Research on Plasmonic Properties of Metal Island Films
Dr. Hrvoje Zorc
Division of Laser and Atomic R&D, Ruder Boskovic Institute, Zagreb
14:30 - 15:30 Tuesday 22 January 2013 KFU HS 05.01 During the last 7 years research on metal island films (MIF) is being intensified at the Division. It started originally with basic characterization using available nondestructive tools (spectrometry, spectroscopic ellipsometry, AFM, GISAXS) as part of an Austria-Croatia bilateral project. Then it continued with characterization of embedded metal island films and designing novel optical multilayers systems, as well as influence of intensive electrical fields to MIFs.
At present the following research topics are in progress and will be presented:
Metal nanoparticle clusters excited by "non-standard" beams
The electromagnetic response of metal nanoparticles is characterized by excitation of plasmon resonances. Usually, this response is calculated assuming homogeneous plane-wave-like excitation. We have extended the generalized Mie theory to study the electromagnetic behavior of metal nanoparticle clusters excited under different illumination conditions, such as tightly focused plane
waves or cylindrical vector beams. Our simulations show that control on the spatial distribution of light polarization enables quenching of bright plasmon modes and efficient excitation of dark modes.
Dispersion models for metal island films for sensing purposes
The goal is to obtain parametric dispersion models that can accurately describe the optical behavior of MIFs and quantitatively correlate it with the eposition conditions. These models could enable tailoring the MIFs properties by adjusting the deposition parameters and optimizing the sensitivity of MIFs by analysis of the full plasmonic lineshape.
Full wave simulations of a large area of random metal island films with complex morphology
In order to simulate their electromagnetic behavior the use of classical Mie theory or similar analytical methods is not convenient. The use of numerical algorithms such as FDTD (finite differences time domain) is required in order to get accurate results. The drawback of this method is a heavy computational load both on the computer resources and simulation time. We are aiming at the
development of an accurate and fast simulation model that nevertheless incorporates realistic complex particle shapes.
Meet-the-speaker tea: 14.10 Uhr , Bibliothek Experimentalphysik
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