Abstracts - Dipartimento di Elettronica Applicata
Abstracts - Dipartimento di Elettronica Applicata
Abstracts - Dipartimento di Elettronica Applicata
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Meta 2010 & FEM 2010 – Rome, 13-15 December 2010<br />
Near-field numerical analysis of Surface Plasmon<br />
Polariton propagation on metallic gratings<br />
Gianluca Ruffato (1,2)* and Filippo Romanato (1,2,3)**<br />
(1) University of Padova, Department of Physics ‘G.Galilei’ Via Marzolo 8, 35131 Padova,<br />
Italy<br />
(2) LaNN Laboratory for Nanofabrication of Nanodevices, Corso Stati Uniti 4, 35127 Padova<br />
Italy<br />
(3) CNR-INFM IOM National Laboratory S.S. 14 Km 163.5, 34012 Basovizza Italy<br />
*E-mail:gianluca.ruffato@unipd.it **E-mail: romanato@tasc.infm.it<br />
Sinusoidal 1D metallic gratings are shown to efficiently couple the<br />
propagation of Surface Plasmon Polaritons (SPPs). Numerical simulations<br />
were performed in order to analyze the SPP excitation and propagation on<br />
these metallic gratings in the conical mounting. C-Method 1 was implemented<br />
to design the best grating profile and material choice so to optimize SPP<br />
coupling and optical response for applications in the bio-sensing field 2 . In<br />
recent papers we experimentally demonstrated benefits in sensitivity 3 and<br />
polarization phenomenology 4 that are originated by azimuthal rotation.<br />
Numerical simulations confirm these experimental results and complete the<br />
analysis with a study of SPP near-field on metallic surface: electromagnetic<br />
field intensity and polarization, out-of-scattering plane SPP propagation,<br />
multiple SPP excitation. The code allows describing the full optical behavior<br />
of this plasmonic grating also when coated with <strong>di</strong>electric multi-layer that can<br />
be used as special substrates for sensing purposes.<br />
g) b)<br />
Figure 1 – a) Reflectivity <strong>di</strong>ps for angular scan at azimuth �=40° and illuminating wavelength<br />
�=700nm for <strong>di</strong>fferent incident polarization. Sinusoidal bimetallic Ag(37nm)-Au(7nm) grating<br />
on silicon substrate: period 500nm, amplitude 25nm. b) H-field z-component of excited SPPs<br />
on the grating surface xy and reconstruction of wavevector resonance sum kSPP = k|| - G, where<br />
k|| is the on-plane incident light momentum, G is grating momentum.<br />
References<br />
[1] J.Chandezon, M.T.Dupuis, G.Cornet J. Opt. Soc. Am. 72, 839-846, 1982<br />
[2] J. Homola, Chemical Reviews 108, 462-493, 2008<br />
[3] F. Romanato, K. H. Lee, H. K. Kang, G. Ruffato and C. C. Wong, Optics Express, 17,<br />
12145, 2009<br />
[4] F. Romanato, K. H. Lee, G. Ruffato, and C. C. Wong, Appl. Phys. Lett. 96, 111103, 2010<br />
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