Laboratory of Microwave Spectroscopy
Laboratory of Microwave spectroscopy concentrates on the investigation of various multifunctional materials by applying broadband electromagnetic irradiation. Multiple experimental techniques have been developed at the laboratory to be able characterize electrical properties of these materials in a broad frequency range (10 µHz-750 THz).
Laboratory also have access to an Electron paramagnetic facilities (EPR) for the investigation of the structural phase transitions of metal-organic frameworks, disordered ferroelectrics and semiconductors.
The main topics of the laboratory are:
- Broadband dielectric spectroscopy of perovskite oxides;
- Lattice dynamics of disordered perovskites;
- Phase transitions in metal-organic frameworks;
- Phase transitions in hybrid perovskites for solar cell absobers;
- Polymer composites with carbon nanonstructures for effective electromagnetic shielding;
- Production of thin films and their application for high temperature piezoelectric applications;
- Nonlinear dielectric spectroscopy of functional materials;
- Ultrasonic spectroscopy and electromechanical response of various materials;
- Investigation of low-loss dielectrics for applications in novel telecommunication systems;
Laboratory is involved in many international scientific collaborations with world renowned scientific institutions:
- Oak Ridge National Laboratory (USA);
- Ecole Politechnique de Federalle Lausanne (Switzerland);
- Jožef Stefan Institute (Slovenia);
- Institute of Physics, Czech Academy of Sciences (Czech Republic);
- Institute of Solid State Physics, University of Latvia (Latvia);
- University of Tsukuba (Japan);
- Shimane University (Japan);
- Okayama University (Japan);
- University of Silesia (Poland);
- University of Duisburg-Essen;
- University of Aveiro (Portugal);
- Simon Fraser University (Canada).
Laboratory of THz Electronics and Fluctuations
Laboratory is focused on the characterization of low frequency noise in semiconductor nanostructures and design and investigation of novel electronic components operating at the THz frequency. It is important to understand the noise mechanisms so the charge transport properties and the roles of the defects can be identified in these novel devices. This experimental data is very crucial to the application of these devices.
The novel THz devices are focused on the effective generation of the THz radation. This is developed for novel telecomunication devices and ultrafast transmission of information. It can also assist in tracing illegal substances, imaging in medicine and biology, quality control in industry etc. The current THz emitters and detectors have long response time and low output signal. They are very costly and their reliability needs to be improved. The main goal is the development of room temperature THz detectors.
The main topics:
- Design and development of ultrafast and broadband THz sensors;
- Development of THz sensor matrices for imaging;
- Modelling and characterization of THz emitters;
- Noise characterization of GaSb laser diodes;
- Quality control and investigation of LED and laser diodes by noise and correlated noise spectroscopy;
- Noise investigation of novel multiferroics;
Collaboration:
- Institute of Physics, Goethe‘s University (Germany);
- Laboratory of Pierre Aigrain, Ecole Normale Superieure (France);
- Technicalk University of Vienna (Austria);
- Institute of Optical Sensors, German space Center (Germany).
Laboratory of Nanoionics
Laboratory is focused on the transport of lithium and sodium ions, oxygen vacancies and protons in solid state electrolytes. Superionic materials can be applied in many electrochemical devices: solid oxide fuel cells (SOFC), solid-state batteries, gas sensors, memristors etc. It is necessary to understand the charge transport in these materials. The mechanisms of ionic transport and polarization are investgated by the custom-made coaxial line spectrometers up to 10 GHz frequency and 1250 K tempreature. The four-electrode method is used to supplement this data at low frequencies.
The films of ionic conductors can be prepared by a pusle laser deposition. It enaBles preparing sandwitched structures that can directly be relevent of novel technological applications.
Collaborations:
- Le Mans Universite (France);
- Belarusian State Technological University (Belarus);
- Spanish National Research Council (Spain);
- I. Vernadskii Institute of General and Inorganic Chemistry (Ukraine);
- RTU Institute of Inorganic Chemistry (Latvia);
- Uzhhorod National University (Ukraine);
- National Cheng Kung University (Taiwan).
Center for Telecommunications
Center for Telecommunications is focused on the modeling and experimental investigation of modern mobile networks. One of the main goals is to optimize the transmission parameters and evaluate the crosstalk between different wireless communication systems.
The center was established in 2011 after signing of triletaral agreement between Vilnius University, HUAWEI and the largest telecommunication company “Omnitel” (now Telia). The joint laboratory of these peers were established which has the most modern telecommunication devices which allow to perform the research that is relevant to the industry and scientific purposes.
Collaboration
- Royal Institute of Technology (KTH) (Sweden);
- University of Luxembourg (Luxembourg);
- National public health surveillance laboratory (NPHSL) (Lithuania)