book of abstracts - IM2NP

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A B S T R A C T S TUESDAY, JUNE 29 N A N O S E A 2 0 1 0 emission with the required operating wavelengths (C-band, 1530 - 1560 nm). X-ray Interference Lithography (XIL) has been chosen as the preferential technique to produce the gratings that provide the optical feedback. 2 – Abstract In the last years optical gain from organic active media has been observed at different wavelengths lying in the near-IR region (up to 1300 nm) [1-3] but still far from the wavelengths required for the optical communications. P. Del Carro et al. have recently fabricated a distributed feedback (DFB) laser tunable in the range of 890 - 930 nm [4]. Here we present an organic DFB laser exploiting the 4f – 4f transition at 1535 nm of the Er ion coordinated to the three Quinoline groups of the ErQ3 molecule. A film of amorphous ErQ3 is deposited by Vacuum Thermal Evaporation on a periodically modulated surface obtained by XIL. According to the Bragg condition with the first order of emission (m=1) at 1535 nm, a 472 nm‐pitch has been calculated for the DFB cavity and reproduced on the samples with nanometric precision. XIL represents the obvious choice to obtain periodic structures, with its capacity to engrave (in few minutes) large areas of photoresist (~ 1 mm2) with nanometer (100 nm) size ordered patterns without making use of masks. The XIL tool is a low-cost apparatus made of a table-top coherent X-ray source and a simple Lloyd‟s setup where the interference patterns are produced by reflection of one half of the laser beam that overlaps with the undeflected half in correspondence of the sample surface [5]. The X-ray laser source is a prototype capillary discharge plasma source developed at the University of L‟Aquila and emitting 1.5 ns long pulses of coherent radiation at λ = 46.9 nm with 0.1 Hz maximum repetition rate, exploiting the single pass amplification of the 3p-3s transition in Ne-like Ar [6]. The effects of the grating surface modulation on the emission properties have been studied as a function of the grating period (easily and cheaply tunable with the XIL technique) and of the organic layer thickness. A morphological characterization has been performed by Atomic Force Microscopy on both the grating surface and the active layer surface. Detailed X-Ray Photo-Emission Spectroscopy measures have been performed to complete the characterization of the device. 3 – Conclusion The largely diffused use of wide-band optical networks and the increasing request of improving their performance are pushing toward the concept of an all-optical information processing. The fabrication of a miniaturized organic laser for C-band applications is a step toward an all-optical scenario. The technological impact of the novel device will depend on the possibility to adopt the on-chip optical interconnection strategy diffusely: the low costs of constituent materials and fabrication techniques are the premise for a vast diffusion of the ErQ3-based laser throughout the network. [1] M. Casalboni, F. De Matteis, V. Merlo, P. Prosposito, R. Russo and S. Schutzmann, Appl. Phys. Lett. 83, 416 (2003). [2] K. Yamashita, T. Kuro, K. Oe and H. Yanagi, Appl. Phys. Lett. 88, 241110 (2006). [3] J. Thompson, M. Anni, S. Lattante, D. Pisignano, R. I. R. Blyth, G. Gigli and R. Cingolani, Synth. Met. 143, 305 (2004). [4] P. Del Carro, A. Camposeo, R. Stabile, E. Mele, L. Persano, R. Cingolani, and D. Pisignano, Appl. Phys. Lett. 89, 201105 (2006). [5] P. Zuppella, D. Luciani, P. Tucceri, P. De Marco, A. Gaudieri, J. Kaiser, L. Ottaviano, S. Santucci and A. Reale, Nanotechnology, 20 (2009), 115303. [6] A. Ritucci, G. Tomassetti, A. Reale, F. Flora and L. Mezi, Phys. Rev. A 70, 023818 (2004). 57
P R O G R A M WEDNESDAY, JUNE 30 N A N O S E A 2 0 1 0 Wednesday, June 30 Session 8 Room Calendal Organic Nanostructures (Chairman: De Crescenzi) 8H30-9h00 TEICHERT (a Institute of Physics, University of Leoben, A-8700 Leoben, Austria; b Chair of Atomistic Modelling and Design of Materials, University of Leoben, A-8700 Leoben, Austria; c Institute of Solid State Physics, Graz University of Technology, A-8010 Graz, Austria) Molecular diffusion processes in nanostructured organic thin films 9H00-9H20 GIOVANELLI (1 IM2NP-CNRS, Aix-Marseille Université, Campus de St. Jérôme, Marseille, France, 2 Humboldt University, Institut für Physik, Newtonstraße 15, 12489 Berlin, Germany, 3 PIIM-CNRS, Aix-Marseille Université, Campus de St. Jérôme, Marseille, France, 4 ELETTRA, Sincrotrone Trieste, Area Science Park, S.S. 14, km 163.5, Basovizza (Trieste), Italy) Valence band photoelectron spectroscopy of the Zn-Phthalocyanine/Ag(110) interface: Charge transfer and scattering of substrate photoelectrons 9H20-9H40 PERTRAM (Institute of Physical and Theoretical Chemistry, University of Bonn, Wegelerstr.12, D-53115 Bonn, Germany, *CINAM – CNRS – UPR 3118, Aix-Marseille Université, Campus de Luminy – Case 913, F- 13288 Marseille, France) Phthalocyanine induced nanostructuring of the Au(110) surface 9H40-10H00 SCHNEIDER (Institute of Physical and Theoretical Chemistry, University of Bonn - Wegelerstr. 12 D-53115, Bonn, Germany) Self-organized Porphyrin monolayers on halide-modified noble metal surfaces 10H00-10H20 MAS-TORRENT (Institut de Ciència de Materials de Barcelona (CSIC), Campus de la UAB E-0183, Bellaterra, Spain; Katholieke UniVersiteit LeuVen, Celestijnenlaan 200-F, 3001 Heverlee, Belgium; Université de Mons-Hainaut, 20, Place du Parc, B-7000 Mons, Belgium; Laboratory of Supramolecular Chemistry and Technology MESA+ Research Institute, University of Twente, P.O. Box 217, NL-7500 AE Enschede, The Netherlands) Self-assembly of electroactive polychlorotriphenylmethyl organic radicals on surfaces: molecular switches and molecular wires 10H20-10H50 Coffee Break 58
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