Abstracts - Dipartimento di Elettronica Applicata

More documents

Recommendations

Info

Meta 2010 & FEM 2010 – Rome, 13-15 December 2010 Near-field numerical analysis of Surface Plasmon Polariton propagation on metallic gratings Gianluca Ruffato (1,2)* and Filippo Romanato (1,2,3)** (1) University of Padova, Department of Physics ‘G.Galilei’ Via Marzolo 8, 35131 Padova, Italy (2) LaNN Laboratory for Nanofabrication of Nanodevices, Corso Stati Uniti 4, 35127 Padova Italy (3) CNR-INFM IOM National Laboratory S.S. 14 Km 163.5, 34012 Basovizza Italy *E-mail:gianluca.ruffato@unipd.it **E-mail: romanato@tasc.infm.it Sinusoidal 1D metallic gratings are shown to efficiently couple the propagation of Surface Plasmon Polaritons (SPPs). Numerical simulations were performed in order to analyze the SPP excitation and propagation on these metallic gratings in the conical mounting. C-Method 1 was implemented to design the best grating profile and material choice so to optimize SPP coupling and optical response for applications in the bio-sensing field 2 . In recent papers we experimentally demonstrated benefits in sensitivity 3 and polarization phenomenology 4 that are originated by azimuthal rotation. Numerical simulations confirm these experimental results and complete the analysis with a study of SPP near-field on metallic surface: electromagnetic field intensity and polarization, out-of-scattering plane SPP propagation, multiple SPP excitation. The code allows describing the full optical behavior of this plasmonic grating also when coated with dielectric multi-layer that can be used as special substrates for sensing purposes. g) b) Figure 1 – a) Reflectivity dips for angular scan at azimuth �=40° and illuminating wavelength �=700nm for different incident polarization. Sinusoidal bimetallic Ag(37nm)-Au(7nm) grating on silicon substrate: period 500nm, amplitude 25nm. b) H-field z-component of excited SPPs on the grating surface xy and reconstruction of wavevector resonance sum kSPP = k|| - G, where k|| is the on-plane incident light momentum, G is grating momentum. References [1] J.Chandezon, M.T.Dupuis, G.Cornet J. Opt. Soc. Am. 72, 839-846, 1982 [2] J. Homola, Chemical Reviews 108, 462-493, 2008 [3] F. Romanato, K. H. Lee, H. K. Kang, G. Ruffato and C. C. Wong, Optics Express, 17, 12145, 2009 [4] F. Romanato, K. H. Lee, G. Ruffato, and C. C. Wong, Appl. Phys. Lett. 96, 111103, 2010 64
Meta 2010 & FEM 2010 – Rome, 13-15 December 2010 Accurate Circuit Modeling for Plasmon Probe Design Alessandro Massaro (1) , Diego Caratelli (2) , Alexander Yarovoy (2) , Roberto Cingolani (3) , and Athanassia Athanassiou (1),(4) (1) Italian Institute of Technology IIT, Center of Biomolecular Nanotechnologies Arnesano (Le), Italy – E-mail: alessandro.massaro@iit.it (2) IRCTR, Delft University of Technology, Mekelveg 4, Delft, The Netherlands (3) Italian Institute of Technology IIT- Genova- Italy. (4) National Nanotechnology Laboratory, Institute of Nanoscience of CNR of Lecce - Italy An accurate transmission line model for metallic plasmon probe design is proposed. The new approach is based on the simultaneous transverse resonance diffraction (STRD) [1] method which allows to evaluate the near field generated by a metallic wedge excited by surface plasmon wave. The generic model considers a metallic wedge in different dielectric materials as illustrated in Fig. 1 (a). By means of the resonance condition of the equivalent transmission line circuit of Fig. 1 (b) [1] we evaluate the singularity v of the electromagnetic field. This singularity is implemented in a multipole expansion of the Green’s function by providing the near field radiation pattern of Fig. 1 (c). The proposed approach is used for the design of metallic probes detecting variation of permittivity. (a) (b) (c) �� i+1 �� i �� i+1 �� i+1 �� i�� i�� 2 �� N �� 2 �� N-1 �� 2 �� N �� N �� 1 1 �� 1 �� Conductor �� N �� N �� N �� 65 �� 2 2 �� 2 �� Figure 1 – a) Metallic wedge in dielectric materials. b) Transmission line circuit for a generic metallic wedge profile. c) STRD near field radiation pattern for a gold metallic wedge with �=�/4 working at �0 =1 �m. References [1] A. Massaro, L. Pierantoni, R. Cingolani, and T. Rozzi, “A new analytical model of diffraction by 3D-dielectric corners,” IEEE Trans. on Antennas Propagat., 57, 2323-2330, 2009. ��
Page 1 and 2:
Meta 2010 & FEM 2010 - Rome, 13-15
Page 3 and 4:
Meta 2010 - Committees Chairmen Met
Page 5 and 6:
Meta 2010 & FEM 2010 - Rome, 13-15
Page 7 and 8:
Meta 2010 Foreword Ladies and Gentl
Page 9 and 10:
FEM 2010 Foreword Ladies and Gentle
Page 11 and 12:
Meta 2010 & FEM 2010 - Rome, 13-15
Page 13 and 14: Meta 2010 & FEM 2010 - Rome, 13-15
Page 25 and 26: Session FEM-1 Magnetic device model
Page 43 and 44: Session FEM-3 Methods and solvers M
Page 47 and 48: Session FEM-4 Design and applicatio
Page 63: Meta 2010 & FEM 2010 - Rome, 13-15
Page 67 and 68: Author Index Meta 2010 & FEM 2010 -
show all

Abstracts - Dipartimento di Elettronica Applicata

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?