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A Review: Semiconductor Characterization by Terahertz Excitation Spectroscopy

A comprehensive review written by Arūnas Krotkus, Ignas Nevinskas and Ričardas Norkus on the terahertz excitation spectroscopy and it’s applications is recently published in the journal “Materials” by MDPI Publisher. The experimental technique known as the THz excitation spectroscopy is used as a contactless method to study the band structure and investigate the ultrafast processes of various technologically important materials. A recent decade of investigations with the THz excitation spectroscopy method is reviewed in this paper.

The review is available as an open access publication through this DOI: https://doi.org/10.3390/ma16072859


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The 2023 terahertz science and technology roadmap

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

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European patent on the method of polymethylmethaacrylate (PMMA) removal from a graphene surface by photoexposure was published by EPO

European Patent Office (EPO) published our patent EP3936476B1 — just before 55th FiDi (National Physicist’s Day)! Green method of PolyMethylMethaAcrylate (PMMA) removal from a Graphene surface by photoexposure was invented by Natalia Alexeeva and Irmantas Kašalynas. Read details about EP3936476 here: https://register.epo.org/application?number=EP21169747

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How Lithuanian semiconductor creators impressed colleagues from Taiwan

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.


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European patent on the method for fabrication of recessed electrical elements (EP3975224) is published by EPO

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

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New paper about structured THz radiation: Imaging with Airy beam

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


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International Workshop on Nitride Semiconductors (IWN)

Head of laboratory Dr. Irmantas Kašalynas and PhD student Justinas Jorudas represented THz Photonics laboratory at International Workshop on Nitride Semiconductors (IWN) which took place in Berlin, Germany from 10th till 14th of October. Our lab presented scientific results in 1 oral and 3 poster presentations.

Head of laboratory Dr. Irmantas Kašalynas gives a talk at IWN meeting,

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New study on formation and drift of space-charge domains with velocity of sound in n-type GaN

New paper by Roman Balagula et al. under the title ”Space-charge domains in n-type GaN epilayers under pulsed electric field” is published in the Applied Physics Letters.

The experimental work investigates the formation and drift of space-charge domains with velocity of sound in n-type GaN. The findings defines the constraints
for the design of GaN-based power electronic devices.

The paper can be reached through this DOI: https://doi.org/10.1063/5.0098951

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See you soon again!

THz Atelier laboratory thanks all friends for productive meetings and discussions at the IRMMW-THz 2022 conference at TU Delft, the Netherlands. In photo from left to right: Justinas Jorudas, dr. Vytautas Janonis, Daniil Pashnev, dr. Roman Balagula, Surya Revanth Ayyagari, and head of the lab dr. Irmantas Kašalynas.