Abstract
Abstract The use of glancing angle deposition technique provides opportunities for the deposition of sculptured nanostructures of different shape. The optical properties of such nanostructures that are a function of the shape of these nanostructures may be investigated, using the discrete dipole approximation theory which is an appropriate method for solving the light scattering problem from objects of different shape and geometry. In this paper, the extinction spectra of Ag/glass-sculptured nano-flowers with threefold symmetry are modeled and calculated, while the results are compared with similar experimental observations. In modeling the nano-flower-shaped sculptured thin films, it is proposed that the nano-flower is formed as a combination of two chiral thin films with different dimensions. This structure was replaced with 1,405 electrical dipoles, and its extinction spectrum was calculated as a function of incident light angle and azimuthal angle. The extinction spectrum consists of both transverse and longitudinal modes of oscillations. The results showed that by increasing the incident angle, due to increase of amplitude of electrical oscillations, transverse oscillations shift towards longer wavelengths. It was also observed that at azimuthal angles close to nano-flower petals, where sharp points or recesses may exist, the intensity of extinction spectrum for longitudinal mode (long wavelengths in the extinction spectrum) increases.
Highlights
Semiconductor nanostructures have attracted great interest for studding the quantum confinement effect and thermodynamic structures of these materials [1,2,3]
Three distinct stages existed in the catalyst-assisted growth of Zinc sulfide (ZnS) nanowires
ZnS nanowires were grown with Au nanoparticles in top of them
Summary
Semiconductor nanostructures have attracted great interest for studding the quantum confinement effect and thermodynamic structures of these materials [1,2,3]. The present study developed a novel technique for growing ultra-long ZnS nanowires on thin-catalyst-coated substrates. CVD allows proper control on the deposition rate and pressure temperature so as to prepare and Journal of Theoretical and Applied Physics (2018) 12:121–126 maintain the desired structure, composition and size of the materials.
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