报告题目：Stable Casimir Equilibria
To obtain more capabilities, devices are becoming smaller and smaller. Because nanostructures are sensitive to undesirable forces, managing force represents the biggest challenge in nanoscale mechanics. Quantum fluctuation induced electromagnetic fields result in attractive forces between closely spaced electrically neutral surfaces, called Casimir force.
Between two surfaces of the same material, Casimir force is intrinsically always monotonically attractive, which results in disaster of unavoidable adhesion and friction in micro-/nano- machines. In my talk, I will focus on my recent theoretical and experimental demonstration of stable Casimir equilibia, where the Casimir force between two surfaces is repulsive at distances smaller than several tens of nanometers and attractive at large distances, so that the components in nanomachines can remain noncontact and stably trapped at a controllable distance.
Rongkuo Zhao is a postdoctoral scholar in the Nanoscale Science and Engineering Center and Department of Mechanical Engineering at University of California, Berkeley. Prior to his current position, he was a Royal Commission for the Exhibition of 1851 Research Fellow in Department of Physics at Imperial College London in the UK. He completed his BS degree in Applied Physics in 2007 at Xi’an Jiaotong University, China. He received his Ph.D. degree in Optics from Beijing Normal University in 2011, in a joint program with Iowa State University. His research interests are in quantum and thermal ﬂuctuation-induced electromagnetic interactions including van der Waals and Casimir forces, noncontact quantum friction, and radiative heat transfer, and also in understanding the interaction of light with artificial nanostructures such as metamaterials, plasmonics, and photonic crystals.