October 26, 2016,
Chemistry/Nanotechnology, Physics, Technology/Electronics
(a) Schematic of the multimaterial projection microstereolithography system. [(b) and (e)] Computer-aided designs and fabricated samples in [(c) and (f)] three-dimensional and [(d) and (g)] two-dimensional views of the fabricated unit cell and 2 by 2 lattice, respectively.
April 18, 2016,
Physics, Technology/Electronics
Multilayer fishnet metamaterial. (a) Sketch of the structure. Thicknesses of MgF2 and Au layers are 45 and 30 nm, respectively. Thickness of Si3N4 membrane is 50 nm. Lattice period is 750 × 750 nm. Size of holes is 260 × 530 nm. (b) Experimentally measured transmission spectrum of the fishnet metamaterial. Inset shows a scanning electron microscopy image of the fabricated structure. (c) Effective refractive index of the fishnet metamaterial extracted for the normal incidence. The marked lines in b and c represent the wavelengths in the regions of elliptic dispersion (red), crossover optical topological transition (green) and hyperbolic dispersion (blue).
Physicists have discovered radical new properties in a nanomaterial which opens new possibilities for highly efficient thermophotovolta...
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July 21, 2015,
Health/Medical, Technology/Electronics
Durdu Güney stands in his lab where he and his team work on creating a ‘perfect lens’.
Credit: Michigan Tech
Imagine if we could see nanometer-sized viruses with the naked eye. That’s a real possibility with a “perfect lens.” It is a theoretical perfected optical lens made out of metamaterials, engineered to change the way the materials interact with light. MTU researchers have found a way to possibly solve one of the biggest challenges, getting light waves to pass through the lens without getting consumed. “These findings open the possibility of reviving the early dreams of making ‘magical’ metamaterials from scratch.”
Metamaterials go beyond the limits of natural materials such as glass, plastic, metal or wood...
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July 9, 2015,
Physics, Technology/Electronics
Applications: plasmonic couplers & lenses that could create 2D holograms or focus light at the nanoscale.
Wakes occur whenever something is traveling through a medium faster than the waves it creates – in the duck’s case water waves, in the plane’s case sonic booms.
While nothing travels faster than the speed of light in a vacuum, light isn’t always in a vacuum. It is possible for something to move faster than the phase velocity of light in a medium or material and generate a wake. The most famous example of this is Cherenkov radiation, wakes produced as electrical charges travel through liquids faster than the phase velocity of light, emitting a glowing blue wake. In this case Harvard researchers created similar wakes of light-like waves moving on #metallic surface = surface plasmons
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