Joint Seminar - Department of Electronic and Computer Engineering, IEEE Photonics Society (Hong Kong Chapter)
Metal-Free Flat Lens Using Negative Refraction by Nonlinear Four-wave Mixing

by Prof. Wenjie Wan, Dept. of Physics, Shanghai Jiao Tong University, China and University of Michigan-SJTU Joint Institute, China

 :  11 Aug 2014 (Mon)
 :  11:00am - 12:30 pm
Venue  :  Rm 3598, 3/F (Lift 27, 28), Academic Complex, HKUST


A flat lens utilizing negative refraction contrasts sharply with traditional lenses for its unique ability to focus light at the nanoscale. Here we demonstrate a new type of flat lens by negative refraction using the degenerate four wave mixing (4WM) process. We realize direct nonlinear image (of different color) of the original target behind a thin lens. By using this effect, we further realize imaging in non-collinear and collinear configuration. Our methods show that a planar nonlinear medium can act as a flat lens, which is desired in imaging systems and may find further applications in super resolution imaging.

Wenjie Wan received the B.E. from the Hong Kong University of Science and Technology in 2004 and Ph.D from at Princeton University in 2010, both in Electrical Engineering. After one year postdoctoral training at Yale University, he joint UM-SJTU Joint Institute as Assistant Professor and jointly appointed by Department of Physics, SJTU. Dr. Wan’s publications include Science, Nature Physics, Nature Photonics and Physical Review Letters. In 2011, he is awarded “1000 people’s plan (youth)” by Chinese Government.