PHOTONIC NANOSTRUCTURES WITH CONTROLLABLE AND MULTIFUNCTIONAL PROPERTIES Simion Astilean Babes-Bolyai University Faculty of Physics Molecular Spectroscopy Group Cluj-Napoca
Current challenge of nanofabrication To control: the size, shape, composition, spatial organization and chemical (biological) function of nanostructures Artificial nanostructures meet biomolecules
Main points of our research Developing an experimentally inexpensive method of controlled nanofabrication: The method is based on self-assembling process and nanosphere lithography and is able to fabricate large-area of highly ordered and shape-size-controlled nanostructures. Fabrication of multifunctional photonic nanostructures: Periodic arrays of noble-metal nanoparticles, Periodic arrays of nanoholes in metallic films, Photonic crystals, Self-assemblies of functionalized polymer nanospheres, Etc. Using light (photons) to extract and process information on the nanoscale: Optical bio-chemo-sensing, Ultrasensitive spectroscopic analysis, Photonics application, Etc.
Work on progress
Starting with self-assembly of polystyrene nanospheres SEM pictures of self-assembled monolayer of polystyrene nanospheres
AFM and SEM pictures of self-assembled multi-layers of polystyrene nanospheres
Using self-assemblies of polystyrene nanospheres as templates for nanolithography 1. Regular Arrays of Noble-Metal Nanoparticles 2. Regular Nanoscale Hole-Arrays in Noble-Metal Films
Applications
Nanostructures for optical chemo-bio-sensing applications Plasmon Light Metal Linker FG Biomolecule Plasmon 100 nm Nanosized optical biosensors based on surface plasmons resonances (SPR) Biomedical Conventional Advantages of this applications instruments approach l l l receptor-ligand interactions; DNA hybridization; enzyme-substrate interaction protein conformation studies label-free immunoassay; high-throughput screening in pharmaceutical industry; uses expensive sensor chips; limited reuse capacity; complex chemistry for ligand or protein immobilization l nanostructured support is cheap and easily synthesize; l can be coated with various proteins or protein-ligand complexes by charge adsorption; l monitored in any UV-vis spectrophotometre;
Surface Plasmon Resonances
Nanostructures for photonic applications Controlling the propagation, emission and detection of light on the nanoscale Novel spectroscopic tools for ultrasensitive analysis Novel class of optical materials Novel light sources Single Molecules Spectroscopic Fingerprint Photonic Crystals Zero-Threshold Lasers Fluorescence decay control Photonic Integrated Circuits Single - Photon Light Sources Surface Enhanced Raman Scattering (SERS) Telecommunication Devices Surface Enhanced IR Absorption (SEIRA) Quantum Information Devices
SERS Results
Fluorescence Decay Control
Interdisciplinary approach
Required techniques for fabrication, processing and characterization of nanostructures Structural Chemical Optical Other TEM Surface chemistry* UV-vis spectroscopy* Reactive ion etching AFM Metal film deposition XRD Nanosphere synthesis and functionalization Confocal optical microscopy Bioconjugation and linkage Fluorescence spectroscopy and lifetime measurements Raman spectroscopy* (micro. Raman, SERS) Infrared spectroscopy* * Our laboratory facilities Modeling and Computing techniques* RMN EPR
Groups already contacted and interested in this research National International 1. Centrul de Biologie Moleculara (Institutul de Cercetari Experimentale interdisciplinare al Univ Babes-Bolyai, Cluj-Napoca) 2. Laboratorul de Materiale Nanostructurate Avansate (INCDTIM, Cluj-Napoca) 3. Catedra de Macromolecule (Univ Tehnica Gh Asachi, Iasi) 4. Institutul National de Chimie Macromoleculara P. Poni (Iasi) 5. Centrul de Fizica Plasmei, (Facultatea de Fizica, Univ. Al I Cuza, Iasi) 1. Prof Sigrid Avrillier, Lasers Physics Laboratories, Paris University and SOPRA, France 2. Prof Gerard Bidan, Laboratoire d’Electrochimie Moleculaire et Structures des Interfaces, DRFMC, CEA, Grenoble, France. 3. Dr Anne Corval and Dr Patrice Baldeck, Laboratoire de Spectrometrie Physique, Univ Joseph Fourier Grenoble France 4. Prof Arnulf Materny, School of Engineering and Science, International University Bremen, Germany 5. Prof WL Barnes, School of Physics, University of Exeter, UK 6. Dr Gilad Haran, Single Molecule Laboratory, Weizmann Institute, Rehovot, Israel 7. Dr Victor Weiss, Optronic Center, ELOP Electrooptics Industries Ltd, Rehovot, Israel 8. Dr Peter Persephonis, University of Patras, Greece We are looking for partners…
Conclusions and Perspectives This project develops an experimentally simple technique for controlling the fabrication of nanostructures. The fabricated nanostructures have a real potential for relevant biosensing, photonics and ultrasensitive spectroscopic applications. This method of nanofabrication could be extended to semiconductors, polymer, ceramics and magnetic materials.
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