THz Atelier – Terahertz photonics laboratory
Department of Optoelectronics, Center for Physical Sciences and Technology (FTMC)
This week we celebrate the issue of Laser & Photonics Review with a cover decorated with our graphical abstract from the article by Sergejus Orlov, Rusnė Ivaškevičiūtė-Povilauskienė et al. This promoted review paper is available as free access publication through the link: https://doi.org/10.1002/lpor.202470028
Išsamus ir įkvepiantis pokalbis su mūsų terahercų fotonikos laboratorijos vyriausiuoju moksliniu darbuotoju, optoelektronikos skyriaus vedėju, ir FTMC direktoriumi akademiku prof. habil. dr. Gintaru Valušiu apie Lietuvos ateities viziją.
“[..] reikalingas bendras supratimas, kad mes visi čia esame labai reikalingi, kad visi galime prisidėti prie proveržio, surasti savo vietą čia ir dabar” – sako Gintaras Valušis.
Interviu galima rasti čia. Interviu paskelbtas lrt.lt žinių portale.
A new research recently published in the scientific journal Food Bioscience includes the THz time-domain spectroscopy results of the bovine bone powder. The optical properties were measured in THz range for adult cows’ femur and tibia bones from the same breed and in the age range from 93 to 120 months. The spectral data were analyzed using principal component analysis and agglomerative hierarchical clustering techniques.
Results of the study showed that the anatomy of the bones was more significant rather than the age. Interestingly, refractive index increased with age of the cattle and was
higher for femur bone if comped to tibia bone.
The work was accomplished in collaboration with Pontificia Universidad Católica de Chile, Millennium Institute for Research in Optics (Chile) and INRAE – Centre Clermont-Auvergne-Rhône-Alpes (France)
The paper can be accessed through this link: 10.1016/j.fbio.2024.103978
New open access article is published in the journal Nanomaterials (MDPI) by Vladislovas Čižas, Natalia Alexeeva, Kirill N. Alekseev and Gintaras Valušis. Theoretical study dives into the physical mechanisms of high-frequency gain in a doped semiconductor superlattice
The findings of the research contributes to the advancement of new miniature GHz–THz frequency generators, amplifiers, and dividers operating at room temperature.
The research was partially funded by the Marius Jakulis Jason Foundation and the Research Council of Lithuania (No 01.2.2-LMT-K-718-03-0096).
The paper can be reached through this DOI: . https://doi.org/10.3390/nano13131993
The research article by Roman B. Balagula, Liudvikas Subačius, Paweł Prystawko, and Irmantas Kašalynas is published in Journal of Applied Physics, AIP Publishing. The work entitled “Electro-optical modulation of terahertz beam by drifting space-charge domains in n-GaN epilayers” investigates the transmission modulation of THz field in GaN semiconductor as a response to space-charge domains under near-to-breakdown electrical field conditions.
The open access research article is available through https://doi.org/10.1063/5.0152661
The work was supported by the Research Council of Lithuania through the “Hybrid plasmonic components for THz range (T-HP)” Project (Grant No. DOTSUT-184) funded by the European Regional Development Fund according to the supported activity “Research Projects Implemented by World-class Researcher Groups” under the Measure No. 01.2.2-LMT-K-718-03-0096. The work at Warsaw was supported by the National Center for Research and Development (Grant No. TECHMATSTRATEG-III/0003/2019/EnerGaN).
New work by I. Grigelionis et al. was published in the scientific journal Sensors from MDPI publisher. Authors report on the experimental evidence of thermal terahertz emission tailored by magnetic polariton excitations in entirely GaAs-based structures equipped with metasurfaces. Thermal emission was measured at 390 C temperature in the range from 0.7 THz to 1.3 THz, depending on the size of the square metacells.
The magnetic polariton resonance quality factors obtained at elevated temperatures (Q ~ 3.3 to 5.2) are very similar to those of MIM structures as well as to 2D plasmon resonance quality at cryogenic temperatures.
The open access paper can be reached through https://doi.org/10.3390/s23104600
This research has received funding from the Research Council of Lithuania (LMTLT), agreement No. S-MIP-22-76.
New roadmap for THz science and technology is just published in the Journal of Physics D: Applied Physics by IOP Publishing. Among the number of distinguished authors one can find Gintaras Valušis who have significantly contributed to the publication. Congratulations!
The roadmap is a collection of sections addressing the particular aspects of latest THz technology developments. It is indeed the excellent source to get the insights to the future of THz science.
The publication under open access license can be accessed trough this DOI: https://doi.org/10.1088/1361-6463/acbe4c
EN: In the “Curiosity Gene” episode the significance and future of semiconductor technologies in Lithuania in the new light of Taiwan transfer of transistor manufacture secrets to Lithuania is presented. The head of FTMC prof. Gintaras Valušis and senior research fellow dr. Linas Minkevičius talks straight from THz Photonics Lab of FTMC. The episode in Lithuanian language can be accessed through this link to the archives of national broadcaster LRT.
LT: “Smalsumo genas” laidoje pasakojama apie puslaidininkinių technologijų svarbą ir perspektyvas Lietuvoje, Taivanui perleidžiant tranzistorių gamybos paslaptis. Laidoje iš Terahercų fotonikos laboratorijos kalba FTMC direktorius prof. Gintaras Valušis ir mokslininkas dr. Linas Minkevičius. Laidos įrašą kviečiame pažiūrėti paspaudus šią nuorodą į LRT mediateką.
European Patent Office (EPO) just published the patent for the method for fabrication of recessed electrical elements (EP3975224) by inventors Irmantas Kašalynas (head of our lab), Simonas Indrašiūnas, Pawel Prystawko, and Piotr Kruszewski. Two later inventors are our collaborators from Institute of High Pressure Physics at Polish
Academy of Sciences, Poland. The patent can be accessed here: https://register.epo.org/application?number=EP21183785
New paper by Rusnė Ivaškevičiūtė-Povilauskienė et. al just published in Light Science and Applications journal by Nature publishing group entitled ”Terahertz structured light: nonparaxial Airy imaging using silicon diffractive optics”. The work demonstrates the structured nonparaxial THz light in the form of Airy, Bessel, and Gaussian beams generated in a compact way using exclusively silicon diffractive optics prepared by femtosecond laser ablation technology. The structured THz light consistently outperforms the conventional one in resolution and contrast.
The findings open new frontiers of structured light applications in imaging and inverse scattering problems. Imaging of stacked graphene layers with THz Airy beam revealed potential to be applied for inspection of 2D materials quality.
The article is freely available under Open Access license and can be reached through the DOI address: https://doi.org/10.1038/s41377-022-01007-z