Sergei Tretyakov (scientist)

Sergei Tretyakov (Russian: Серге́й Анато́льевич Третьяко́в, IPA: [sʲɪrˈɡʲej ɐnɐˈtolʲjɪvʲɪtɕ trʲetʲæˈkof] (listen)) (born in 1956) is a Russian-Finnish scientist, focused in electromagnetic field theory, complex media electromagnetics and microwave engineering. He is currently a professor at Department of Electronics and Nanoengineering, Aalto University (former Helsinki University of Technology), Finland.[1][2][3] His main research area in recent years is metamaterials and metasurfaces from fundamentals to applications. He was the president of the European Virtual Institute for Artificial Electromagnetic Materials and Metamaterials (”Metamorphose VI”) and general chair of the Metamaterials Congresses from 2007 to 2013. He is a fellow/member of many scientific associations such as IEEE, URSI, the Electromagnetics Academy, and OSA. He is also an Honorary Doctor of Francisk Skorina Gomel State University.[4]

Sergei Tretyakov
Born1956
Leningrad, Soviet Union
NationalityRussian, Finnish
Alma mater
Known for
metamaterials, bianisotropic media
AwardsHonorary Doctor of Francisk Skorina Gomel State University
Scientific career
FieldsElectrical engineering,Physics
Institutions
Doctoral advisorM. I. Kontorovich
Other academic advisorsV. A. Rozov
Websiteusers.aalto.fi/~sergei/, meta.aalto.fi
Photo of an experimental broadband electromagnetic cloak produced in the group of Sergei Tretyakov. The inner metallic cylinder is cloaked by outer metal plates.

Education

Sergei Tretyakov has received the Engineer's degree and the Candidate of Sciences (PhD) degree in radiophysics from the Leningrad Polytechnic Institute, USSR in 1980 and 1987, respectively. In 1994 he was granted a Docent Diploma by the Ministry of Education of Russian Federation and in the following year he received Doctor of Sciences degree from St. Petersburg State Technical University, Russia. Tretyakov obtained his Full Professor Diploma in 1997 granted by the Ministry of Education, Russia.

Career

Professional career of Sergei Tretyakov started in 1980 at Radiophysics Department of Leningrad Polytechnic Institute, where he had been an engineer and junior researcher until 1986. In 1986 he was promoted to the position of assistant professor and in 1989 to the position of associate professor. In October 1988, Tretyakov had a 10-months-long research visit to Helsinki University of Technology (from 2010, Aalto University) according to the exchange program between the Ministries of Education in Finland and Soviet Union.[5] During following 8 years, Tretyakov was affiliated with both Electromagnetics Laboratory of Helsinki University of Technology where he worked with Ismo Lindell and Ari Sihvola and St. Petersburg State Technical University where he worked with Constantin Simovski. Tretyakov visited CEA Cesta (French Alternative Energies and Atomic Energy Commission research centre), also affiliated with the Laboratory of Wave-Material Interactions in University of Bordeaux, for 6 months in 1994 as a visiting scientist. In 1996, he was promoted to full professor position in St. Petersburg State Technical University, where he also became a director of Complex Media Electromagnetics Laboratory. From January 1999 until July 2000 Tretyakov was a visiting professor in Electromagnetics Laboratory of Helsinki University of Technology and in August 2000, he moved to the Helsinki University of Technology as a full professor of Radio Engineering. Later on, as a visiting professor, he visited the Abbe Center of Photonics in Friedrich Schiller University Jena, Germany during June – July 2013, and the Department of Photonics Engineering in Technical University of Denmark during January - April 2013. He educated 13 doctors of science.

Research

Tretyakov has authored or co-authored more than 280 papers in refereed journals, 5 books, and 17 book chapters.[2][6] Tretyakov's research career started with his diploma thesis under supervision of Prof. V.A. Rozov.[5] The thesis was devoted to the problem of diffraction at an edge of dense planar arrays of metal wires,[7][8] what is now referred as metasurfaces or two-dimensional metamaterials. During the doctoral studies, Tretyakov worked on ferrite-based anisotropic layered structures under supervision of Prof. M.I. Kontorovich.[9] The first research visit to Helsinki University of Technology profoundly influenced his research interest, shifting it towards a novel and very promising direction of complex electromagnetic materials (now called metamaterials). From this time forth Tretyakov actively works in this research direction with the main contributions listed below.

Electromagnetics of chiral and general bianisotropic media

Tretyakov made important contributions to research of bianisotropic media.[10][11] Together with co-authors, he developed the general theory of electromagnetic waves interactions with bianisotropic materials and layers. Moreover, Tretyakov proposed and experimentally characterized first non-reciprocal bianisotropic scatterers of two types: so-called Tellegen scatterer[12] (named after Bernard D. H. Tellegen who suggested gyrator as a circuit element with equivalent electromagnetic response) and artificial "moving" scatterer[13] (a composite based on such scatterers emulate response of a truly moving medium). In 1997, Tretyakov and his colleagues demonstrated that chiral effects (optical rotation and circular dichroism) can be achieved even with an infinitely thin composite layer without broken mirror symmetry.[14] This effect was subsequently named as planar chirality and independently discovered by the team of Nikolay I. Zheludev in 2003.[15]

Chiral nihility and negative refractive index

Possibility of existence of a backward wave medium, where electromagnetic waves propagate with anti-parallel phase and group velocities, was suggested by several scientists throughout the twentieth century: Arthur Schuster,[16][17] Horace Lamb,[18] Leonid Mandelstam,[19] Victor Veselago,[20] and others. However, due to the absence of materials with such properties in nature, wide interest to the backward wave media was generated only in the early 2000s, when the team of David R. Smith experimentally demonstrated first negative-index metamaterial.[21] In 2003, Tretyakov and colleagues suggested an alternative way to achieve backward waves by using bianisotropic chiral materials.[22][23] In this case, it is not required to engineer negative permittivity and permeability, instead, one should just ensure proper chiral response of the material. In the extreme case of so-called chiral nihility (when both relative permittivity and permeability are much smaller than the chirality parameter), two eigenwaves represent "forward" and "backward" circularly polarized waves with equal phase velocities. The existence of backward waves in chiral media was independently suggested by John Pendry in 2004.[24]

Broadband cloaking of cylindrical objects

Inspired by the idea of transformation-optics based electromagnetic cloaking, Tretyakov's team developed an alternative realization of the same effect for cylindrical objects.[25] In contrast to the previous designs, Tretyakov's cloaking device exhibits significantly increased bandwidth and lower amount of dissipation loss.[26] Moreover, it does not require the use of exotic metamaterials with gradient permittivity and permeability, but, instead, is based on conducting plates with a simple geometry.

Strong spatial dispersion in wire media

In 2003, Tretyakov's group demonstrated that a dense array of metal wires (wire medium), generally, exhibits strong nonlocal response (spatial dispersion), i.e. cannot be described by usual material parameters such as permittivity.[27] The property of strong spatial dispersion enables the use of wire media for subwavelength imaging and transmission of images over long distances.[28]

Superlensing

The concept of the superlens, introduced by John Pendry in 2000 as an extension of the work done by Victor Veselago, showed a theoretical possibility to achieve optical resolution well below the wavelength. In 2003, Stanislav Maslovski and Sergei Tretyakov showed that an alternative to Pendry’s device can be constructed using layers that impose the necessary boundary conditions at two parallel planes in free space.[29] Later in 2004, Tretyakov with co-authors explored the necessary electromagnetic properties of the layers and confirmed the effect with experiments.[30]

Constitutive parameters of metamaterials

By definition, metamaterials are realized as lattices whose periodicity is assumed to be much smaller than the wavelength. However, it is important that, though small, the periodicity is not negligible with respect to the wavelength. For this reason, if one formally introduces constitutive parameters for such regime, they will not be measurable response functions, and it will not be possible to use them for a sample of other dimensions or for a sample excited in another way. In other words, such formally introduced material parameters cannot satisfy the conditions of locality. In 2007, Tretyakov and colleagues explained the physical meaning of calculated material parameters, different from the meaning of the local constitutive parameters[31]

High-impedance surfaces and metasurfaces

High Impedance Surfaces (HIS), also known as Artificial Magnetic Conductors (AMC), are artificial structures designed by applying special textures to a conducting surface. In a narrow band of frequencies, these structures have very high impendences which can be used as ground planes for novel low profile antennas and other electromagnetic structures. In 2008, Tretyakov and colleagues developed analytical formulas for the calculation of the grid impedance of electrically dense arrays of strips and square patches and their applications for HIS.[32] Tretyakov also made an important contribution to clarify the role of spatial dispersion in the mushroom structure in 2009. This work demonstrated that, under some conditions, spatial dispersion is suppressed.[33] More recently, he worked on modelling and applications of thin composite layers with engineered electromagnetic properties (metasurfaces), in particular, developing approaches to full control of reflected and transmitted waves.

Awards and recognition
"Electromagnetics of bi-anisotropic materials: Theory and applications".[11]

Important monographs
  • "Analytical Modeling in Applied Electromagnetics"[37]
  • "Electromagnetics of bi-anisotropic materials: Theory and applications"[11]
  • "Modern Electromagnetic Scattering Theory with Applications" [38]
  • "Electromagnetic waves in chiral and bi-isotropic media" [10]
gollark: Shadow Walkers, Omens, mostly.
gollark: Unfortunately the ones with the alts I like mostly either aren't or I don't know who they are.
gollark: Heretic!
gollark: Except cyan which is a traitor.
gollark: Hopefully one day it will be possible to conveniently 3D-print cool xenowyrm accessories.

References
  1. "Aalto People". people.aalto.fi. Retrieved 2018-04-04.
  2. "Home page of Prof. Sergei Tretyakov, Department of Radio Science and Engineering, Aalto University". users.aalto.fi. Retrieved 2018-03-11.
  3. "Theoretical and Applied Electromagnetics of Complex Media". meta.aalto.fi. Retrieved 2018-04-04.
  4. "List of Honourable Doctors of Francisk Skorina Gomel State University" (PDF).
  5. Tretyakov, Sergei (Summer 2017). "Complex-media electromagnetics and metamaterials". Journal of Optics. 19 (8): 084006. doi:10.1088/2040-8986/aa7956.
  6. "Plenary speakers". congress2015.metamorphose-vi.org. Retrieved 2018-03-11.
  7. Rozov, V.A.; Tretyakov, S.A. (1981). "Diffraction of plane electromagnetic waves by a semi-infinite grid of parallel conductors". Radioengineering and Electronic Physics. 26: 6–15.
  8. Rozov, V.A.; Tretyakov, S.A. (1984). "Diffraction of plane electromagnetic waves by a semi-infinite grid made of parallel conductors arranged at an angle to the grid's edge". Radioengineering and Electronic Physics. 29: 37–47.
  9. Kontorovich, M.I.; Tretyakov, S.A. (1987). "New approach to the solution of magnetostatic problems for anisotropic layered structures". Zhurnal Tekhnicheskoi Fiziki. 57: 1429–1431.
  10. Lindell, Ismo V.; Sihvola, Ari H.; Tretyakov, Sergei A.; Viitanen, A.J. (1994). Electromagnetic Waves in Chiral and Bi-Isotropic Media. Boston: Artech House. p. 332. ISBN 9780890066843.
  11. Serdyukov, A.; Semchenko, I.; Tretyakov, S.; Sihvola, A. (2001). Electromagnetics of bi-anisotropic materials : Theory and applications. Amsterdam: Gordon and Breach Science. p. 337. ISBN 978-9056993276. OCLC 870578996.
  12. Tretyakov, S.A. (2003). "Artificial Tellegen Particle". Electromagnetics. 23 (8): 665–680. doi:10.1080/02726340390244789.
  13. Tretyakov, S.A. (1998). "Nonreciprocal composite with the material relations of the transparent absorbing boundary". Microwave and Optical Technology Letters. 19 (5): 365–368. doi:10.1002/(SICI)1098-2760(19981205)19:5<365::AID-MOP16>3.0.CO;2-#.
  14. Sochava, A. A.; Simovski, C. R.; Tretyakov, S. A. (1997). Advances in Complex Electromagnetic Materials. NATO ASI Series. Springer, Dordrecht. pp. 85–102. doi:10.1007/978-94-011-5734-6_7. ISBN 9789401064187.
  15. Papakostas, A.; Potts, A.; Bagnall, D. M.; Prosvirnin, S. L.; Coles, H. J.; Zheludev, N. I. (2003-03-14). "Optical Manifestations of Planar Chirality" (PDF). Physical Review Letters. 90 (10): 107404. Bibcode:2003PhRvL..90j7404P. doi:10.1103/PhysRevLett.90.107404. PMID 12689032.
  16. Schuster, A. (1904). An introduction to the theory of optics. London: Edward Arnold.
  17. Boardman, A.D.; King, N.; Velasco, L. (2006). "Negative Refraction in Perspective". Electromagnetics. 25 (5): 365–389. arXiv:cond-mat/0508501. doi:10.1080/02726340590957371.
  18. Shalaev, Vladimir M. "Lecture "Optical Metamaterials"" (PDF).
  19. Mandel’shtam, L.I. (1945). "Group velocity in a crystal lattice" (PDF). Journal of Experimental and Theoretical Physics. 15: 18.
  20. Veselago, Viktor G (1968). "The electrodynamics of substances with simultaneously negative values of ε and μ". Soviet Physics Uspekhi. 10 (4): 509–514. Bibcode:1968SvPhU..10..509V. doi:10.1070/pu1968v010n04abeh003699.
  21. Shelby, R. A.; Smith, D. R.; Schultz, S. (2001-04-06). "Experimental Verification of a Negative Index of Refraction". Science. 292 (5514): 77–79. Bibcode:2001Sci...292...77S. CiteSeerX 10.1.1.119.1617. doi:10.1126/science.1058847. ISSN 0036-8075. PMID 11292865.
  22. Tretyakov, S.A.; Nefedov, I.S.; Sihvola, A.; Maslovski, S.; Simovski, C. (2003). "Waves and Energy in Chiral Nihility". Journal of Electromagnetic Waves and Applications. 17 (5): 695–706. doi:10.1002/(SICI)1098-2760(19981205)19:5<365::AID-MOP16>3.0.CO;2-#.
  23. Tretyakov, S.A. (2004). "News note on negative refraction in chiral media" (PDF).
  24. Pendry, J. B. (2004-11-19). "A Chiral Route to Negative Refraction". Science. 306 (5700): 1353–1355. Bibcode:2004Sci...306.1353P. doi:10.1126/science.1104467. ISSN 0036-8075. PMID 15550665.
  25. Tretyakov, Sergei; Alitalo, Pekka; Luukkonen, Olli; Simovski, Constantin (2009). "Broadband Electromagnetic Cloaking of Long Cylindrical Objects". Physical Review Letters. 103 (10): 103905. Bibcode:2009PhRvL.103j3905T. doi:10.1103/physrevlett.103.103905. PMID 19792314.
  26. "Broadband invisibility in the microwave range". Retrieved 2018-03-13.
  27. Belov, P. A.; Marqués, R.; Maslovski, S. I.; Nefedov, I. S.; Silveirinha, M.; Simovski, C. R.; Tretyakov, S. A. (2003-03-25). "Strong spatial dispersion in wire media in the very large wavelength limit". Physical Review B. 67 (11): 113103. arXiv:cond-mat/0211204. Bibcode:2003PhRvB..67k3103B. doi:10.1103/PhysRevB.67.113103.
  28. Belov, Pavel A.; Zhao, Yan; Tse, Simon; Ikonen, Pekka; Silveirinha, Mário G.; Simovski, Constantin R.; Tretyakov, Sergei; Hao, Yang; Parini, Clive (2008-05-16). "Transmission of images with subwavelength resolution to distances of several wavelengths in the microwave range". Physical Review B. 77 (19): 193108. Bibcode:2008PhRvB..77s3108B. doi:10.1103/PhysRevB.77.193108.
  29. Maslovski, Stanislav; Tretyakov, Sergei (2003). "Phase conjugation and perfect lensing". Journal of Applied Physics. 94 (7): 4241–4243. doi:10.1063/1.1604935.
  30. Maslovski, Stanislav; Tretyakov, Sergei; Alitalo, Pekka (2004). "Near-field enhancement and imaging in double planar polariton-resonant structures". Journal of Applied Physics. 96 (3): 1293–1300. arXiv:physics/0311089. doi:10.1063/1.1765865.
  31. Simovski, Constantin R.; Tretyakov, Sergei A. (2007-05-14). "Local constitutive parameters of metamaterials from an effective-medium perspective". Physical Review B. 75 (19): 195111. Bibcode:2007PhRvB..75s5111S. doi:10.1103/PhysRevB.75.195111.
  32. Luukkonen, O.; Simovski, C.; Granet, G.; Goussetis, G.; Lioubtchenko, D.; Raisanen, A. V.; Tretyakov, S. A. (June 2008). "Simple and Accurate Analytical Model of Planar Grids and High-Impedance Surfaces Comprising Metal Strips or Patches". IEEE Transactions on Antennas and Propagation. 56 (6): 1624–1632. arXiv:0705.3548. Bibcode:2008ITAP...56.1624L. doi:10.1109/TAP.2008.923327. ISSN 0018-926X.
  33. Luukkonen, O.; Silveirinha, M. G.; Yakovlev, A. B.; Simovski, C. R.; Nefedov, I. S.; Tretyakov, S. A. (November 2009). "Effects of Spatial Dispersion on Reflection From Mushroom-Type Artificial Impedance Surfaces". IEEE Transactions on Microwave Theory and Techniques. 57 (11): 2692–2699. arXiv:0812.1658. Bibcode:2009ITMTT..57.2692L. doi:10.1109/TMTT.2009.2032458. ISSN 0018-9480.
  34. "Sergei Tretiakov - Prizes - Aalto University". research.aalto.fi. Retrieved 2018-04-04.
  35. "The Optical Society Announces 2015 Class of Senior Members". Retrieved 2018-04-04.
  36. "Membership of Finnish Academy of Technical Sciences - Aalto University's research and artistic activities, publications and outputs, contact with researchers., Aalto University". research.aalto.fi. Retrieved 2018-04-04.
  37. Tretyakov, Sergei (2003). Analytical Modeling in Applied Electromagnetics. Boston: Artech House. p. 284. ISBN 9781580533676.
  38. Osipov, Andrey V.; Tretyakov, Sergei A. (2017-04-17). "Modern Electromagnetic Scattering Theory with Applications". Wiley.com. Retrieved 2018-03-13.
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