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Proceedings of Conferences

Session 1 "Artificial Materials and Metamaterials"

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	Transport in narrow minigap superlattices and the terahertz Bloch oscillator (167.71 Kbytes) hot!	2004-06-29
Transport in narrow minigap superlattices and the terahertz Bloch oscillator D.I.Zinchenko⁽¹⁾, A.A.Andronov⁽¹⁾, M.N.Drozdov⁽¹⁾, Yu.N.Nozdrin⁽¹⁾, A.Sosnin⁽¹⁾, A.Ustinov⁽¹⁾, V.I.Shashkin⁽¹⁾, A.A.Marmalyuk⁽²⁾ and A.A.Padalitsa⁽²⁾ ⁽¹⁾Institute for Physics of Microstructures, Russian Academy of Sciences, Russia, ⁽²⁾SIGM plus, Russia Abstract – Transport properties of GaAs-GaAlAs weak barrier superlattices are studied by computer simulation and observation of current-voltage curves and the terahertz emission. Existence of terahertz dynamic negative differential conductivity is demonstrated in the simulation. The observed terahertz emission is considered as due to incoherent Bloch oscillation emission. Prospect for the terahertz Bloch oscillator based on such superlattices is discussed.
		hits: 1551

	Transmission properties of one dimensional left handed composite meta-materials (195.75 Kbytes) hot!	2004-06-29
Transmission properties of one dimensional left handed composite meta-materials O.F. Gundogdu, N. Katsarakis, M. Kafesaki, C.M. Soukoulis, E.N. Economou FO.R.T.H., Institute of Electronic Structures and Laser, P.O. Box 1527, 71110, Heraklion, Crete, Greece Abstract- The electromagnetic behavior of one-dimensional composite meta-materials (CMMs) consisting of rectangular Split Ring Resonators (SRRs) and continuous wires was studied. The main purpose was to investigate if those composite meta-materials act as left handed materials which have the unique property of having both effective permittivity and effective permeability negative [1]. The transmission of electromagnetic waves (between 7-14 GHz) through the CMM was measured as well as the transmission through its various constituents (SRR-only and wire-only structures, and CMMs containing SRRs with no gaps). The transmission measurements were performed in free-space, using a HP 8722 ES network analyzer and microwave standard-gain horn antennas. It was found that CMM shows a transmission peak between 8.5 and 9.5GHz, within the frequency region where the SRR dip appears and below the cut-off frequency of the system of wires+closed SRRs. This was taken as a strong evidence for left handed behavior.
		hits: 1324

	Submillimeter imaging system based on AlGaAs/GaAs hot electron bolometer mixers (216.51 Kbytes) hot!	2004-06-29
Submillimeter imaging system based on AlGaAs/GaAs hot electron bolometer mixers D.V. Morozov, S.N. Maslennikov, R.V Ozhegov, K.V. Smirnov, O.V. Okunev, and G.N. Gol’tsman Physics Department, Moscow State Pedagogical University, Russia Electromagnetic radiation of the submillimeter (SMM) range is dispersed and absorbed significantly less than infrared (IR) radiation when passing through different objects. That is the reason for the development of a SMM imaging system. In fact, strong absorption of IR radiation in water and water vapor makes it impossible to use IR air and sea navigation systems when it is fog or raining...
		hits: 1298

	Polarization transformation in the periodic structure of arrays of complex-shaped elements (59.18 Kbytes) hot!	2004-06-29
Polarization transformation in the periodic structure of arrays of complex-shaped elements D. Tyrnov Institute of Radio Astronomy of National Academy of Sciences of Ukraine, Krasnoznamennaya Street 4, 61002 Kharkov, Ukraine, email: tyrnov@rian.ira.kharkov.ua
		hits: 1293

	Numerical study of low profile directive antennas based on metamaterials (147.68 Kbytes) hot!	2004-06-29
Numerical study of low profile directive antennas based on metamaterials X. Dardenne and C. Craeye Universitй catholique de Louvain, Laboratoire TELE, Place du Levant, 2, 1348 Louvain-la-Neuve, Belgium, dardenne@tele.ucl.ac.be Abstract – This paper describes in detail the measurement procedure of a new artificial magnetic particle. A waveguide measurement technique is used to measure the scattering parameters of the particle. The results are processed to extract the magnetic polarizability. We generally introduce the measurement setup and carry out in detail the analysis for processing the results. The goal is to show that even when measuring complex particles, reasonable measurement accuracy can be achieved with a rather simple measuring cell.
		hits: 1348

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