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Future optics and electronics
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  Future optics and electronics

Optical field around a gold 40 nm in diameter and 4 microns in length nano rod, induced by an incident laser wave. (Équipe LEPO).

Future optics and electronics :  Building a device (electronic, magnetic, photonic, sensor ...) at the atomic scale (nanometer) is the final step in miniaturization. In the laboratory nanofabrication techniques allow to carry out individual structures of a few atoms or molecules.

Beyond the reduction in size and the resulting increase in integration density,  new properties appears at  this scale, often of quantum origin, which can be used. Understanding the behavior of these "nano-objects", controlling their fabrication process or integration in devices and studying their properties are research topics carrying industrial issues for tomorrow.

The action of IRAMIS on the subject is facing a fundamental knowledge of the behavior of atomic or molecular systems and the search for new applications yet unimagined. An important activity of the IRAMIS concerns spin electronics (spintronics), with in particular the design and production of ultra-sensitive magnetic field sensors with multiple applications (non-destructive testing, security, speed sensors, sensors current ...).

 

Last update : 10/10 2018 (393)

 

Several IRAMIS teams are involved in calculations of the electronic structure (ab-initio , tight binding, Hückel methods, etc...) and more generally in the modeling of matter at the atomic scale, which also includes more phenomenological methods (empirical potentials, model Hamiltonians, etc...)

These modeling tools are mainly developed and used in physics (spectroscopy, transport, magnetism), chemistry (reactivity, dynamics) and for the study of materials (diffusion, growth, defects).

The "Theoretical spectroscopy" research group within LSI - Irradiated Solid Laboratory (Contact: Lucia Reining) is part of the heart of the ETSF structure (European Theoretical Spectroscopy Facility).

The topic "Electronic structure and atomistic modelisation" within the SPEC/GMT group (Contact: Cyrille Barreteau) gathers 4 research axis:

  • Structure ans dynamics
  • Quantum chemistry
  • Spectroscopy
  • Transport , magnetism and correlations

This research topic focuses on the development and study of:

  • magnetic materials or multiferroic oxides (ferroelectricity associated with magnetism)*
  • the magnetization dynamics in hybrid nanostructures and its coupling to the spin currents (spintronics)
  • development of ultra-sensitive magnetic sensor
  • and the associated modeling.

Such studies use many techniques mastered within IRAMIS: thin film growth (in particular oxides), magnetic transport measurements, (polarized) neutron scattering, ... The characterization of magnetic sensors is performed in a "ultra low magnetic noise laboratory" necessary to the development of multiple applications: non-destructive testing, security, speed sensors, current sensors ....

The "Nanomagnetism and Oxides Laboratory" (LNO) within SPEC has its activity fully focused on this topic.

 


Multiferroic materials are multifunctional materials having simultaneously several "ferroic" properties: ferromagnetism, ferroelectricity and / or ferro-elasticity. Their development in thin layers allows to design functional devices, where their coupled properties can be used.

Mastering light / matter interactions at scales smaller than the wavelength

Photonics is the science and technology of the production of photons, their propagation and their absorption by matter.

The photonic properties of condensed matter depends on the intrinsic properties of its constituents (molecules, crystalline lattice,...) but, as importantly, on their organization at the nanoscale. Thus, nanophotonics addresses the various processes of interactions of light with matter at scales smaller than the wavelength (the wavelength of visible light is between 400 and 700nm ) .

The nanophotonics laboratory focuses on molecular plasmonics, that is the various processes involving photonic interactions between conjugated molecules and metal nanostructures. The design and development of hybrid nano-objects with innovative photonic functions is undertaken by combining the following aspects of nanophotonics :

- Plasmonics (contact: Ludovic Douillard ) .

- Nonlinear Nanophotonics (contact: Celine Fiorini - Debuisschert ) .

- Self-assembled photonic objects (contact: Fabrice Charra ) .

The applications, addressed in various multidisciplinary collaborative projects, are in the areas of energy (photovoltaics, cold lighting), life sciences (optical molecular labels, sensors and actuators), information and communication technologies (integrated nanophotonics, data storage), as well as more forward-looking topics such as optical manipulation of nanosized objects or single-photon, single-electron, single-molecule photonics.

 

More:

 

With organic and molecular electronics, a data processing based on various types of nano-objects (molecules, biomolecules, nanoparticles, carbon nanotubes, graphene,...) is emerging.

This means developing:

  •  The synthesis of new molecules and new nano-objects
  •   Methods of chemical functionalization of nano-objects (graphene, NPs, nanotubes, C60) for the formation of hybrid materials with new or improved properties
  •   Assembly methods of nano-objects on surfaces
  •   Nanofabrication techniques to connect individual nano-objects
  •   Electronic transport measurements
  •   New operating strategies of the electronic properties for the implementation of new functions
  •   Theoretical efforts to model the studied devices and to propose new structures with original properties.

In the case illustrated here, one single molecule is connected to two electrodes spaced by 1 to 3 nm, the objectives are to master and understand the metal-molecule interface and the properties of the so positioned molecule. On this principle, single molecule LEDs have recently been studied: "Electroluminescence of a single polythiophene molecular wire suspended between the tip and the surface of a scanning tunneling microscope", © Guillaume Schull - IPCMS - CNRS / Université de Strasbourg.

 

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