Presentation on theme: "Babes-Bolyai University Molecular Spectroscopy Group"— Presentation transcript:
1 Babes-Bolyai University Molecular Spectroscopy Group PHOTONIC NANOSTRUCTURES WITH CONTROLLABLE AND MULTIFUNCTIONAL PROPERTIESSimion AstileanBabes-Bolyai UniversityFaculty of PhysicsMolecular Spectroscopy GroupCluj-Napoca
2 Current challenge of nanofabrication To control: the size, shape, composition, spatial organization and chemical (biological) function of nanostructuresArtificial nanostructures meet biomolecules
3 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,
5 Starting with self-assembly of polystyrene nanospheres 1. Drop ~120 L colloid soln.onto hydrophillic substrate.2. Dry in oven, spheres self assembleat meniscus edge.
6 SEM pictures of self-assembled monolayer of polystyrene nanospheres Starting with self-assembly of polystyrene nanospheresSEM pictures of self-assembled monolayer of polystyrene nanospheres
7 AFM and SEM pictures of self-assembled multi-layers of polystyrene nanospheres
8 Using self-assemblies of polystyrene nanospheres as templates for nanolithography 1. Thermally evaporate layerof silver or gold ontothe polystyrene nanospherearray.2. Combining nanosphere lithography with Reactive Ion Etching (RIE)
9 Using self-assemblies of polystyrene nanospheres as templates for nanolithography 1. Regular Arrays of Noble-Metal Nanoparticles2. Regular Nanoscale Hole-Arraysin Noble-Metal Films
10 Photonics Properties of Regular Arrays of Noble-Metal Nanoparticles Optical response of noble metal nanoparticles is dominated by the Localized Surface Plasmon Resonance (LSPR).Large near-field enhancement relative to incident field.Tunable Optical Response by altering particle size, shape, environment and proximity.
11 Photonic Properties of Nanoscale Hole-Arrays in Metallic Films Periodic structure of hole-arrays enables coupling light to surface plasmon (SP) mode.Evanescent field emerges through holes and is coupled to radiative modes.Giant optical transmission of sub-wavelength apertures.
12 (C) Combining Nanosphere Lithography with Reactive Ion Etching (RIE) 1. Etch nanosphere array in an oxygen plasma2. Remove nanospheres leaving hexagonal array of holes in a metal film
16 Nanostructures for optical chemo-bio-sensing applications MetalLightPlasmon100 nmLinkerBiomoleculeFGNanosized optical biosensors based on surface plasmons resonances (SPR)Biomedical applicationsConventional instrumentsAdvantages of this approachreceptor-ligand interactions;DNA hybridization;enzyme-substrate interactionprotein conformation studieslabel-free immunoassay;high-throughput screening in pharmaceutical industry;uses expensive sensor chips;limited reuse capacity;complex chemistry for ligand or protein immobilizationnanostructured support is cheap and easily synthesize;can be coated with various proteins or protein-ligand complexes by charge adsorption;monitored in any UV-vis spectrophotometre;
18 Nanostructures for photonic applications Controlling the propagation, emission and detection of light on the nanoscaleNovel spectroscopic tools for ultrasensitive analysisNovel class of optical materialsNovel light sourcesSingle Molecules Spectroscopic FingerprintFluorescence decay controlSurface Enhanced Raman Scattering (SERS)Surface Enhanced IR Absorption (SEIRA)Photonic CrystalsPhotonic Integrated CircuitsTelecommunication DevicesZero-Threshold LasersSingle - Photon Light SourcesQuantum Information Devices
22 Required techniques for fabrication, processing and characterization of nanostructures StructuralChemicalOpticalOtherTEMAFMXRDConfocal optical microscopySurface chemistry*Nanosphere synthesisand functionalizationBioconjugation and linkageUV-vis spectroscopy*Fluorescence spectroscopy and lifetime measurementsRaman spectroscopy* (microRaman, SERS)Infrared spectroscopy*Reactive ion etchingMetal film depositionModeling and Computing techniques*RMNEPR* Our laboratory facilities
23 We are looking for partners… Groups already contacted and interested in this researchNational1. 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)International1.Prof Sigrid Avrillier, Lasers Physics Laboratories, Paris University and SOPRA, France2.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 France4.Prof Arnulf Materny, School of Engineering and Science, International University Bremen, Germany5. Prof WL Barnes, School of Physics, University of Exeter, UK6.Dr Gilad Haran, Single Molecule Laboratory,Weizmann Institute, Rehovot, Israel7.Dr Victor Weiss, Optronic Center, ELOP Electrooptics Industries Ltd, Rehovot, Israel8.Dr Peter Persephonis, University of Patras,Patras, GreeceWe are looking for partners…
24 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.