A semi-analytical technique to determine the propagation constant of periodically segmented Ti:LiNbO3 waveguide (PSW) is described. The 2-D refractive index profiles of the waveguide segments are computed from its fabrication parameters, such as, Ti-layer thickness and width, and the diffusion parameters. WKB method is used to transform 2-D refractive index profile to 1D lateral effective index...

In this work, nonlinear refraction properties of gold (Au) and platinum (Pt) nanoparticles dispersed in the water are reported. The thermally induced effective nonlinear refractive index due to nonlocal heat effect is characterized by Zscan technique with a low power continuous wave (CW) laser at 1064 nm. This allows us to measure thermo-optic coefficient and effective nonlinear refractive inde...

Fundamental properties such as mode field distribution, real effective refractive index, imaginary effective refractive index, confinement loss of two new kinds of honeycomb photonic crystal fibers are successfully studied by using Full-Vectorial Finite element method (FV-FEM). Low confinement loss 0.1×10dB/km is achieved at wavelength 1.55μm in hollow core honey comb PCF by removing 6-air hole...

This paper presents a new approach to determining the effective refractive index of single living cell. By means of it, the refractive index of living cell can be automatically measured in real time without any extra treatments on the cell, meanwhile, offering low cost and high accuracy of disease diagnosis.

We dispute Grigorenko's statement [Opt. Lett. 31, 2483 (2006)] that measuring only the reflection intensity spectrum is sufficient for determining the effective refractive index. In addition, our simulations do not confirm his conclusions regarding the negative refractive index and the negative permeability of the nanopillar sample in the visible range.

The material in the resonant layer (RL) of ‘f.1’ consists of nanometer-sized iron particles in an InGaAsP host layer above the InP p-cladding a common 1.55 m multi-quantum well (MQW) laser structure as shown in Table III. InGaAsP has a refractive index of 3.4 which is higher than the refractive index of the InP pclad which is 3.16. These values satisfy the need to have the real part of the refr...

THz time-domain spectroscopy is used to measure the frequency dependent (0.2– 2.0 THz) complex refractive index of a pure liquid crystal (LC), 40-n-pentyl-4-cyanobiphenyl (5CB), and its LC colloids with SiO2 particles. While the refractive index of the pure LC is found to vary markedly due to distinct orientated domains within the sample, the LC colloids provide us with very stable and reproduc...

We introduce a mechanism for creating artificial high refractive index metamaterials by exploiting the existence of subwavelength propagating modes in metallic systems. As an example, we investigate analytically and numerically metal films with a periodic arrangement of cut-through slits. Because of the presence of TEM modes in the slits, for TM polarization such a system can be rigorously mapp...

The modified unrestricted effective-medium refractive index is defined as one that yields accurate values of a representative set of far-field scattering characteristics (including the scattering matrix) for an object made of randomly heterogeneous materials. We validate the concept of the modified unrestricted effective-medium refractive index by comparing numerically exact superposition T-mat...