[01] Abel Sambou, Laboratory of Physics Solid and Sciences of Materials, Cheikh Anta Diop University, Dakar, Senegal. [02] Louis Gomis, Laboratory of Plasmas Physics and Interdisciplinary Research, Cheikh Anta Diop University, Dakar, Senegal. [03] Kharouna Talla, Laboratory of Physics Solid and Sciences of Materials, Cheikh Anta Diop University, Dakar, Senegal. [04] Alle Dioum, Laboratory of Physics Solid and Sciences of Materials, Cheikh Anta Diop University, Dakar, Senegal. [05] Aboubaker Chedikh Beye, Laboratory of Physics Solid and Sciences of Materials, Cheikh Anta Diop University, Dakar, Senegal.

Resonance frequency of silver nanoshells was investigated by numerical calculations based on the Drude correlation model to the Mie approximation. In a system of Ag atom coated with silica material. The optical properties of nanostructured architectures are highly sensitive to their composition, structures, dimensions, geometries and embedding mediums. Then the simulated absorption spectra of single-component metal nanoparticles and Ag@SiO ₂ nanoshell were calculated using both Mie and Drude model. We describe the benefits of plasmon resonance shaping by means of a simulation consisting in optimizing the plasmon frequency of multifunctional hybrid nanomaterials of the core/shell type. The discussion concerns the maximum absorption of the Ag/SiO₂ system identified at about 430 nm if the material is immersed in water. In the second phase, we modulated the SiO₂/Ag ratio to adapt it to the biological window. Thus, the various tests allowed us to conclude that to satisfy the question, the ratio of core radius (≈SiO₂) to shell thickness (≈Ag) must be significantly greater than 5. This has resulted in considerable insight concerning the variation of plasmon wavelength with nanoparticle size, shape and dielectric environment, as well as the use of these particles for optical sensing applications.

Drude Model, Mie Theory, Silver Nanoparticle, Silver Nanoshell, Surface Plasmon Resonance, Silica

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