European Journal of Applied Physics ISSN: 2684-4451 DOI: http://dx.doi.org/10.24018/ejphysics.2022.4.1.134 Vol 4 | Issue 1 | January 2022 52 Abstract — In the present work, we have investigated the light scattering from a Nickel metal cylinder under normal incidence. A double approach using the Fresnel reflectance model and Lorenz-Mie approach shows that the Fresnel model cannot follow the changes in the scattering regime when the size parameter changes. Experiments show that, even for large cylinders, the Fresnel model overestimates the effects of reflection in the forward direction. The simulation using the Lorenz-Mie formalism shows that as the size parameter changes the scattering regime changes and for size parameter lower than one the distribution of light intensity tends to become uniform and, for size parameter equal or lower than 0.1 the distribution is uniform and independent on the scattering angle, with a strong polarization around 70%. Keywords — Backscattering, Light Scattering, Nano-optics. I. INTRODUCTION 1 Understanding and controlling the properties of light scattering is of importance for various applications such as optical antennas, optical switching, sensing, photo-detection, light emission control, and solar cells [1]. Cylinders are common geometries that are found in the design of many devices [2] such as antennas, resonators, etc., moreover many natural structures can be modeled as cylinders (biological tissues, ice clouds…). The study of light scattering by such structures is of great importance in many aspects. Actually , with the advent of nanosciences it is important to study the behavior of such geometries when their dimensions reach or become smaller than the incident wavelength. On the other hand, it is also important to study the scattering regime when the dimensions are very large in comparison to the wavelength of the incident radiation. Among the multiple characteristics of the scattered field, there are its intensity distribution and polarization. We have systematically studied these two components for a nickel metallic cylinder. The light scattering by cylindrical bodies is of great interest in many disciplines. In the present work, we focus on the light scattering by a Nickel cylinder in the air; under normal incidence. We investigated the scattering through the Lorenz-Mie model, and we compared it with the Fresnel model. A simulation code is written using MATLAB software for the above named model, another code using the Fresnel reflection coefficients is also written for Transverse Magnetic (TM) and Transverse Electric (TE) modes. From the intensity distribution for each of the polarization the linear polarization is deduced. Finely we compare the Fresnel model with the experiment, using a cylinder which diameter is very large in comparison to the incident wavelength. The rest of the paper is organized as follows. Section II provides a brief introduction to the theory, simulation, and experiment of our body. In Section III, we present results and discussion on the scattering of the Transverse Magnetic (TM) and Transverse Electric (TE) modes of waves by a nickel cylinder. And we conclude in Section IV. II. METHODS A. Theory The theory used for computing our simulation is based on the formalism developed by Mie for bodies of spherical shapes [3] and later developed for cylindrical geometries [4], [5]. The theory gives a rigorous solution Submitted on November 12, 2021. Published on January 26, 2022. A. Kazadi Mukenga Bantu, Department of Physics, University of Kinshasa, Kinshasa, Democratic Republic of Congo; Department of Physics, Catholic University of Louvain-la-Neuve, Louvain-la-Neuve, Belgium. (e-mail: albert.kazadi unikin.ac.cd) T. Mabiala Masiala, Department of Physics, University of Kinshasa, Kinshasa, Democratic Republic of Congo; Department of Physics, Catholic University of Louvain-la-Neuve, Louvain-la-Neuve, Belgium. E. Phuku Phuati, Department of Physics, University of Kinshasa, Kinshasa, Democratic Republic of Congo. J. P. Mbungu Tsumbu, Department of Physics, University of Kinshasa, Kinshasa, Democratic Republic of Congo. P. Defrance, Department of Physics, Catholic University of Louvain-la-Neuve, Louvain-la-Neuve, Belgium. @ Double Approach in the Investigation of Light Scattering by a Nickel Metal Cylinder A. Kazadi Mukenga Bantu, T. Mabiala Masiala, E. Phuku Phuati, J.P. Mbungu Tsumbu, and P. Defrance