The study of scattering and extinction properties of possible nanodiamond grains in the ISM are reported. Calculations using Discrete Dipole Approximation (DDA) for varying ellipsoidal shapes and sizes from 2.5 to 10 nm are considered. Nanodiamonds show negligible extinction from IR to near-UV and very sharp far-UV rise. Comparison with observations rule out possibility of independent nanodiamo...

New methods for the production of colloidal Ga nanoparticles (GaNPs) are introduced based on the evaporation of gallium on expendable aluminum zinc oxide (AZO) layer. The nanoparticles can be prepared in aqueous or organic solvents such as tetrahydrofuran in order to be used in different sensing applications. The particles had a quasi mono-modal distribution with diameters ranging from 10 nm to...

In this study, the nanosphere lithography (NSL) method was used to fabricate hybrid Au-Ag triangular periodic nanoparticle arrays. The Au-Ag triangular periodic arrays were grown on different substrates, and the effect of the refractive index of substrates on fabrication and optical properties was systematically investigated. At first, the optical spectrum was simulated by the discrete dipole a...

Gold nanorods (AuNRs) were assembled into highly packed two dimensional (2D) arrays with different structures by the Langmuir-Blodgett (LB) technique. The structure of the 2D arrays (the width of the arrays, the surface area and the shape of circular voids) was controlled by varying the applied surface pressure in the LB trough. Due to the shape anisotropy of AuNRs, both end-to-end (EE) and sid...

A numerical model for computing scattering from a three-dimensional (3-D) dielectric object above or below a rough interface is described. The model is based on an iterative method of moments solution for equivalent electric and magnetic surface current densities on the rough interface and equivalent volumetric electric currents in the penetrable object. To improve computational efficiency, the...

A Green’s function theory for the excitation of, and scattering from, particle chains is developed. AZ transform is applied to the discrete dipole approximation of the chain, and the chain’s spectral properties are explored in the complex Z plane. It is shown that a continuous spectrum may be excited, and the roles of the discrete and continuous spectra in the chain response are studied. The la...