Metamaterial research at Aalto University Metamaterial research at Aalto University Aalto University
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Metamaterial research at Aalto
School of Electrical Engineering
Department of Radio Science and Engineering
Sergei Tretyakov and colleagues
• University, Department, SMARAD Center of Excellence,
• Overview of recent research
– Electromagnetics of complex media
– Invisibility and cloaking
– Isotropic artificial magnetics in the visible
– Some other topics
About myself and my visit to Jena...
Optics and photonics
(former Helsinki University of Technology)
• The oldest and the biggest technical university in Finland – About 15000 students and 250 professors
• School of Electrical Engineering (former faculty of Electronics, Communications, and Automation)
• Department of Radio Science and Engineering – Electromagnetics, circuit theory, microwave to terahertz
techniques (antennas, devices) and measurements, space technology, radio wave propagation, advanced artificial electromagnetic materials
• Research groups lead by professors
There is no such place called ”Aalto”
• Campuses of the Aalto University are in Espoo and
How it looks like?
Aalto is growing:
SIX Tenure Track PROFESSOR Positions
The School of Electrical Engineering seeks experts in the following fields:
• Electrical engineering, Power and energy, Automatic control, Embedded systems, Smart living environment;
• Radio science and engineering, Radio astronomy, Space science and engineering, Optoelectronics;
• Communications and networking engineering.
The positions are open at all levels from assistant professor to full tenured professor.
Application deadline is September 30, 2012.
The RAD department was established in the beginning of 2008 by integrating four laboratories of TKK (TKK is today Aalto University School of Science and Technology), namely Radio Laboratory, Electromagnetics Laboratory, Circuit Theory Laboratory, and Laboratory of Space Technology, into a single unit.
– 8 professors
– Over 20 other researchers with a doctor degree
– About 30 doctoral students
– Total number of employees about 100
RAD department is involved in SMARAD CoE in research selected by the Academy of Finland for 2002–2007 (as Smart and Novel Radios Research Unit) and 2008–2013 (as Finnish Centre of Excellence in Smart Radios and Wireless Research).
RAD department is also involved in the MilliLab (Millimetre Wave Laboratory of Finland), which has the status of External Laboratory of the European Space Agency (ESA). MilliLab is a joint research institute between Aalto and VTT.
Department of Radio Science and Engineering (RAD)
The Virtual Institute for Artificial Electromagnetic Materials
and Metamaterials (”Metamorphose VI”) is a non-for-
profit international association whose purposes are the
research, the study and the promotion of artificial
electromagnetic materials and metamaterials.
About 20 European universities and institutions are members.
METAMORPHOSE Virtual Institute www.metamorphose-vi.org
6th International Congress
on Advanced Electromagnetic Materials in
Microwaves and Optics
Metamaterials 2012 St. Petersburg, Russia
17-22 September 2012
Distributed European Doctoral
School on Metamaterials
• Led by Dr. Carsten Rockstuhl, U. Jena
• METAMORPHOSE Virtual Institute
The next EUPROMETA school
• Reconfigurable and tunable metamaterials
– September 21-22, 2012, in conjunction with the
– St. Petersburg, Russia
Artificial electromagnetic materials and applications
4 senior researchers (doctoral degree)
4 doctoral students
visitors + undergraduate students
Research group: Main current research
• Artificial materials (metamaterials) with unusual and extreme
electromagnetic properties – engineering materials for applications
• Nano-scale composite materials and artificial surfaces
• New designs of antennas and microwave devices
• New designs for terahertz and optical devices (imaging and sensing, nano-
• New applications (cloaks, superlenses, solar cells, thermophotovoltaics...)
Classification of electromagnetic
useful and unusual
with long inclusions
useful and unusual
Bulk MTM of small
Optically dense in
one direction, while
sparse or with
(q·a >1) Optically dense
(q·a1) Optically dense
Bianisotropic constitutive relations
Classification of bianisotropic materials
Anti- symmetric part
Material optimized for the purpose?
The ”optimal” spiral The resonant frequency (the total length of the wire) is fixed.
For which shape the particle has the max energy in a given external
I.V. Semchenko, S.A. Khakhomov, and A. L. Samofalov, The Optimal Shape
of a Spiral: Equality of Dielectric,Magnetic and Chiral Properties, NATO
Advanced Research Workshop META’08, Marrakesh, Morocco, May 7-10, 2008.
Optimal metamaterials Chiral media
”Optimal” spiral inclusions: n=0, κ=1 – ”extreme parameter values”
Negative refraction, negative reflection, ”standing spirals”,... S. Tretyakov, I. Nefedov, A. Sihvola, S. Maslovski, C. Simovski, Waves and energy in chiral nihility,
Journal of Electromagnetic Waves and Applications, vol. 17, no. 5, pp. 695-706, 2003.
E. Saenz, I. Semchenko, S. Khakhomov, K. Guven, R. Gonzalo, E. Ozbay, S. Tretyakov,
Modelling of spirals with equal dielectric, magnetic and chiral susceptibilities, Electromagnetics,
vol. 28, pp. 476–493, 2008.
I.V. Semchenko, S.A. Khakhomov and S.A. Tretyakov, Chiral metamaterial with unit negative
refraction index, The European Physical Journal - Applied Physics, vol. 46, no. 3, p. 32607, 2009.
Optimal metamaterials for linear polarization Omega media
Omega coupling is a very general phenomenon
Particle energy (omega particle)
But for evanescent waves the impedance is imaginary
and we can optimize the particle shape to maximize the particle energy.
Bianisotropic materials optimized for strong interactions with
Total absorption in thin bianisotropic layers
Example: Total absorption
in an omega-layer
General approach to design of thin laye