Repulsive Casimir Forces

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Davoodabadi, Khosro | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 48231 (04)
University: Sharif University of Technology
Department: Physics
Advisor(s): Bahmanabadi, Mahmoud; Taghizadeh Firouzjaee, Javad
Abstract:
It is well known that the fluctuations of electromagnetic fields in vacuum or in material media depend on the boundary conditions imposed on the fields. This dependence gives rise to forces which are known as Casimir forces, acting on the boundaries. Casimir forces between similar and disjoint objects such as two conducting or dielectric bodies are known in most cases to be attractive.¬¬ These forces are sometimes viewed as the macroscopic consequence of Van der Waals and Casimir-Polder attraction between molecules. In this thesis at first, calculation of Casimir forces in simple models were demonstrated. Then Van der Waals and Casimir-Polder forces have been explained in a unified theory called lifshitz. It is found that with choosing suitable materials with special electromagnetic properties, these forces could be repulsive and this repulsion have been confirmed in some experiments as were reported. It was discussed that the Phenomenon of repulsive Casimir forces are important for both experimental study and nanomachinery applications
Keywords:
Quantum Field Theory ; Casimir Force ; Van Der Waals Model ; Dielectric Properties ; Lifshitz Theory

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