Optical properties behavior of ZnO nanoparticles deposited on glass in the ultraviolet-visible spectral range: Experimental and numerical study

In the realm of photonic devices, light-matter interaction has recently been a hot topic of study. In semi-conductors, absorption management is critical for device performance, especially in plasmonic waveguides. Nanoparticles made of zinc oxide (ZnO) demonstrate confinement effects in the ultraviolet and visible ranges, making it a well-known material for numerous photonic applications. Confined modes are ideal for applications needing high-efficiency coupling from single-photon emitters, such as ultra-sensitive optical sensor systems. In this paper, we have performed an experimental and numerical study of ZnO nanoparticles deposited on a glass substrate by the spray pyrolysis technique. The structural properties of our samples have been determined by X-ray diffraction study, which revealed satisfactory crystallization in the wurtzite phase with a preferred peak at (200) orientation. Experimental measurements and theoretical modeling are divided into two components in the optical study. In the region of 250-2500 nm, the experimental measurements are made with a (JASCO type V-570 double-beam spectrophotometer), we have obtained the results of transmittance reflectance and absorption as a function of wavelength. Lastly, we have injected the refractive indices n and k of ZnO into the calculation code derived from the experimental results. The optical behavior of ZnO nanoparticles deposited on glass has been studied numerically with differential methods in both optical far-field and near-field. The numerical calculation results were carried out with a spectral study in the range of 250-800 nm as a function of the incidence angle varying from 0 to 80. We notice the presence of two very high absorption peaks at wavelengths of 280 nm and 366 nm, respectively.

Automated summary

This paper investigates the structural properties and optical behavior of ZnO nanoparticles deposited on a glass substrate using the spray pyrolysis technique. The results show that these nanoparticles exhibit confinement effects in the ultraviolet and visible ranges, with high absorption peaks at specific wavelengths.