STUDY OF THE FLUORESCENT PROPERTIES OF FLUORESCEIN DEPOSITED ON POROUS SILICON DIELECTRIC MIRRORS

We report the study of the optical properties of Fluorescein-5-maleimide (FM) molecules infiltrated in porous silicon dielectric Bragg reflectors (DBR). Based on the characterization results of porous silicon (PSi) single layers obtained by an electrochemical anodizing process of Si in a two electrodes Teflon cell, the DBRs were synthesized. Then, the as anodized DBRs were silanized with a 3-mercaptopropyltrimethoxysilane (MPTS) solution and functionalized in FM solutions at different concentrations. Cross section scanning electron micrographs show that the DBRs synthesis was successful. After each preparation step, Reflectance, Raman and Fluorescence (FL) spectra were recorded. Raman spectra show a greater FM infiltration at the higher FM concentrations in solution. Consequently, the FL spectra show an enhancement in the FL intensity probably due to a constructive interference of the DBR reflected beams and the FM fluorescence emission.