Service de Physique de l'Etat Condensé

Laboratory for Electronics and Photonics in Organics (LEPO)
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(homepage in French)

LEPO gathers the research activities of IRAMIS / SPEC in the physics of near-field Interactions.

Members of LEPO

 


 

 

Artist view of an energy transfer process at the nanoscale (POVRay).

Nanophotonics

Photonics is the science and technology of the production of photons, their propagation, their processing 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, a major part of nanophotonics, deals with sub-wavelength scale interactions of an electromagnetic wave with the conduction electrons of a metal / dielectric interface. (contact: Ludovic Douillard )

- Nonlinear Nanophotonics, deals with nonlinear optical properties of nano-objects. When a medium is subjected to a sufficiently intense light beam, the material response is no more linear giving rise to new processes such as multiphoton absorption or the generation of light at multiple frequencies of the incident one. (contact: Celine Fiorini - Debuisschert )

- Self-Assembled Photonic Objects on atomically-flat surfaces, and in particular on 2D materials, are at the origin of novel photonic properties, for applications ranging from environmental sensors to miniature lasers. (contact: Fabrice Charra )

- Optical Manipulation of Matter focusses on fundamental science and applied aspects of manipulating matter by light, at the nanoscale. Towards this challenging objective, new schemes for optical trapping and its detection are developped. (contact: Simon Vassant )

The applications, addressed in various multidisciplinary collaborative projects, are in the areas of energy (photovoltaics, cold lighting), life sciences (optical molecular labels, phototherapy, sensors, actuators), information and communication technologies (integrated nanophotonics, data storage).

 


 

 

Low force AFM (in blue) on murine Anti-Ovalbumine antibodies (IgG), using a quartz crystal tuning fork with a tip glued to one of its prongs (not the same scale). The morphology of the immobilizedl film (in blue) locally displays circular multimeric structures with 15nm radius resembling IgM antibodies structure.

Scanning Probe Techniques  (contact :   )

Atomic Force Microscopy (AFM) has become a widespread morphology investigation tool in surface sciences thanks to its remarkable versatility that allows studying various materials including dielectrics, liquid-solid interfaces and biologic objects in very diverse environments (atmosphere, gas, liquid, under vacuum). In the lab, we develop our own method based on quartz crystal tuning forks in custom 0PM-AFM (Zero Phase Modulation) mode to study in air and in liquid soft materials. Thanks to its high quality factor, the sensitivity of the probe remains sufficiently high to observe tridimensional alcane film structure at the liquid-solid interface with true atomic resolution, or to directly observe in air the molecular structure of functionalization films on biosensors developed in the lab.

Atomic Force Microscopy has become a widespread morphology investigation tool in surface sciences thanks to its remarkable versatility that allows studying various materials including dielectrics, liquid-solid interfaces and biologic objects in very diverse environments (atmosphere, gas, liquid, under vacuum).

In the lab, we develop our own method based on quartz crystal tuning forks in custom 0PM-AFM (Zero Phase Modulation) mode to study in air and in liquid soft materials. Thanks to its high quality factor, the sensitivity of the probe remains sufficiently high to observe tridimensional alcane film structure at the liquid-solid interface with true atomic resolution, or to directly observe in air the molecular structure of functionalization films on biosensors developed in the lab.

 

 


 

 

Tailored Interfaces and Tunable nano-Architectures engineered at Nanometer Scale (contact:   )

 

 


 

 

Maj : 21/11/2017 (2468)

 

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