EOS NEWS O


ptical scientist Alexandre Valentinovitsh Tishchenko lost his long battle with Cancer on 24 August 2016 at the age of 58.


Tishchenko’s talent was recognised early on in his career with the USSR Academy of Sciences prize – an award celebrating scientific work of young scientists – for his PhD research under the supervision of Nobel Prize winner Alexander Mikhaylovich Prokhoro, which focused on ‘Study of stripline and periodic structures for integrated optics’. At the beginning of the 80s, working in a research group led by V A Sychugov at the Institute of General Physics of the Russian Academy of Sciences, he made an exhaustive analysis of grating waveguide resonant phenomena by means of Rayleigh approximation, and revealed various properties such as resonant reflection. He also analysed the phenomenon of plasmon self-generation of ripples at metal and semiconductor surfaces, and found incidence conditions for writing spatially highly coherent surface undulations. Since the political shift of the early nineties, Tishchenko became involved in European and industrial projects, mainly aimed at the exploitation of resonant waveguide grating properties for biological, anti-counterfeiting and laser emission control applications, which resulted in a number of publications and patents. At the end of the 90s, he gradually joined


what was to become the Hubert Curien Laboratory of Jean-Monnet University, France, where, in 2000, he became a professor. There, he worked on two main objectives: the first being the development of a rigorous technique for modelling large scale structures of arbitrary refractive index distribution, with the aim of subverting the application domain, which was, up until that point, exclusively held by approximate scalar methods; these had a calculation time proportional to the number (N) of diffraction orders considered (instead


38 ELECTRO OPTICS l OCTOBER 2016


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In memoriam: Alexandre Valentinovitsh Tishchenko


Alexandre


Tishchenko was a very modest person with a great sense of humour


of the common N3) and absence of memory saturation. He also further developed the true-mode method and took part in co- ordinate transform techniques for metallic structures using his ‘Generalised Source Method’. The second objective was to


develop the phenomenological intelligibility of complex coupled systems. He did so by developing a general coupled wave formalism, which he applied, for instance, to explaining why – and how –


coupled plasmon systems can be made excess-loss free, as well as to explain the exact modelling of unusually large systems of strongly coupled metal nanoparticles that are non-spherical in shape.


As to the first application, Tishchenko needed a reference method, which he found in a Rayleigh hypothesis – confirmed by a numerical implementation – that provided a precise solution to grating convergence problems, thus extending its domain of stability.


Alexandre Tishchenko was a very modest


person with a great sense of humour. He was extremely kind to his partners and colleagues, and always available to question the physical relevance of hypotheses and to shed light on complex problems. The optical science community has lost a superior intelligence in full maturity of his highly-creative power. The undersigned acknowledge Alexandre Tishchenko’s scientific contributions and mourn his premature death. l


This obituary was contributed by: Professor T Benson, Nottingham University, UK; Professor J Chandezon, University of Clermont-Ferrand, France; Professor J Ctyroky, Czech Academy of Sciences; Dr A Erdmann, Fraunhofer IISB, Erlangen, Germany; Dr D Gallagher, Photon Design, UK; Professor G Granet, University of Clermont-Ferrand, France; Professor H.P


. Herzig,


EPFL, Switzerland; Dr. B. Kress, Microsoft Corp; Research Director Ph. Lalanne, Institut d’Optique, France; Professor. Lifeng Li, Tsinghua University, China; Dr N Lyndin, Institute of General Physics Moscow, MC Grating; Professor D Maystre, Fresnel Laboratory, France; Professor R Magnusson, University of Texas at Arlington, USA; Professor I Montrosset, Politecnico di Torino, Italy; Professor E Popov, Fresnel Laboratory, France; Research Director A Sentenac, Fresnel Laboratory, France; Dr Ing Th. Wriedt, Bremen University, Germany; Professor F Wyrowski, University of Jena, LightTrans, Germany.


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