Abstract
This paper investigates the spontaneous decay rate of elliptical plasmonic nanostructures. The refractive index was analyzed using the effective medium theory (EMT). Then, the polarizability, spontaneous radiative, non-radiative decay rate, and electric field enhancement factor were characterized for the targeted elliptical nanostructures at different aspect ratios. All of the optical analyses were analyzed at different distances between the excited fluorescent coupled atom and the plasmonic nanostructure (down to 100 nm). This work is promising in selecting the optimum elliptical nanostructure according to the required decay rates for optical conversion efficiency control in energy harvesting for solar cells and optical sensing applications.
Highlights
Nanotechnology has been a major focus of scientific attention over past decades, exhibiting an exponential growth for the number of publications in plasmonic nanostructures (NSs) and light scattering in several such plasmonic materials like silver nanorods and gold nanoparticles [1]
Unlike radiative decay rate analysis, the separation distance d does not affect the spectral behavior of non-radiative analysis, the separation distance d does not affect the spectral behavior of non-radiative decay rate
Using the refractive index analysis via effective medium theory (EMT), difdifferent optical characterizations have been analyzed such as polarizability, spontaneferent optical characterizations have been analyzed such as polarizability, spontaneous ous radiative/non-radiative decay rates, and enhancement factor
Summary
Nanotechnology has been a major focus of scientific attention over past decades, exhibiting an exponential growth for the number of publications in plasmonic nanostructures (NSs) and light scattering in several such plasmonic materials like silver nanorods and gold nanoparticles [1]. It is important to know how to match the fluorescent properties of the NPs with the detected molecule and to improve the selectivity of the detection [26].Different plasmonic nanostructures, such as gold and silver formed as nanorod, spheroid, sphere, ellipsoid, and half ellipsoid (moth-eye) lead to enhance the electric field around them to the surrounding medium which improves the optical coupling of any fluorescent emission matched with surface plasmonic resonance (SPR) wavelength [56,57,58,59,60]. We used the EMT to calculate the effective properties such as the effective RI and the effective polarizability in order to calculate both effective spontaneous radiative and non-radiative decay rates, and effective enhancement factor with taking the geometrical shape of the plasmonic nanostructures into account, such as ellipsoid, sphere, and spheroid We analyzed this calculation at different distances between the excited.
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