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Manipulation d'atomes froids par champs optiques confinés : théorie et simulation numérique

Gaëtan Lévêque 
Abstract : This work concerns the interaction between neutral atoms and electromagnetic fields through dipolar interaction. The optical field is structured on a subwavelength scale, and is obtained by coupling a Fresnel evanescent wave with nanostructures deposited on a glass surface. The first part of this thesis presents a theoritical study of an atomic diffraction experiment using a nanostructured atomic mirror. The modulation of the potential arises from the interaction of the evanescent wave with a dielectric, subwavelength grating. At first, the main features of this method are explained through an analytical calculation based on several approximations about the optical-field structure and the internal atomic structure. The thesis is then completed with a numerical study which allows us to take into account all the complexity of this problem. The second part concerns the near-field structure of the light confined by a set of coupled resonant rings. These nanostructures, when excited near a resonance by an evanescent gaussian beam, increase the intensity and the gradient of the light by several hundred. The motivation is to find a configuration allowing the concentration or focusing of an atomic beam for applications in nanolithography. This study combines two methods. The first is a precise calculation of the optical field with an ab initio algorithm based on Green's dyadic functions, the second is a simple analytic model describing the modal behaviour of these stuctures with respect to their geometrical characteristics.
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Submitted on : Tuesday, May 25, 2004 - 4:20:19 PM
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  • HAL Id : tel-00006141, version 1


Gaëtan Lévêque. Manipulation d'atomes froids par champs optiques confinés : théorie et simulation numérique. Physique Atomique [physics.atom-ph]. Université Paul Sabatier - Toulouse III, 2003. Français. ⟨tel-00006141⟩



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