ELFT HÍRADÓ

[HAJNAL Zoltán <hajnal AT mfa.kfki.hu>]

Dear Colleagues,

our guest of the MFA Seminar (at an unusual time)

***     Wednesday, 2007-10-31 *AFTERNOON* at 14:00
        (MTA MFA, KFKI Campus, Bldg. 26, 1st floor)

will be

***     Dr. Rolandas Tomašiūnas
                Head of Division of Picosecond Photonics
                Institute of Materials Science and Applied Research
                Vilnius University, Lithuania
        http://www.mtmi.vu.lt/lpd/

He is going to present:

***     Nanostructures at Vilnius University:
        technology, investigation and application

The abstract of the talk is attached below.

We always welcome everyone interested!

        Best regards,
                        Z. Hajnal


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        Abstract

Optical recovery time of porous silicon photonic crystal – one of the
common interests in Budapest and Vilnius developed in the frame of COST
P11 Action. Experiments were aimed to measure picosecond kinetics of
reflectance recovery by means of time resolved photo-induced reflectance
method. Reflectance spectrum of the photonic crystal approved the main
YAG:Nd3+ laser harmonic (1064 nm) being located at the edge of photonic
band gap. Domination of the photonic feature was unambiguously displayed
by reversed positive photo-induced reflectivity determined by
photoexcited carriers. Recombination, charging, thermal effects have
been used to analyze the recovery dynamic. Transfer Matrix Method was
adopted for numerical modeling of the kinetics. This work was performed
in collaboration between two groups from the Research Institute for
Technical Physics and Materials Science and the Vilnius University.
Nanostructures of controllable size – is a challenging task for many new
applications in nanotechnology. Electrochemical growth of alumina with
the column-like void structure provides a flexible method for growth of
nanowires of different size. Main tasks of the topic concern
electrochemical growth, non-linear optical properties and application of
copper selenide nanowires. Copper selenide nanoparticles captured much
attention among solar cell technologists. Time resolved investigation
reveal ability of the material to respond to pico- and femtosecond pulse
excitation. Experimental results, theoretical modeling and application
perspectives for laser technology development will be presented.
A short introduction about history and today of Vilnius University
(1579) will be presented.


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