Time: 3:30pm - 12:00am
The Antennas Group is very pleased to announce the following Guest Speaker Seminar: “Emerging Light-Matter Interactions: super (anti) imaging, ghosting, and optical micromanipulation”
Date, Place and time: Wednesday 17th July 2013, Eng 2.07 at 3.30 pm
Presenter: Dr Cheng-Wei Qiu, Assistant Professor, Department of Electrical and Computer Engineering, Faculty of Engineering, National University of Singapore, Singapore
The light-matter interaction can be manipulated to obtain a plethora of unprecedented optical phenomena. In this talk, we will present our recent developments on emerging light-matter interactions, in particular, the super-resolution and super-anti-resolution imaging in farfield exploiting super-oscillation and diffraction theorem as well as novel optical micromanipulation exploiting redirection of photon momentum. The physics of super-oscillation in the context of farfield super-resolution imaging will be unveiled and various experiments have been proposed to access the implications of such techniques in the practical applications. Vector Rayleigh-Sommerfeld method is introduced and developed to design ultrathin flat surface for super imaging, while enabling the polarization control of the focal region. On the other hand, Ijon’s lamp based on super-anti-resolution is also experimented. Furthermore, the light will exert optical force toward the object being illuminated. Manipulating light-matter interaction empowers new possibilities of achieving optical pulling force or tractor beam. We will present our recent results on how to make a Bessel beam or even a Gaussian beam to be tractor beam, with experimental verifications. Universal pulling effects and conditions are discussed in association with insight on modified far-field scattering, scattering resonances, and induced dipoles.
Biography: Dr. C.W. Qiu received his Ph. D. degree (from Joint Singapore-France PhD Program of NUS-SUPELEC) in 2007. He was a Postdoctoral Fellow at Physics Department in MIT till the end of 2009, and in December 2009, he joined National University of Singapore as an Assistant Professor. He was the recipient of the SUMMA Graduate Fellowship in Advanced Electromagnetics in 2005, IEEE AP-S Graduate Research Award in 2006, Young Scientist Travel Grant of ISAP in 2007, URSI Young Scientist Award in 2008, and NUS Young Investigator Award in 2011, and MIT Technology Review Award TR35 (Asia) in 2012. His research interests are in the areas of electromagnetics, transformation/diffractive optics, and nanophotonics. He has published over 70 journal papers and two book chapters, with the press coverage by ScienceNow, SPIE Newsroom, Daily Mail, Le Monde, MIT Technology Review, Nanowerk, Wired, Straits Times, New Journal of Physics “Highlights of 2012”, and some others. He has been serving as Associate Editor for the Advanced Electromagnetics Journal.