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Date:         Fri, 5 Dec 2008 15:59:33 +0200
Reply-To:     Joe van Zwaren <[log in to unmask]>
Sender:       Optics Newsletter <[log in to unmask]>
From:         Joe van Zwaren <[log in to unmask]>
Subject:      OPTICS-L: TAU EE Seminar by Prof. Igor Tsukerman, December 18,
              2008 at 14:00, Room 206, Wolfson Mech. Eng. Bldg.,
              Tel-Aviv Univ., (parking facing gate 14)
Content-Type: multipart/mixed;


From: Esther Zilka <[log in to unmask]> Shalom, Please find attached a seminar from the Dept. of Physical Electronics for your information and distribution (if relevant). Thank you, Esther*.* *The seminar will take place on Thursday December 18,* *at 14:00, Room 206 at the Faculty of Engineering, Wolfson Mechanical Eng. Bldg., Tel Aviv University*** ** * * * * Seminar * * * * * * *Novel Approaches in the Simulation and Analysis* * of Electromagnetic and Photonic Structures* *Prof. Igor Tsukerman* Department of Electrical and Computer Engineering, The University of Akron, OH The talk covers selected research topics lying in the intersection of theory, computational methods, and applications in electromagnetics and photonics. 1. *Theory*. Negative refraction (electromagnetic waves bending the "wrong" way at material interfaces) and the closely related phenomenon of backward waves (phase velocity at an obtuse angle with group velocity) have become one of the most fascinating areas of research in nanophotonics this century. In the presentation, the mechanism of negative refraction and backward waves is examined. Explicit lower bounds for the cell size of metamaterials and photonic crystals capable of supporting backward waves are established and numerical examples are given. 2. *Computational methods*. The generalized finite-difference calculus of Flexible Local Approximation MEthods (FLAME) is reviewed and various examples are presented. FLAME often dramatically improves the accuracy by incorporating local analytical approximations of the solution into the difference scheme. For instance, in the computation of Bloch bands FLAME can produce 6−8 digits in the (generally complex) Bloch wavenumber on Cartesian grids of very modest size. 3. *Applications *include* *Bloch mode analysis in periodic structures with or without frequency dispersion, plasmonic field enhancement in optical "nanolenses" and in near-field microscopy. A new application is subwavelength "superfocusing" by plasmonic/dielectric nanolayers; the focus can in principle be arbitrarily sharp. I gratefully acknowledge the contribution of František Čajko and Jianhua Dai, as well as collaborative research with the groups of A.P. Sokolov (Polymer Science, The University of Akron), M. Stockman (Physics, Georgia State University), F. Keilmann (Max-Planck-Institut für Biochemie, Germany), and J. P. Webb (Electrical & Computer Engineering, McGill).

S_Tsukerman_Igor08.doc [application/msword]

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