The absolute phase refractive index n relates the phase velocity v in matter to the vacuum light velocity c(n » civ). It is determined by the molecular polarizability of the medium and gives insight to the interaction of light with matter and the structure of substances. 3 Additionally the group refractive index ng is needed to describe light pulse propagation, 4 5 which is defined as the ratio...

The refractive-index contrast is an important figure of merit for dielectric multilayer structures, optical resonators, and photonic crystals. This represents a strong driving force for novel materials that have refractive indices lower than those of conventional optically transparent materials. Silica nanorod-array dielectric films with unprecedented low refractive indices of 1.08 are demonstr...

Distributions of ellipsoids are often used to simulate the optical properties of non-ellipsoidal atmospheric particles, such as dust. In this work, the applicability of ellipsoids for retrieving the refractive index of dust-like target model particles from scattering data is investigated. This is a pure modeling study, in which stereogrammetrically retrieved model dust shapes are used as target...

In this paper, we study the propagation properties of twisted Hermite–Gaussian Schell- model (THGSM) beams propagating in a uniaxial crystal orthogonal to optical axis. We derive concrete analytical expression cross-spectral density (CSD) function and simulate evolution characteristics such beams, including normalized spectral intensity, degree coherence (DOC), effective beam width. find that i...

Parenteral nutrition (PN) solution contains various concentrations of dextrose, amino acids, lipids, vitamins, electrolytes, and trace elements. Incorrect preparation of PN solution could lead to patient death. In this study we used the refractive index as a quality assurance tool to monitor the preparation of PN solution. Refractive indices of single nutrient components and PN solutions consis...

Lactose, the disacch arid e commonly known as milk sugar , has for many years been of commercial impor tance. U nt il r ecently i ts principal usc was in the manufacture of pharmaceu ticals, food products, and in th e preparation of modifi ed di ets; however, the penicillium industry now also r equires large quantiti es of this sugar. ! In th e presen t investigation measurements h ave been mad...