SMP 2/4/12 | From Negative Refraction to Wireless Power Transfer: The Path of the Superlens | Speaker: Roberto Merlin
Saturday, February 4, 2012
170 & 182 Dennison Building
Speaker: Roberto Merlin (Peter A. Franken Collegiate Professor of Physics and Professor of Electrical Engineering and Computer Science, UM)Professor Merlin's talk takes us from the late 1800's, when Abbe published his ground-breaking paper on the limit of resolution of an optical instrument, to the turn of the 20th century, when the field of near-field optics experienced tremendous growth, emphasizing recent work on sub-wavelength focusing using negative-index slabs. In the second half of the talk, he introduces the concept of near-field plates. These are grating-like planar structures, which provide focusing well beyond the diffraction limit, at arbitrary frequencies. The subwavelength electromagnetic-field distributions of the plates closely resemble those of negative-index slabs. Practical implementations of these plates hold promise for near-field data storage, non-contact sensing, imaging, nanolithography and wireless power transfer applications. Experimental results on a microwave near-field plate will be presented, which demonstrate focusing of 1 GHz radiation at a resolution of LAMBDA/20.