Studies

No.

Field

Supervisor

Theme LT

Theme EN

T 008 Materials Engineering

1.

T 008

Dr. Alexandr Belosludtsev ✉

Magnetroninio dulkinimo technologijos optimizavimas optinių dangų paruošimui

Optimization of magnetron sputtering technology for optical coating preparation

Magnetron sputtering is one of the most efficient technology for the preparation of various unique optical coatings. Previously, it was shown how it is possible effectively tune coating properties by combining various materials and tuning deposition conditions. Nevertheless, further investigation of plasma reactions, surface modifications and material growth investigation are needed. The particular PhD theses will be related to the investigation and optimization of the preparation process, growth of coatings, analysis of structure and properties of final element.

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2.

T 008

Dr. Rytis Buzelis ✉

Plonų dielektrinių sluoksnių formavimas ant struktūrizuotų elementų naudojant atominio sluoksnio nusodinimo technologiją

Formation of thin dielectric layers on structured elements using atomic layer deposition technology

Description in English is not available.

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3.

T 008

Dr. Mindaugas Gedvilas ✉

Nanogardelių tiesioginis lazerinis rašymas ultratrumpais lazerio impulsais

Direct laser writing of nanogratings using ultra-short laser pulses

Relevance: Periodic nanostructures (nano-gratings) formed by laser irradiation have found a wide range of applications over the past decade. Such nano-gratings are formed to control the surface wetting of the materials, enhance the sensitivity of the Raman scattering spectra, improve the light absorption properties, change the color of the material used for light excitation, micro-optical elements, bio-sensors, direct laser writing of Bragg reflectors and diffractive optical elements for optic fibers, etc.
Scientific novelty: Only in recent years, have works emerged in the scientific literature related to the formation of highly regular nanograting on the surface of the material using femtosecond and picosecond pulses. In the fields of nanograting applications, the main parameter characterizing them is their period and it is therefore important to be able to control it. There is still little research works found in the scientific literature dedicated to direct laser writing of nano-gratings, and this is a completely new area of science and technology that still has a lot of unknowns.
Prospects: The purpose of the proposed Ph.D. thesis is to investigate the peculiarities of highly regular nanograting formation on the material surface using ultra-short pulsed laser radiation. This is a very promising area of science and technology, as understanding the formation mechanisms of nanograting will optimize the process and write them quickly in a large area, thus extending their application capabilities. This will result in accelerated processing speed and improved quality that will improve nanograting writing technology.

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4.

T 008

Doc. Dr. Vytautas Jukna ✉

Geometrinės fazės elementų gamybos tobulinimas, optimizavimas ir naujų optinių elementų kūrimas bei integravimas į lazerines sistemas

Geometrical phase element fabrication methods refinement, optimization, and new optical element development and integration into the laser systems

Description in English is not available. 

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5.

T 008

Dr. Genrik Mordas ✉

Lazerinių 3D spausdinimo technologijų taikymas kompozitinių struktūrų gamybai

Application of laser 3D printing technologies for the production of composite structures

Description in English is not available. 

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6.

T 008

Dr. Evaldas Stankevičius ✉

Plazmoninių metalinių darinių formavimas naudojant lazerines technologijas

Formation of plasmonic metal structures using laser technologies

Surface plasmon polariton (SPP) is an exponentially vanishing surface electromagnetic wave propagating along with the metal-dielectric interface that results from the interaction of external electromagnetic radiation with collective electron oscillations (plasmons) in the outer layer of the metal. SPP waves cannot be excited by direct light irradiation to smooth metal surfaces. SPP resonance appears by the light absorption and is highly dependent on the environmental medium (dielectric constant). Based on this dependence, a wide range of practical applications of plasmonic structures are possible. The phenomenon of plasmon resonance is widely used in biological sensors and is a susceptible test method. It is based on a local change in the refractive index of the environmental medium at the metal-dielectric interface due to a change in the location, intensity, phase, or polarisation of the plasmon resonance. Sensors based on this phenomenon are used to detect tumours, antigens, and allergens in food, in the study of drugs and proteins, in the monitoring of cellular processes, or the kinetics of adsorption and desorption of different molecules. The main methods used to excite polaritons are using a prism, scanning near-field optical microscopy, or grating. In this work, the formation of the metal gratings exciting SPP using laser interference lithography and direct writing will be investigated. The created structures will be tested for Raman spectral studies.  

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7.

T 008

Dr. Evaldas Stankevičius ✉

Hibridinių nanodalelių sintezė taikant terminį lazerinį apdirbimą plonose dangose

Synthesis of hybrid nanoparticles using laser-induced heat treatment of thin films

Nanoparticles, due to their specific properties, open up new technical and commercial possibilities. They are used in various technological processes, electronics, medicine, pharmacy, and optics. Nanoparticle size sometimes becomes the cause of quantum effects such as plasmon resonance and the semiconductor properties of metals. Nanoparticles are used in biosensors due to their optical and electrical properties. One of the most popular components of biosensors is nanoparticles of precious metals (Au and Ag). The use of nanoparticles in biosensors improves their sensitivity. The resonance absorption of the localised surface plasmon is greatly influenced by the size, material, and shape of the nanoparticles. The synthesis of hybrid nanoparticles enables the development of nanoparticles with unique properties, opening up new possibilities in metal-enhanced fluorescence (MEF), surface-enhanced Raman scattering (SERS), and biomedicine. 

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8.

T 008

Dr. Artūras Ulčinas ✉

Didelio ploto ir aukštos erdvinės skyros paviršiaus tyrimo metodų kūrimas ir taikymas

Large area and high spatial resolution surface analysis methods – development and application

The trend towards reducing the dimensions of the system and components while at the same time increasing the processing area is continuing as a technological approach to increase the throughput and efficiency while reducing the energy and materials cost. For example, in semiconductor chip technology critical dimensions are below 10 nm with the diameter of the wafer 300 mm. Therefore, the demand for surface characterization methods having large information throughput, high spatial resolution and capability to investigate large areas is growing.

The goal of this project is to develop the fast-scanning probe microscopy methods allowing to probe the areas of 1 mm² with the spatial resolution better than 10 nm. The work will be focused on three main areas: a) investigation of the physical phenomena and the parameters governing the probe-surface interaction; b) development of the control methods for optimized acquisition of information about the surface in terms of speed and resolution; c) application of the developed methods for investigation of the surface structures and functional coatings, with the aim of laying a ground for the technologies of defect identification and analysis and high-throughput biochemical nanosensors. 

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9.

T 008

Dr. Artūras Ulčinas ✉

Atominių jėgų mikroskopijos metodikos ląstelių struktūriniams ir viskoelastinių savybių tyrimams bioimitacinėse aplinkose

Atomic force microscopy methods for investigation of structural and viscoelastic properties of living cells on biomimetic substrates

Description in English is not available. 

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