71 research outputs found
Broadband Absorbers and Selective Emitters based on Plasmonic Brewster Metasurfaces
We discuss the possibility of realizing utlrabroadband omnidirectional
absorbers and angularly selective coherent thermal emitters based on properly
patterned plasmonic metastructures. Instead of relying on resonant
concentration effects that inherently limit the bandwidth, we base our design
on the combination of two inherently nonresonant effects: plasmonic Brewster
funneling and adiabatic plasmonic focusing. With this approach, we demonstrate
compact, broadband absorption and emission spanning terahertz, infrared and
optical frequencies, ideal for various energy and defense applications.Comment: 20 pages, 7 figure
Non-paraxial beam propagation in nonlinear optical waveguides using complex Jacobi iteration
Abstract-We present the recently introduced beam propagation method using complex Jacobi iteration adapted for efficient modeling of non-paraxial beam propagation in nonlinear optical waveguides
Broadband Brewster transmission through 2D metallic gratings
Recently, we have introduced a mechanism to achieve ultrabroadband light funnelling and total transmission through 1D narrow metallic gratings at a specific incidence angle, the so-called plasmonic Brewster angle. This phenomenon is based on impedance matching between the guided modes supported by ultranarrow linear slits and transverse-magnetic waves at oblique incidence. In this paper, we demonstrate that such phenomenon, representing the equivalent of Brewster transmission for plasmonic screens, can also occur in 2D metallic gratings of various structural forms and shapes, and that it may be made insensitive to the azimuthal, or polarization, angle u. This finding may have relevant implications to realize large funneling, absorption and squeezing of light in perforated metallic screens
Protein Nanosheet Mechanics Controls Cell Adhesion and Expansion on Low-Viscosity Liquids
Adherent
cell culture typically requires cell spreading at the
surface of solid substrates to sustain the formation of stable focal
adhesions and assembly of a contractile cytoskeleton. However, a few
reports have demonstrated that cell culture is possible on liquid
substrates such as silicone and fluorinated oils, even displaying
very low viscosities (0.77 cSt). Such behavior is surprising as low
viscosity liquids are thought to relax much too fast
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