Stages niveau Master
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Master's level internship in Villetaneuse (93) - Laboratoire de Physique des Lasers
- Le 18/10/2023
- Dans Stages niveau Master
Internship: Probing atoms or molecules at nanometric distances away from a surface by precision spectroscopy
Description: Dispersive forces between neutral but polarisable objects are essential for the cohesion of matter and play a vital role in our understanding of the electromagnetic properties of matter. A paradigm of such forces is the Casimir force between two parallel plates, representing a mactroscopic manifestation of quantum fluctuations. Closely related to the Casimir effect are Casimir-Polder interactions between a dielectric surface and a quantum object (atom or a molecule) that shift atomic and molecular energy levels at nanometric distances away from a surface (typically from a few nanometers to a few microns). Atom-surface interactions have been mainly investigated with ground state alkali atoms focusing on the distance dependence of the atom-surface interaction potential [C. I. Sukenik et al. Phys Rev. Lett. 70, 560, (1993)]. The SAI (Spectroscopie Atomique aux Interfaces) group of the LPL has developped selective reflection and nanocell spectroscopy as two major methods for probing Casimir-Polder interactions with excited state atoms. Using these techniques, we have pioneered atom-surface interaction studies focusing in particular on the influence of thermally excited surface polaritons [J. C de Aquino Carvalho et al., Phys. Rev. Lett. 131, 143801, (2023)]. At the moment the group is offering a Masters internship in one of the following new experiments. Read more
Work location:
Laboratoire de Physique des Lasers
Université Sorbonne Paris Nord - CNRS
99 Avenue Jean-Baptiste Clément
93430 Villetaneuse
FranceApplication procedure (CV, motivation letter): Isabelle Maurin (isabelle.maurin@univ-paris13.fr)
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Master's level internship in Talence (33) - Laboratoire Photonique Numérique et Nanosciences
- Le 21/09/2023
- Dans Stages niveau Master
Internship: Nonlinear optical microscopy to visualize the architecture of connective tissues
Description: The mechanical properties of biological systems play a complex role in determining the physiological functions of tissues and appear to be dominant factors in many processes of development, homeostasis and pathology. Interestingly, tissues with properties as different as bone, skin or tendon are mainly composed of the same elementary units. Hence, their specific mechanical properties are directly linked to their sub-microscopic organisation. Nowadays, understanding the structure/function link in connective tissues faces the challenge of probing the multiple scales involved in constructing macroscopic properties from individual structures in highly complex samples. Indeed, standard techniques remains either invasive, limited to the surface, or not sufficiently resolving. The advent of multiphoton microscopy, based on the nonlinear interaction between laser pulses and the constituents of biological samples, has revolutionised the way we observe living organisms. Notably, Second Harmonic Generation (SHG) microscopy has recently emerged as the gold standard for collagen imaging in thick samples, enabling label-free visualization of fibrillar distribution with high intrinsic specificity and sub-micron resolution. Read more
Work location:
Laboratoire Photonique Numérique et Nanosciences (UMR5298)
Institut d'Optique d'Aquitaine
rue François Mitterand
33400 Talence
FranceApplication procedure (CV, motivation letter, transcripts and reference letter): Stéphane Bancelin (stephane.bancelin@cnrs.fr)