# 信息来源：暂无 发布日期: 2017-09-08浏览次数:

**报告题目：****Stable Casimir Equilibria**

**报 告 人：**赵荣阔博士 (博士后，美国加州大学)

**时 间：**2017年9月11日上午9:30

**地 点**：安徽大学磬苑校区理工楼B303

**主办单位：**电子信息工程学院

欢迎各位老师、同学届时前往！

科学技术处

2017年9月8日

**报告简介: **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 this 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.

**报告人简介：**

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.

**SELECTIVE PUBLICATIONS ****【***First author + contributed equally: 14; Total citations: 1541; H-index: 18 (by Google Scholar 4/2/17)***】**

1. R. Zhao, Yu Luo, A. I. Fernández-Domínguez, and J. B. Pendry, “Description of van der Waals interactions using transformation optics,”** Phys. Rev. Lett**. 111, 033602 (2013).

2. R. Zhao, A. Manjavacas, F. Javier Garcia de Abajo, and J. B. Pendry, “Rotational quantum friction,”** Phys. Rev. Lett**. 109, 123604 (2012).

3. R. Zhao, J. Zhou, Th. Koschny E. N. Economou and C. M. Soukoulis, “Repulsive Casimir force in chiral metamaterials,” **Phys. Rev. Lett**. 103, 103602 (2009).

4. Y. Luo*, R. Zhao*, and J. B. Pendry, “van der Waals interactions at the nanoscale: The effects of nonlocality,” **PNAS** 111, 18422-18427 (2014).

5. J. B. Pendry, A. I. Fernández-Domínguez, Yu Luo, and R. Zhao, “Capturing photons with transformation optics,” **Nature Physics **9, 518-522 (2013). (Contributions: All authors are deemed to have contributed equally.)

6. N. Bachelard, C. Ropp, M. Dubois, R. Zhao, Y. Wang, and X. Zhang, “Emergence of an enslaved bandgap in a non-equilibrium pseudo-crystal,” Accepted by** Nature Materials **(2017).

7. J. B. Pendry, Y. Luo, and R. Zhao, “Transforming the optical landscape,”** Science **348, 521-524 (2015).

8.P. Tassin, L. Zhang, R. Zhao, A. Jain, Th. Koschny, and C. M. Soukoulis,

“Electromagnetically induced transparency and absorption in metamaterials: The radiating two-oscillator model and its experimental confirmation,”** Phys. Rev. Lett**. 109, 187401 (2012).