FACULTIES AND INSTITUTES
 

Solid State Optics Research Group

The Laboratory of Solid State Optics was established in 1985. The first head of the laboratory was appointed to be Assoc. Prof. Dr. A. Audzijonis. After the establishment of the laboratory, scientific, self-supporting projects started to take place with various organisations, such as the Kiev Physics Institute, Lithuanian Semiconductor Physics Institute, and the Electrography Institute. With the funding from these projects various pieces of scientific equipment were obtained that are still in use today. The laboratory was further developed by Antanas Stasiukynas, who initiated the modernisation and creation of new scientific equipment. While modernising the equipment, 19 new inventions were made.

A crystal growing laboratory was established where semi-conductive ferroelectric crystals are grown through various methods. These crystals are characterised by their applicable optical, electric and piezoelectric properties and have one or another type of phase transition.

Prof. Dr. Habil. Algirdas Audzijonis has been the head of the LEU Laboratory of Solid State Optics since 1985. For over 15 years he has been leading the scientific research that investigates semi-conductive ferroelectric A5B6C7 type crystals grown within the laboratory.

The crystals grown in the laboratory are investigated experimentally and theoretically not only locally, but also in scientific laboratories abroad. The investigations mainly focus on the electronic structure of the crystals, their optical properties, spectrum of vibrations in paraelectric and ferroelectric phases.

Currently, the laboratory actively participates in the teaching of graduate and postgraduate students. The students perform provided physical experiments with the scientific equipment.

The laboratory cooperates with University of Silesia (Poland), Karlsruhe Institute of Applied Physics (Germany) and Voronezh State University (Russia).

 

Goals of the Research Group

 

  • Experimentally investigate the optical and electric properties of our own-grown semi-conductive ferroelectric crystals;
  • Theoretically calculate the spectrum of vibrations, dependencies on temperatures, composition of compounds, deformations in the field of phase transition;
  • Investigate the nature of phase transition and the soft mode in SbSI type crystals;
  • Teach graduate and postgraduate students to perform scientific experiments;
  • Publish the results of the newest research in Lithuanian and International publications.

 

Tasks of the Research group

 

  1. Prepare new research scientists and Physics science doctors by using the material-technical base of the laboratory;
  2. Raise the scientific level of undergraduate and graduate theses;
  3. Raise the scientific and subject qualification of the department lecturers and technical staff;
  4. Introduce students to the newest achievements in solid state physics, optics and electronics. Introduce graduate students to “Physical experiment” laboratory practices.

 

Main research topic

 

Electronic structure, optical and electrical properties, vibrational spectra and electronic structure, phase transitions of semiconductors-ferroelectrics
Led by Prof. Dr. Habil. Algirdas Audzijonis.
Research team: Prof. Dr. Habil. Gediminas Gaigalas, Assoc. Prof. Dr. Raimundas Žaltauskas, Dr. Leonardas Žigas, Antanas Kvedaravičius, Raimundas Sereika.
The semi-conductive ferroelectric A5B6C7 type crystals are grown within the laboratory. These crystals are investigated experimentally. The optical properties are investigated using various differential methods. The spectrum of vibrations of the crystals are investigated with a modernised Fourier spectrometer, with a wavelength of 20-1000 µm. Special attention is paid to the investigation of optical and dielectric properties while the material is undergoing phase transitions.
The electronic structure, optical properties and spectrum of vibrations of the crystals are investigated theoretically through the use of computer programmes like “Photon”, “WIEN 2K” and others.

The newest pieces of research and their results are published in local and international press. To date the research group has published over 100 combined publications.

 

Contacts

 

Studentu st. 39, rooms L126, L125a, L114
LT-08106 Vilnius
Tel.: +370 5 273 48 57
Fax: +370 5 273 48 57
E-mail: kkol@leu.lt

 

Staff