TOPIC Scattering Asymmetry and Non-conservative Optical Forces 
AREA Microwave & RF 
SPEAKER Professor Juan José Sáenz , Donostia International Physics Center (DIPC), San Sebastian, Spain & Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Madrid, Spain 
DATE 28 April 2014, Monday 
TIME 10:00 am to 12:00 pm 
VENUE E2-03-02, Engineering Block E2, Faculty of Engineering, NUS 
FEES No Charge 

SYNOPSIS
The idea of using optical beams to attract objects has long been a dream of scientists and the public alike. Here we review the most recent progress in this emerging field, including new concepts for manipulating small objects using optically induced ‘negative forces’, achieved by tailoring the properties of the electromagnetic field, the environment or the particles themselves. We will address some basic questions related to the light forces on small particles, which are usually described as the sum of two terms: the dipolar or gradient force and the scattering or radiation pressure force. These forces are, in general, non-conservative (curl forces) which lead to a number of intriguing predictions regarding the dynamics of nanoparticles. We will also discuss the interplay between scattering asymmetry and optical forces and, in particular, we will focus on the outstanding scattering angular distributions, with zero forward- or backward-scattered intensity, (i.e., the so-called Kerker’s conditions) recently observed for subwavelength dielectric particles both in the microwave and visible spectral regimes.  

ABOUT THE SPEAKER
Juan José Sáenz is Professor at the Condensed Matter Department of the Universidad Autónoma de Madrid (UAM). Since 1993 he runs the Moving Light and Electrons (MoLE) group at UAM. He joined the UAM as Assistant Professor in 1982 where he worked on the stability and equilibrium properties of small clusters and crystals in Prof. N. García’s group. He was also involved in the first works on magnetic force microscopy (MFM) in collaboration with Prof. Güntherodt’s group in Basel. In 1987 he obtained his PhD from UAM.

During his post-doc, he worked on electron field emission from nanotips in Dr. H. Rohrer’s group at IBM-Zürich. From 1989 to 2006 he was Associate Professor at UAM. Since 2007 he is Full Professor at UAM. At present his research interests include theoretical work on Nano-Optics, optical forces, modelling of scanning probe microscopies (SPM), quantum electron transport through nanocontacts and wave transport and molecular imaging through complex media. In 2003 he was Invited Professor in the EM2C-(CNRS) Lab. at École Centrale Paris working on nano-optics. He has published over 150 papers (among them 27 in Physical Review Letters). He is co-organizer of the “Trends in Nanotechnology” (TNT) international conference series. He is member of the Optical Society of America. During 2013-2014 he was awarded with an Ikerbasque Visiting Professor at the Donostia International Physics Center (DIPC).
 

REMARKS, IF ANY
Jointly organized by IEEE Photonics Chapter and Department of Electrical & Computer Engineering, NUS 

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All are welcome to attend these Seminars. Should you have any enquiries, please contact Ms. Lily Png at 6516 6509 or you can e-mail to Ms Lily Png ().