Study of the opto – electronic coupling in some complementary metallic – dielectric metamaterials used as biosensors

Abstract

Using of the metamaterials improves the sensitivity and resolution of sensor devices, having multiple applications in biomedicine (imaging, biomarkers, telemedicine, etc.). We have studied the effect of different types of ordering in the lattices of nanostructures inside the metamaterial samples. Structures consisting of metallic atoms (tens of nanometers diameter) arranged relative periodically in a dense dielectric matrix have been analyzed by simulation methods. We have focused on the opto-electronic coupling phenomena and the interactions between plasmons and the applied field. A study of the electron scattering processes was performed, the simulational data being used to calculate the reflectance and permittivity in function of the wavelength, in the range of 500…2300 nm. The electromagnetic properties of the metamaterial samples depending on particles shape, dimensions and on the reports between metallic inclusions dimensions and the dimensions of the dielectric matrix where are included have been studied and new configurations were proposed in order to improve the metamaterial sensors performance. We expect an increment in the response to the exciting field of about 7%, in a more dense state of spins characterising the new material samples.