Article
Chemistry, Multidisciplinary
Luminita Nicoleta Dumitrescu, Eusebiu-Rosini Ionita, Ruxandra Birjega, Andrada Lazea-Stoyanova, Maria-Daniela Ionita, George Epurescu, Ana-Maria Banici, Simona Brajnicov, Florin Andrei, Andreea Matei
Summary: This study presents the deposition of thin films of lamellar clays using laser techniques, focusing on the optimization of deposition parameters to achieve highly oriented crystalline films. The films were characterized using various techniques and different wetting properties were achieved by adjusting the deposition techniques and parameters.
Article
Nanoscience & Nanotechnology
Kaelyn Leake, Jose Martinez, Alexander Stensland, Hank Yochum
Summary: This paper introduces a novel modification to the traditional layer by layer process, adding three-dimensional control to the technique. By irradiating the substrate with laser light during the polycation and/or polyanion dipping cycles, polymer thin films with controlled thicknesses can be fabricated. The results show that the laser modification method can alter the height and absorbance of the thin films.
Article
Chemistry, Physical
Jesse A. Johnson II, David Brown, Emily Turner, Chris Hatem, Bruce Adams, Xuebin Li, Kevin S. Jones
Summary: Pulsed laser annealing was used to treat Si and Si1-xGex thin films, investigating the impact of different laser powers and amorphous layer thicknesses on microstructures. It was found that the right combination of power and amorphous layer thickness can achieve defect-free regrowth, while roughening of the liquid/solid interface on the surface leads to lateral germanium segregation.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Ceren Korkut, Kamil Cinar, Ismail Kabacelik, Rasit Turan, Mustafa Kulakci, Alpan Bek
Summary: Understanding the dynamics of laser crystallization process of Ge thin films using nanosecond pulsed infrared lasers is crucial for producing high-quality crystalline films for various applications. By implementing suitable parameters, the researchers were able to successfully crystallize amorphous Ge films with domain sizes exceeding tens of micrometers using a ns pulsed IR laser. This work demonstrates a promising method for locally crystallizing thin films with minimized thermal energy budget.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Engineering, Electrical & Electronic
Alok Kumar Jain, C. Gopalakrishnan, P. Malar
Summary: In this study, growth of Sb2Se3 thin films was attempted using pulsed laser deposition technique with presynthesized ball-milled Sb2Se3 compound material as a source. The films grown at 320 degrees C exhibited crystalline orientation along (020) and presence of Sb2O3, confirmed by Raman and X-ray photoelectron spectroscopy analysis. Optical transmittance studies revealed a bandgap of approximately 1.29 eV, matching reported values, with absorption values around 10^6 cm(-1) in the visible region. Scanning electron microscopy showed films grown at 320 degrees C to have a crack-free surface and a thickness of around 1 μm. Energy-dispersive X-ray spectroscopy indicated near stoichiometric compositional values with slight selenium deficiency. Resistivity measurements showed Sb2Se3 films grown at 320 degrees C to have a value of approximately 6 x 10^8 Omega-cm, and hot point probe measurement confirmed the film to be a p-type semiconductor.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Physical
Stefan Andrei Irimiciuc, Sergii Chertopalov, Maksym Buryi, Zdenek Remes, Martin Vondracek, Ladislav Fekete, Michal Novotny, Jan Lancok
Summary: CuI thin films were deposited with controlled morphology, structure, and defect nature in different Ar atmospheres. Band gap tailoring was achieved by controlling the plasma ion kinetic energy. Variation in Ar pressure allowed control over the nature of vacancies. Addition of Ar resulted in preferential scattering and energy losses of Cu ions in the plasma.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Rovena Veronica Pascu, George Epurescu, Iulian Boerasu, Ana -Maria Banici Niculescu, Dumitru Manica, Alexandra Maria Isabel Trefilov, Bogdan Alexandru Sava
Summary: Samarium doped ceria thin films were successfully deposited on Si (100) substrates at 500 and 600 degrees C using Pulsed Laser Deposition. X-ray Diffraction confirmed the presence of Samarium Doped Cerium Oxide crystalline compound in the films. Atomic Force Microscopy and Scanning Electron Microscopy revealed high quality films with low roughness, especially for the sample deposited at 600 degrees C. X-ray Photoelectron Spectroscopy showed an increased proportion of Ce3+ in the deposited films compared to the target. Spectroscopic Ellipsometry analysis calculated a refractive index under 2.2 in the visible and near-infrared domain. Nanoindentation tribometric measurements indicated a decrease in elasticity modulus and hardness with increasing substrate temperature. These films show potential as electrolyte materials for new generation electrochemical devices.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Xiangnan Gong, Menglei Feng, Hong Wu, Hongpeng Zhou, Chunhung Suen, Hanjun Zou, Lijie Guo, Kai Zhou, Shijian Chen, Jiyan Dai, Guoyu Wang, Xiaoyuan Zhou
Summary: This work focuses on improving the quality of highly (100)-oriented SnSe thin films for thermoelectric applications. By controlling key parameters during pulsed-laser deposition and performing vacuum thermal annealing, the film quality was enhanced. The best crystal quality and uniform orientation were achieved on SiO2/Si substrate at 673 K followed by thermal annealing at 673 K for 30 min, showcasing promising Seebeck coefficient and power factor values.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Coatings & Films
Falko Jahn, Steffen Weissmantel
Summary: Boron carbide is a super-hard material suitable for wear resistant coatings. Its hardness is significantly influenced by substrate temperature, with little effect from laser fluence.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Yukiko Obata, Igor A. Karateev, Ivan Pavlov, Alexander L. Vasiliev, Silvia Haindl
Summary: The study explores the challenges in pulsed laser deposition of superconducting FeSe thin films, highlighting the importance of interface control, stoichiometry, and surface protection for potential sensor applications. Sophisticated engineering protocols are needed to overcome these limitations and enhance the application potential of FeSe thin films in sensor devices, particularly for thicknesses below 30 nm.
Article
Chemistry, Multidisciplinary
Lubomir Prokes, Magdalena Gorylova, Katerina Cermak Sraitrova, Virginie Nazabal, Josef Havel, Petr Nemec
Summary: Pulsed UV laser deposition was used to prepare thin films of Sn50-xAsxSe50 to investigate the influence of low arsenic concentration on the properties of the deposited layers. Thin films containing 0.5 atom % of As exhibited extreme values that significantly differed from those of other samples. Signals of SnmSen+ clusters with low m and n values were observed in the mass spectra of both parent powders and deposited thin films.
Article
Engineering, Electrical & Electronic
R. K. Kalaiezhily, V. Jayaseelan, K. Kamala Bharathi, M. Navaneethan, Senthil Kumar Eswaran
Summary: This study reports the fabrication of Nb-doped SrTiO3 thin films of various thicknesses using pulsed laser deposition, and reveals changes in crystallinity and band gap with thickness. Additionally, impedance spectroscopy shows an increase in dc conductivity with temperature, indicating thermal activation of niobium donors in the films.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Physical
Tatyana Kunkel, Yuri Vorobyov, Mikhail Smayev, Petr Lazarenko, Vladimir Veretennikov, Vladimir Sigaev, Sergey Kozyukhin
Summary: Crystallization of amorphous thin films of Ge2Sb2Te5 (GST225) under femtosecond pulses excitation can occur in two ways: formation of fine-grained polycrystalline material at moderate laser fluence levels, and production of larger grains closer to the beam axis at higher fluence levels, leading to inhibition of nucleation due to high cooling velocity. The type of substrate (metallic or oxide) and film thickness also affect the crystallization process due to light penetration depth and reflection from the film-substrate interface.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Natalia Volodina, Anna Dmitriyeva, Anastasia Chouprik, Elena Gatskevich, Andrei Zenkevich
Summary: The crystallization of as-grown amorphous Hf0.5Zr0.5O2 (HZO) thin films to the metastable ferroelectric phase by pulsed laser annealing (PLA) is investigated in this study. Different modes of PLA are utilized, with variations in pulse duration, to examine the resulting effects on the films' properties. The research suggests that millisecond PLA can effectively induce the ferroelectric phase in the films, while shorter pulse durations do not yield significant crystallization effects.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2021)
Article
Chemistry, Physical
Yongjian Luo, Zhenxun Tang, Xiaozhe Yin, Chao Chen, Zhen Fan, Minghui Qin, Min Zeng, Guofu Zhou, Xingsen Gao, Xubing Lu, Jiyan Dai, Deyang Chen, Jun -Ming Liu
Summary: This study demonstrates that ferroelectric properties can be observed in non-capped dopant-free HfO2 thin films by adjusting the deposition temperature, oxygen pressure, and thickness. A maximum polarization strength of 14.7 mu C/cm(2) was achieved in a 7.4 nm-thick film, suggesting a new method for fabricating high-quality ferroelectric HfO2 thin films.
JOURNAL OF MATERIOMICS
(2022)
Article
Physics, Fluids & Plasmas
A. Skoulakis, G. Koundourakis, A. Ciardi, E. Kaselouris, I Fitilis, J. Chatzakis, M. Bakarezos, N. Vlahakis, N. A. Papadogiannis, M. Tatarakis, V Dimitriou
Summary: The dynamics of plasmas produced by low current X-pinch devices are investigated using two different computational codes. The simulation results show that both codes can accurately handle the evolution of the plasma and provide detailed understanding of the mechanisms behind plasma expansion, jet formation, and pinch generation in X-pinch experiments.
PLASMA PHYSICS AND CONTROLLED FUSION
(2022)
Article
Physics, Fluids & Plasmas
A. Grigoriadis, G. Andrianaki, M. Tatarakis, E. P. Benis, N. A. Papadogiannis
Summary: The interaction between multi-10 TW chirped laser pulses and N-2 gas jet targets as a test case for multi-electron targets is experimentally examined. It is found that positively chirped laser pulses accelerate electrons more efficiently compared to the other types of pulses. The dynamic ionization of inner-shell electrons near the peak of the laser pulse enables additional electron injection mechanisms for efficient electron acceleration.
PLASMA PHYSICS AND CONTROLLED FUSION
(2023)
Article
Chemistry, Multidisciplinary
Spyros Brezas, Markos Katsipis, Yannis Orphanos, Evaggelos Kaselouris, Kostas Kechrakos, Nikos Kefaloyannis, Helen Papadaki, Antonis Sarantis-Karamesinis, Stylianos Petrakis, Ioannis Theodorakis, Efstratios Iliadis, Tilemachos Karagkounidis, Ioannis Koumantos, Michael Tatarakis, Makis Bakarezos, Nektarios A. Papadogiannis, Vasilis Dimitriou
Summary: An integrated method combining different techniques was proposed to evaluate the vibroacoustic behavior of a carbon fiber bouzouki. Experimental measurements, simulations, and psychoacoustic tests were conducted to assess the sound and playability of the instrument. The results of the simulations matched well with the experimental measurements, and new findings were obtained for optimizing the manufacturing and vibroacoustic behavior of carbon fiber instruments.
APPLIED SCIENCES-BASEL
(2023)
Article
Acoustics
Evaggelos Kaselouris, Stella Paschalidou, Chrisoula Alexandraki, Vasilis Dimitriou
Summary: The transient acoustic dynamics of a splash cymbal are investigated using the Finite Element Method-Boundary Element Method. Real three-dimensional motion data from the interaction of drummer-drumstick-cymbal is used for simulating the interaction. Intensified free strokes are used as loading conditions for both experiment and simulation. Motion capturing and numerical methods allow computing the sound generated by the combined interaction of the cymbal and the performer, providing a novel perspective in musical instrument design, optimization, and manufacturing.
Article
Materials Science, Multidisciplinary
Kyriaki Kosma, Konstantinos Kaleris, Evaggelos Kaselouris, Emmanouil Kaniolakis-Kaloudis, Stylianos Petrakis, Yannis Orphanos, Emmanouil Gagaoudakis, Vassilis Binas, Efthimios Bakarezos, Michael Tatarakis, Vasilis Dimitriou, Nektarios A. Papadogiannis
Summary: In this work, acoustic strains in thin ZnO layers were generated using optoacoustic transduction and monitored using a degenerate pump-probe transient reflectivity optical setup. The experimental findings were supported by a thermal vibro-acoustic finite element model. The results show good agreement between experimental and numerical simulations, establishing a novel characterization method for a wide range of materials and structures.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Konstantinos Kaleris, Emmanouil Kaniolakis-Kaloudis, Evaggelos Kaselouris, Kyriaki Kosma, Emmanouil Gagaoudakis, Vassilis Binas, Stelios Petrakis, Vasilis Dimitriou, Makis Bakarezos, Michael Tatarakis, Nektarios A. Papadogiannis
Summary: Nano-acoustic strain generation in thin metallic films via ultrafast laser excitation is commonly used in material science, imaging and medical applications. This study shows that tantalum, among transition metals, exhibits superior photoacoustic properties. Experimental results using femtosecond laser pulses on thin tantalum films deposited on Silicon substrates are presented, showing the correlation between nano-acoustic strains and photoacoustic transduction efficiency. Computational results and simulations using a thermo-mechanical finite element analysis also support the findings. Lastly, the possibility of generating modulated acoustic pulse trains inside crystalline substrate structures for γ-ray generation is discussed.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Instruments & Instrumentation
G. Andrianaki, A. Grigoriadis, A. Skoulakis, I. Tazes, D. Mancelli, I. Fitilis, V. Dimitriou, E. P. Benis, N. A. Papadogiannis, M. Tatarakis, I. K. Nikolos
Summary: This study presents a research on the design, manufacturing, evaluation, and performance of a 3D-printed nozzle for LWFA experiments. The use of these 3D-printed nozzles allows for the creation of different gas density profiles according to experimental needs, improving control over the electron source.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Chemistry, Multidisciplinary
Valina Mylona, Eugenia Anagnostaki, Stylianos Petrakis, Kyriaki Kosma, Steven Parker, Mark Cronshaw, Nektarios Papadogiannis, Martin Grootveld
Summary: This study examined the attenuation properties of different photosensitizers activated by specific laser wavelengths. The results showed that, except for toluidine blue illuminated by an 808 nm laser, the other photosensitizers had an attenuation range of 63% to 99%. Therefore, when used at appropriate concentrations, these photosensitizers can allow sufficient wavelength-dependent light transmission, leading to beneficial photobiomodulation effects.
APPLIED SCIENCES-BASEL
(2023)
Article
Physics, Atomic, Molecular & Chemical
Stylianos Petrakis, Makis Bakarezos, Michael Tatarakis, Emmanouil P. Benis, Nektarios A. Papadogiannis
Summary: This study focuses on the generation of high-order harmonics in a semi-infinite cell by femtosecond laser pulses. Despite the simplicity of the experimental method, various phenomena affect the spectral and divergence characteristics of the generated high harmonic XUV frequency comb. By varying the laser pulse chirp and focusing conditions, as well as gas density, intense harmonic spectral and divergence variations were measured.
Article
Acoustics
Evaggelos Kaselouris, Makis Bakarezos, Michael Tatarakis, Nektarios A. Papadogiannis, Vasilis Dimitriou
Summary: This paper presents a review study on the modeling and simulation of stringed musical instruments using the finite element method. It focuses on methods capable of simulating the behavior of soundboards, assembled musical instrument boxes, fluid-structure interaction, and the interaction with the surrounding air. Currently, there is no numerical model that includes all components and the full geometry.
