Prof. Nikolaos Tsitsas
School of Informatics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
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Academic Career Length
23Years (2004-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications19 March 2009 in Physical Review E
Journal Article
Nikolaos TsitsasNRN. Rompotis
N. Rompotis
IKIoannis Kourakis
Ioannis KourakisPKP. G. Kevrekidis
P. G. Kevrekidis
DFD. J. Frantzeskakis
D. J. Frantzeskakis
Starting from Maxwell’s equations, we use the reductive perturbation method to derive a second-order and a third-order nonlinear Schrödinger equation, describing ultrashort solitons in nonlinear left-handed metamaterials. We find necessary conditions and derive exact bright and dark soliton solutions of these equations for the electric and magnetic field envelopes.
15 March 2017 in Journal of the Optical Society of America B
Journal Article
Nikolaos Tsitsas
Constantinos ValagiannopoulosPlane wave scattering by a planar metasurface composed of two periodically alternating rectangular dielectric rods is considered. A rigorous integral equation methodology is employed for the analysis and the accurate determination of the reflected and transmitted fields. Systematic optimizations with respect to the configuration’s parameters are performed, which reveal that it is possible to obtain significantly enhanced anomalous reflection (with simultaneously suppressed ordinary reflection predicted by Snell’s law) with power varying from 92% to almost 100% of the input one, depending on the color of the incident light. It is shown that these reflection properties are supported by metasurfaces easily realizable with specific low-loss dielectric materials. In this way, several all-dielectric optimal designs are reported that can be used in numerous applications demanding anomalous reflection in the visible range.
13 July 2018 in IEEE Transactions on Antennas and Propagation
Journal Article
Nikolaos TsitsasGZGrigorios P. Zouros
Grigorios P. ZourosGFGeorge Fikioris
George FikiorisYLYehuda Leviatan
Yehuda LeviatanMethods employing auxiliary sources are applied to electromagnetic scattering problems by 2-D noncircular scatterers. Specific cases are considered for which the singularities of the analytic continuation of the scattered field into the interior of the scatterer can be analytically determined. Then, it is shown that the amplitudes (currents) of the sources diverge and oscillate when the auxiliary curve does not enclose these singularities. Still, the electric fields computed by means of the divergent and oscillatory currents are convergent and correct. The correctness of the computed fields is validated by comparison with the exact solutions (where possible) as well as with the numerical solutions computed via commercial field simulation software.
1 March 2010 in Physics Letters A
Journal Article
Nikolaos TsitsasTHT.P. Horikis
T.P. Horikis
YSY. Shen
Y. Shen
PKP.G. Kevrekidis
P.G. Kevrekidis
NWN. Whitaker
N. Whitaker
DFD.J. Frantzeskakis
D.J. Frantzeskakis
26 April 2012 in Radio Science
Journal Article
Constantinos ValagiannopoulosNikolaos Tsitsas11 April 2006 in Electrical Engineering
Journal Article
Nikolaos TsitsasEAE. G. Alivizatos
E. G. Alivizatos
DKD. I. Kaklamani
D. I. Kaklamani
HAH. T. Anastassiu
H. T. Anastassiu
About Me
Nikolaos L. Tsitsas was born in Athens, Greece in 1979. He received his Diploma and Ph.D. degrees in electrical engineering from the National Technical University of Athens (NTUA), Athens, Greece, in 2002 and 2006, respectively, and his M.Sc. degree in applied mathematics from the National and Kapodistrian University of Athens, Athens, in 2005.
From 2008 to 2011, he was an Adjunct Lecturer with the School of Applied Mathematical and Physical
Sciences, NTUA. From 2009 to 2011, he was an Adjunct Lecturer with the Hellenic Army Academy, Vari, Greece. Since 2012, he has been with the School of Informatics, Aristotle University of Thessaloniki, Thessaloniki, Greece, where he is currently an Associate Professor. He is the author or coauthor of 80 articles in scientific journals and over 80 articles in conference proceedings. His research is focused on methodologies of applied mathematics in direct and inverse wave scattering
and propagation theory.
Dr. Tsitsas is a member of the American Mathematical Society and the Technical Chamber of Greece, a Senior Member of the Optical Society of America and the IEEE and an individual member of the Union Radio-Scientifique Internationale.