Use of dielectric nanoparticles placed at the anode (indium tin oxide) for the improvement of light-extraction efficiency of an organic light-emitting diode (OLED) has been reported. The nanoparticle layer will act as a scattering medium for the light trapped in the waveguiding modes of the device. Mie theory has been applied to study the scattering efficiency of the isolated dielectric nanoparticle. The effect of dielectric nanoparticles on the light-extraction efficiency of OLED has been analyzed by the finite-difference time-domain method. The light-extraction efficiency of the device depends upon the diameter, interparticle separation, and refractive index of dielectric nanoparticles. At optimal nanoparticle parameters, the enhancement factor of 1.7 times is obtained with the proposed design.
We report fabrication of a segmented cladding fiber (SCF) in silica-based glass. An SCF with a uniform core of pure silica and cladding of periodically arranged pure silica and fluorine-doped silica in an angular direction has been fabricated by using the stack-and-draw technique. The fabricated fiber has been characterized by capturing its near-field intensity pattern at 633 nm wavelength. The number of modes has been estimated from the captured near-field intensity pattern by using neural network analysis. A four-segment SCF of 30-μm core diameter and 0.43% relative index differences between the high- and low-index segments shows few-mode operation by filtering out higher-order modes of an otherwise highly multimode fiber.
In this paper design of a fiber having ultra-flattened dispersion with small dispersion slope, ultra-large effective area over a wide spectral range has been presented. The segmented core of the fiber helps in achieving large mode field diameter and maintaining very small dispersion over a wide range of wavelengths. The maximum value of dispersion and dispersion slope of the designed fiber is −1.4 ps/km/nm and 0.047 ps/km/nm<sup>2</sup> respectively within the spectral range of 1460-1666 nm. The proposed fiber has ultrahigh effective area ranging from 116 μm<sup>2</sup> to 504 μm<sup>2</sup> in the aforementioned wavelength range, which covers the entire S+C+L-band.