29 March 2013 Using confocal microscopy to characterize nanoplasmonic structures responsible for light transmission
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Abstract
The optical properties of nanostructured metallic nanofilms have been extensively studied in last few years. It was observed, for a wide variety of structures an enhancement in the transmission that can be explained as resulting from surface plasmon polaritons (SPP) waves propagating at the interface between the metallic film and the surrounding dielectric and/or substrate. In this work we utilize confocal microscope images as a useful tool to characterize the optical response of a set of concentric nanorings in the presence of SPP waves. We show for the first time the influence of the metal thickness on the light intensity profile. Reflected and transmitted light for concentric nanorings were observed under excitation of different laser wavelengths (405-633nm) as well as white light. Microscopy imaging with polarized light showed not only the spatial pattern of the radiation transmitted through these apertures but also a significant dependence of these patterns on the film thickness. The behavior was theoretically analyzed via basic principles as well as numerical simulation with standard software. A possible explanation is describing each ring as a source of radiation formed by two dipole systems, one electric dipole aligned to the applied electric field and a second one, a magnetic dipole, associated to a loop-antenna having an azimuthally non-homogeneous current dependence. This preliminary model is an ongoing study which may be useful to explain the behavior of the transmitted light. Analysis also showed the potential of confocal microscope for imaging nanostructures as well as for quantitative information on SPP excitation.
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Mariana T. Carvalho, Mariana T. Carvalho, Marcel Bezerra, Marcel Bezerra, Euclydes Marega, Euclydes Marega, Ben-Hur V. Borges, Ben-Hur V. Borges, Frederico D. Nunes, Frederico D. Nunes, } "Using confocal microscopy to characterize nanoplasmonic structures responsible for light transmission", Proc. SPIE 8634, Quantum Dots and Nanostructures: Synthesis, Characterization, and Modeling X, 86340G (29 March 2013); doi: 10.1117/12.2004396; https://doi.org/10.1117/12.2004396
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