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Romania
Citizenship:
Ph.D. degree award:
Ovidiu
Toma
-
UNIVERSITATEA BUCURESTI
Researcher | Teaching staff
Web of Science ResearcherID:
not public
Personal public profile link.
Expertise & keywords
optics
Thin films
Spectroscopic ellipsometry
Lasers
Differential equation
Projects
Publications & Patents
Entrepreneurship
Reviewer section
Vectorial MOKE approach for the investigation of microstructured magnetic thin films.
Call name:
P 2 - SP 2.1 - Proiect experimental - demonstrativ
PN-III-P2-2.1-PED-2016-0327
2017
-
2018
Role in this project:
Coordinating institution:
INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA
Project partners:
INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO); UNIVERSITATEA BUCURESTI (RO)
Affiliation:
UNIVERSITATEA BUCURESTI (RO)
Project website:
http://www.infim.ro/95PED_MicroMag
Abstract:
A complex method for the investigation of some important magnetic parameters of technological interest for magnetic recording media or concerning the magneto-conduction functionality of lateral micro-sized senzors with nanometric thickness is proposed. The considered approach, based on the suitability of the magneto-optic Kerr effect (MOKE) for the investigation of microstructured magnetic thin films, involves both the realization of a specific multifunctional magneto-optic device and the implementation of different measuring methodologies providing information on the magnetic behaviour of the micro-magnetic systems. With respect to the first issue, the practical realization and development of a demonstrative model of advanced high precision optoelectronic device for measuring complex magnetic properties in micrometer sized and nanometer thick magnetic components is envisaged. Innovative solutions in adapting new configurations for the MOKE investigation, via micro-sized focusing on vizualized magnetic micro-structures and specific sample stage with three dimensional scanning and rotational degrees will be considered. The main advantages of the proposed multifunctional vector system (TRL3 level) as compared to already existing MOKE systems will be: (i) the combination of precision, speed and reliability of local (micrometer size) measurements, (ii) the ability to be adapted to both fundamental and applied scientific research and (iii) the suitability for controlling the production process of multi-component (integrated) sensors and actuators. With respect to the second issue, different complex methodologies (TRL3 level) for obtaining as much as complete information on the hysteretic behaviour, anisotropy directions, easy axis distribution, magnetic relaxation phenomena in microstructured thin films and even on magnetic domain configuration will be proposed and implemented on the multifunctional MOKE demonstrator.
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Multilayered Photovoltaic Structures for Space Applications
Call name:
Joint Applied Research Projects - PCCA 2013 - call
PN-II-PT-PCCA-2013-4-0776
2014
-
2017
Role in this project:
Coordinating institution:
UNIVERSITATEA BUCURESTI
Project partners:
UNIVERSITATEA BUCURESTI (RO); INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO); INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA SI INGINERIE NUCLEARA " HORIA HULUBEI " - IFIN - HH (RO); MGM STAR CONSTRUCT S.R.L. (RO)
Affiliation:
UNIVERSITATEA BUCURESTI (RO)
Project website:
http://mdeo.eu/MDEO/Proiecte/PN288-2014/
Abstract:
Thin film based PV structures are well fitted for space technology, due to their reduced mass. This proposal aims at investigating technological routes for fabricating thin film based multiple junction photovoltaic (PV) structures of the type ZnS/ZnSe/CdTe in superstrate configurations and to study their endurance to energetic (2-10 MeV) protons and alpha particles, which are the main components of cosmic rays, at 10^10 - 10^14 cm^-2 fluencies. In the superstrate configuration one starts with depositing the transparent front-electrode onto the glass substrate which supports the entire structure, and then, on top of it the ZnS, ZnSe, CdTe layers and finally the back-electrode. The efficiencies of the cells in superstrate configurations will be characterized, and also their endurance to irradiation. Special attention will be paid to the physical properties and the electrical response of the back-contact metal/CdTe. CdTe, an excellent photon absorber with a forbidden gap of 1.4 eV and a large light absorption coefficient, is known as a “difficult” semiconductor: due to its rather large work function, a special care must be taken to prepare a quasi-ohmic low-resistance contact with a metal. Ion implantation will be used to control electrical properties of CdTe layer, by doping with properly selected electrically active impurities. A special attention will be paid to the quality of interfaces; an optimization of the PV structures will be performed. The nature of the defects introduced by irradiation will be studied and their influence on the performance of the structures will be indicated.
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Applications of cutting-edge technologies based on MEMS structures and nonlinear optical effects in measuring electric current parameters on high-voltage lines
Call name:
Program 31PNCDI MEMS IT
2007
-
2010
Role in this project:
Key expert
Coordinating institution:
UNIVERSITATEA BUCURESTI
Project partners:
UNIVERSITATEA BUCURESTI ()
Affiliation:
UNIVERSITATEA BUCURESTI ()
Project website:
Abstract:
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Unconventional Materials for Microtechnology – Research and Experimentation of Elastomer-Based Microstructures for Applications in the Field of Microsystems
Call name:
Program 15CEEX/2005
2005
-
2008
Role in this project:
Key expert
Coordinating institution:
UNIVERSITATEA BUCURESTI
Project partners:
UNIVERSITATEA BUCURESTI ()
Affiliation:
UNIVERSITATEA BUCURESTI ()
Project website:
Abstract:
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Analog optical image information processing unit
Call name:
Program CEEX Nr.139I03/2006
2006
-
2008
Role in this project:
Key expert
Coordinating institution:
UNIVERSITATEA BUCURESTI
Project partners:
UNIVERSITATEA BUCURESTI ()
Affiliation:
UNIVERSITATEA BUCURESTI ()
Project website:
Abstract:
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Light-emitting and light-modulating poly-composite microstructures - electro-optical properties
Call name:
Program 44CEEX1/10.10.2005
2005
-
2007
Role in this project:
Key expert
Coordinating institution:
UNIVERSITATEA BUCURESTI
Project partners:
UNIVERSITATEA BUCURESTI ()
Affiliation:
UNIVERSITATEA BUCURESTI ()
Project website:
Abstract:
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Study of chaotic light emission of extended cavity laser diodes and the use of chaotic system coupling in encoding information on optical carriers
Call name:
Program CERES-2002 Nr. 81/11.11.2002
2003
-
2005
Role in this project:
Key expert
Coordinating institution:
UNIVERSITATEA BUCURESTI
Project partners:
UNIVERSITATEA BUCURESTI ()
Affiliation:
UNIVERSITATEA BUCURESTI ()
Project website:
Abstract:
Read more
New organometallic compounds; study of opto-electronic properties
Call name:
Program CNCSIS - nr. 33618/2002
2002
-
2004
Role in this project:
Key expert
Coordinating institution:
UNIVERSITATEA BUCURESTI
Project partners:
UNIVERSITATEA BUCURESTI ()
Affiliation:
UNIVERSITATEA BUCURESTI ()
Project website:
Abstract:
Read more
Opto-electronic properties of polymers doped with metal ions
Call name:
Program CNCSIS - 37116/2000
2000
-
2002
Role in this project:
Partner team leader
Coordinating institution:
UNIVERSITATEA BUCURESTI
Project partners:
UNIVERSITATEA BUCURESTI ()
Affiliation:
UNIVERSITATEA BUCURESTI ()
Project website:
Abstract:
Read more
FILE DESCRIPTION
DOCUMENT
List of research grants as project coordinator or partner team leader
Significant R&D projects for enterprises, as project manager
R&D activities in enterprises
Peer-review activity for international programs/projects
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