peak...
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