Prof., ECE Department,
UNC Charlotte, NC,USA
Title:ISM: Integrated-Superlattice-Met material
Artificially produced dielectric materials introduced by L. Lewin in England appeared in 1945,
 leading the development of periodic loading of waveguides, [2, 3] with wide spread applications in microwave antennas
developed in late 1950's. However this sort of artificially produced media for light did not live up to its expectations because,
being passive, operating near resonance to gain efficiency, leading to breakdowns under higher power applications such as high
power antenna systems as well as solar concentrators. On the other hand, semiconductor- superlattices,  being active systems,
are designed for operating as oscillators and lasers as in the QCL,  quantum cascade lasers, and THz
amplifiers, using MQW, multiple quantum wells as well as superlattices leading the way to photonic crystals and ultimately to future
metamaterials with active components. By combining the principles of SL, superlattices and MM, metamaterials: with SL including man-made circuit elements, and MM with semiconductor MQW, a new kind of system, ISM, for Integrated-Superlattice-Metamaterial, having the best of both SL and MM. The key is to include generalized SL such as QCL involving optimization with MQW, multiple quantum well, instead of strict periodic systems, with the generalization of MM using semiconducting components to allow longer mean-free-path of electrons in interactions with photons. The proposed scheme represents the logical extension of the
two systems: SL and MWQ on the one hand and metamaterials with clever man-made circuit elements on the other.
Professor Raphael Tsu (with Tsu replaced by Zhu in pinyin) is a world leader in the areas of quantum properties of materials and device physics. An acknowledged authority in these subjects Professor Tsu has published two hundred scholarly papers in scientific journals; an author of a monograph on quantum wells and superlattice materials and devices of which he is a co-inventor, holder of several patents for his discoveries and inventions.
The description of his research contributions while at the IBM, T.J. Watson Research Center in Yorktown Heights was presented to the White House by the US Army Research Office, The Superlattice Story, played an important role in the 90's towards the US National Nanoscience Initiative (NNI).
Dr. Tsu is a Distinguished Professor of electrical engineering as well as Optical Science and Engineering at the University of North Carolina at Charlotte. He is a fellow of the American Physical Society and ex-member of International Advisory Board of the Microelectronic Journal, Elsevier; winner of: Outstanding Contribution Award -IBM 1975; Alexander von Humboldt Award - 1975; Co-winner Am. Phys. Soc. International New Materials Prize - 1985
Dr. Raphael Tsu, provided the basic theory of negative differential conductance applicable to the man-made Superlattice introduced by L. Esaki and R. Tsu 40 years ago. Two years later, he obtained the tunneling through the double barrier structure, the basic unit of the superlattice structure.
These results formed the for-runner of today's nanoelectronics.