English Nederlands

Educacie lecture George Palasantzas

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February 23, 2021 5:00 PM


The lecture will be about Casimir forces on actuation dynamics between real materials towards chaos.

Understanding the vacuum state of a system is a challenge of fundamental physics and associated important technologies. If confined within boundaries, quantum vacuum fluctuations manifest themselves by the generation of Casimir forces. However, boundaries between interacting bodies possess in many cases nanoscale surface roughness, which is both difficult to avoid and control. At short separations of less than 200 nm, nanoscale roughness starts to play an important role on the Casimir interaction between the bodies and their adhesion upon contact. Indeed, control of this short-distance interaction is crucial for MEMS/NEMS, and adhesion technologies. Although the Casimir forces for flat bodies can be described partly by Lifshitz theory that takes into account the actual measured optical properties of the interacting materials, for rough surfaces the problem is more complicated by the nonadditivity of the dispersion forces. In his talk, George will discuss the current state of the problem between real materials with attention to metals, phase change materials, and poor conductors with respect to actuation dynamics of devices towards chaotic behavior in terms of Melnikov and Poincare map analysis.

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