In this paper, we analyze the transmission properties of metallic gratings at optical frequencies. In particular, we show that an inherently ultra-broadband tunneling mechanism may be obtained based on impedance matching between the guided modes supported by ultranarrow slits and freespace TM plane waves impinging at an oblique angle. This phenomenon is the analogous of the well-known Brewster ...

The effect of a nonzero sidewall angle on the performance of multiple layer fishnet-structure one to three functional layers negative index metamaterials is evaluated experimentally. The fabrication-induced sidewall angle results in a bianisotropy inhomogeneous asymmetry that is significant at optical frequencies. Good agreement is obtained between the experimental transmission and reflectance ...

Due to cost effectiveness and less electrical fault hazards, the HVDC transmission is more suitable for long distance power transmission than that for the conventional AC transmission system. Moreover the utilization of power electronics has made HVDC technology competitive and reliable in comparison to HVAC system. The controlling mechanism of the DC link (either monopolar or bipolar) is the m...

Light traveling from a medium with a high refractive index to a low refractive index experiences total refl ection when the incident angle exceeds the critical angle. The case of 100% refl ection is called total internal refl ection (TIR), in which case the light is confi ned within the medium having the higher refractive index. This phenomenon is used in optical transmission fi bers and light ...

Comparisons between predictions of a Biot-Allard model allowing for angle-dependent elasticity and angle-and-porosity dependent tortuosity and transmission data obtained at normal incidence on water-saturated replica bones are extended to oblique incidence. The model includes two parameters which are adjusted for best fit at normal incidence. Using the same parameter values, it is found that pr...

The effect of the tilt angle of metal film on the transmissivity of subwavelength holes in optically thick metal film is investigated. The transmission efficiency is found can be highly dependent on the tilt angle. It is also found that when the input photons are polarized not along the eigenmode directions of surface plasmon polariton, a birefringent phenomenon is observed when the array with ...

Most methods for measuring light-tissue interactions focus on the volume reflectance while very few measure the transmission. We investigate both diffusion reflection and diffuse transmission at all exit angles to receive the full scattering profile. We also investigate the influence of blood vessel diameter on the scattering profile of a circular tissue. The photon propagation path at a wavele...

Variable-angle high-angle annular dark-field (HAADF) imaging in scanning transmission electron microscopy is developed for precise and accurate determination of three-dimensional (3D) dopant atom configurations. Gd-doped SrTiO3 films containing Sr columns containing zero, one, or two Gd dopant atoms are imaged in HAADF mode using two different collection angles. Variable-angle HAADF significant...

Mesoporous semimetal bismuth film and magnetic metal nickel and cobalt thin films have been electrodeposited from hexagonal or lamellar structured lyotropic liquid crystalline phases with polyoxyethylene surfactant. The liquid crystalline templates are characterized by low-angle X-ray diffraction (XRD) and polarized-light optical microscopy (POM). The metal films are characterized by low-angle ...

A poly(acrylic acid)±surfactant±multi-walled carbon nanotube complex was prepared and characterized using transmission electron microscopy, scanning electron microscopy, wide-angle X-ray di€raction and small-angle X-ray di€raction. The complex was found to retain a lamellar structure, and helped micrometer-length multi-walled carbon nanotube dissolve in organic solvents. Its nonlinear optical p...