Abstracts - Dipartimento di Elettronica Applicata

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Meta 2010 & FEM 2010 – Rome, 13-15 December 2010 Session MTM-6 Optical metamaterial applications Chairman: F. Frezza, “Sapienza” University 11:20-11:40 A. Massaro, F. Spano, R. Cingolani, and A. Athanassiou Pillar type PDMS nanocomposite optical antenna for liquid detection systems 11:40-12:00 R. Marinelli and E. Palange Optical performances of micron-sized CMOS image sensors using metallic planar lenses 12:00-12:20 A. Benedetti, M. Centini, C. Sibilia, M. Bertolotti Second harmonic generation in gold nanoantennas 12:20-12:40 S. Tricarico, F. Bilotti, and L. Vegni Controlling optical forces on nanoparticles through metamaterials 56
Meta 2010 & FEM 2010 – Rome, 13-15 December 2010 Pillar Type PDMS Nanocomposite Optical Antenna for Liquid Detection Systems Alessandro Massaro (1) , Fabrizio Spano (1) , Roberto Cingolani (2) , and Athanassia Athanassiou (1),(3) (1) Italian Institute of Technology IIT, Center of Biomolecular Nanotechnologies Arnesano (Le), Italy – E-mail: alessandro.massaro@iit.it (2) Italian Institute of Technology IIT- Genova, Italy. (3) National Nanotechnology Laboratory, Institute of Nanoscience of CNR of Lecce – Italy In this work we propose a new pillar sensor device suitable for detection of liquid’s permittivity. Due to the ability to generate gold nanoparticles starting from gold precursors by chemical reduction [1], polydimethylsiloxane (PDMS) polymer is used. A pillar type layout is chosen in order to collect and radiate the signal in an optical fiber probe. The radiated signal is enhanced by the light scattering of the gold micro/nano particles and allows to perform an high detection sensitivity during the deposition of an ethanol droplet on the sensor: as shown in Fig. 1 (a) a reduction of the transmitted light intensity is observed when the ethanol is detected. The detection corresponds to a variation of the dielectric contrast dn due to the presence of ethanol. In Fig. 1 (b) is reported the experimental setup used for the measurements. The sensor is also able to measure the evaporation effect of the ethanol droplet. Optical radiated intensity [a.u.] 2200 2000 1800 1600 1400 1200 1000 800 600 Broad lamp source Multimode optical fiber 400 800 900 1000 1100 1200 1300 1400 �[nm] OMA Multimode (a) optical fiber (b) PDMS-Au pillar PDMS-Au pillar+ ethanol dn 57 Optical fiber probe Optical fiber source Pillar type sensor Figure 1 – a) PDMS-Au pillar type sensor and detection of ethanol as reduction of the optical transmitted intensity. Inset below: image of the fabricated PDMS-Au prototype with the height of a single pillar of 1.5 mm, the diameter of 1 mm and the side of the square layout of 2.5 mm. Inset above: schematic diagram of the used experimental setup. b) Experimental setup. References [1] Q. Zhang, J. J. Xu, Y. Liu, and H. Y. Cuen, “In-situ synthesis of poly(dimethylsiloxane)- gold nanoparticles composite filmsand its application in microfluidic system,” Lab on chip, 8, 352-357, 2008.
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Abstracts - Dipartimento di Elettronica Applicata

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