20th APROPOS – Advanced Properties and Processes in Optoelectronic Materials and Systems

The 20^th APROPOS conference (the 5^th under the new name) continues a series of symposia held in Vilnius since 1971, which began as “Plasma and instabilities in semiconductors”, and later became “Ultrafast Phenomena in Semiconductors” (UFPS). The conference aims to reveal and share new ideas in technology, research, and applications of advanced optoelectronic materials, to discover modern trends in optoelectronics research, and to discuss processes and fascinating phenomena arising when optics meets electronics.

Main topics include Semiconductor Nanostructures, Ultrafast and THz Phenomena, Advanced Photonics Systems, Nano- and Biophotonics, Organic Materials for Optoelectronics. One day before the conference, we are organising a free of charge tutorial session. During the conference, we will also invite you to participate in a special Lublin Readings session.

Lublin Readings

This is a special session with invited lectures dedicated to Lithuanian-Polish scientific cooperation. It also includes a traditional invited historical lecture on the most important events and heritage of the Polish–Lithuanian Commonwealth and beyond.

This year, we are going to take a deeper dive into Memory Politics, Symbolic Geography, and Competitive Claims to the 19th-Century City, asking a key question: “Whose Vilnius?“

After the session, we invite you to further explore the history of Vilnius by listening to the stories of the Central Vilnius University Ensemble and its historical Astronomical Observatory.

Student tutorial session

29^th of September

Students and young researchers are invited to participate in the special tutorial session “Frontiers of Photonics & Semiconductor Technology“
Program:

Hybrid-electronics technologies by Prof. Viktor Krozer (tentative)

Optoelectronics that works above cut-off frequency by Prof. Alvydas Lisauskas

Integrated Photonic Circuits: Enabling a New Era of Photonics by Dr. Armandas Balčytis

Invited speakers

Prof. Xi-Cheng Zhang
University of Rochester, New York, USA

Professor Xi-Cheng Zhang is a leading figure in terahertz photonics and optics, serving as the Parker Givens Chair at the University of Rochester’s Institute of Optics. Zhang conducted pioneering research in groundbreaking terahertz research during two decades at Rensselaer Polytechnic Institute, where he founded the Center for THz Research and pioneered ultrafast laser-based THz techniques. Zhang’s work advanced free-space terahertz optoelectronics and demonstrated novel uses for ultrafast “T-ray” pulses in imaging and spectroscopy. Since 2012 at Rochester, Professor Zhang’s group has continued to push the frontiers of terahertz science, developing advanced THz sources and detection techniques for spectroscopy and non-destructive imaging. Zhang has earned broad recognition as a Fellow of the AAAS, APS, IEEE, Optica, and SPIE, with major awards such as Optica’s William F. Meggers Award (2012) and the IRMMW-THz Kenneth J. Button Prize (2014) acknowledging pioneering contributions to terahertz science.

Prof. Miriam Serena Vitiello
CNR-NANOTEC, Pisa, Italy

Miriam Serena Vitiello is a senior researcher at the National Research Council of Italy (CNR-NANOTEC, Pisa), internationally recognized for her contributions to terahertz photonics and nanoelectronics. Her research focuses on the development of compact terahertz sources and detectors based on semiconductor and quantum devices, including quantum cascade lasers, as well as hybrid plasmonic architectures. By combining nanofabrication, spectroscopy, and device physics, Vitiello has advanced terahertz technologies relevant to spectroscopy, sensing, and imaging. Her work has been supported by major competitive funding programs, including European Research Council grants, and has helped shape the landscape of modern terahertz science.

Prof. Taiichi Otsuji
Tohoku University, Sendai, Miyagi, Japan

Taiichi Otsuji is a leading researcher in terahertz electronics and photonics and a professor at Tohoku University in Japan, known for uniting cutting-edge semiconductor physics with high-frequency photonics. He has developed plasmonic devices that harness electron oscillations in semiconductor heterostructures and graphene to generate and detect terahertz waves, opening new avenues for THz sensing technologies. Otsuji’s breakthroughs include the realisation of tunable terahertz sources using graphene, demonstrating ultrafast phenomena that extend the performance limits of conventional terahertz emitters and detectors. Otsuji’s achievements have earned widespread recognition both in Japan and internationally. He is a Fellow of IEEE, Optica (OSA), and the Japan Society of Applied Physics.

Prof. Willie Padilla
Duke University, North Carolina, USA

Willie Padilla is a leading expert in metamaterials and applied physics and a distinguished professor at Duke University. His doctoral research at UC San Diego (Ph.D. 2004) contributed to early experimental breakthroughs in metamaterials – Padilla was part of the team that demonstrated the first negative-index metamaterial, a revolutionary concept enabling artificial “left-handed” optical materials. Padilla has since pioneered a range of dynamic and functional metasurfaces, from actively tunable THz devices to metamaterial absorbers that achieve near-unity absorption under designed operating conditions of incident radiation. Padilla’s innovative approach to imaging led to the creation of single-pixel terahertz cameras using compressive sensing, drastically reducing the detector arrays required for THz imaging. He has received top honors including the U.S. Presidential Early Career Award for Scientists and Engineers in 2009, and is recognised as a Fellow of the Optical Society (Optica) and of IEEE for his contributions to photonics and metamaterials.

Dr. Shang-Hua Yang
National Tsing Hua University, Taiwan

Dr. Shang-Hua Yang stands out in the terahertz research community for bridging theory and application, from fundamental plasmonic photonics to real-world wireless and imaging systems. At National Tsing Hua University, Yang has built a vibrant lab exploring ultrafast electro-optics and THz devices, and he is spearheading Taiwan’s efforts in terahertz technology as director of a dedicated terahertz research centre at NTHU. Yang’s innovations include new schemes for high-speed terahertz wireless links and non-invasive THz imaging, reflecting his group’s ability to push technology boundaries in both communications and sensing. Yang has garnered significant acclaim at a young age: major honours such as the Ta-You Wu Memorial Award (2024) and the NTHU Young Faculty Research Award (2020) highlight the impact of his early-career achievements. Yang, a Senior Member of IEEE and a Member of Optica and SPIE, contributes to the scientific community beyond research by serving on organising and technical program committees for leading optics and electromagnetics conferences.

Prof. Kuniaki Konishi
University of Tokyo, Japan

Prof. Kuniaki Konishi is an Associate Professor at the University of Tokyo’s Graduate School of Science, where he leads the Konishi Laboratory at the Institute for Photon Science and Technology. A specialist in the interaction between light and nano-scale artificial structures to achieve advanced optical control, his research covers metamaterials, superchiral fields, and the physics of ultrashort pulse lasers for high-precision microfabrication. His work is frequently featured in high-impact journals, including Nature Photonics and Advanced Optical Materials.

Dr. Karolis Kazlauskas
Vilnius University, Lithuania

Dr Karolis Kazlauskas is a leading figure in the field of organic semiconductor photonics, heading the Organic Optoelectronics Laboratory at Vilnius University’s Institute of Photonics and Nanotechnology. He has made seminal contributions to materials for organic light-emitting devices and stimulated-emission applications, designing novel molecular structures that exhibit efficient fluorescence and improve the operational stability of organic emitters. Kazlauskas’s group is also known for advancing photon upconversion techniques, enabling the conversion of low-energy infrared light into higher-energy visible emissions – an approach that has potential applications in areas like foldable displays and light-emitting fabrics. He has authored numerous highly cited papers in journals such as J. Mater. Chem. C and Adv. Optical Mater. and is frequently invited to present his work, including invited talks at major international workshops and conferences in Japan and elsewhere. Dr Kazlauskas’s contributions have earned him accolades such as the Lithuanian Academy of Sciences’ Young Scientist Fellowship and multiple Vilnius University awards for research excellence, cementing a reputation as a leader in optical materials research.

Prof. Polina Kuzhir
University of Eastern Finland, Finland

Prof. Polina Kuzhir is a Professor at the Institute of Photonics, University of Eastern Finland, and an internationally recognized expert in the electromagnetics of carbon nanostructures, theoretical and experimental photonics with the current focus on biosensors. Her research spans 2D materials, graphene, and nanocarbon-based devices, with a particular focus on terahertz (THz) technology and biophotonics. A leader of numerous high-impact European initiatives, she has authored over 330 peer-reviewed papers in the field of nanomaterials.

Dr. Linas Minkevičius
Centre for Physical Sciences and Technology (FTMC), Lithuania

Dr. Linas Minkevičius is a senior researcher at Terahertz Photonics Laboratory and the head of the Optoelectronic Systems Characterisation Laboratory and the Department of Optoelectronics in the Centre for Physical Sciences and Technology (FTMC). He also serves as a professor at Vilnius University’s Faculty of Physics. Dr. Minkevičius has gained international recognition for his work on room-temperature THz image recording matrices, which earned him the award for the best doctoral thesis in physics and technology in Lithuania in 2016. His primary research focuses on the development of compact imaging and detection systems in the terahertz (THz) and infrared (IR) regions. He leads research into diffractive optics and metasurfaces designed specifically for the sub-millimetre wave range. Further, his work on focusing and beam-shaping elements, including high-efficiency zone plates and integrated silicon lenses, has been instrumental in miniaturising THz systems without sacrificing performance. Recent scientific efforts by Dr. Minkevičius have centred on creating innovative, flat optics-based THz imaging systems using semiconductor heterostructures and specialised diffractive elements. His work has been published in high-impact journals and presented at over 80 international conferences.

Dr. Erik Waller
Fraunhofer ITWM, Germany

Coming soon…

Lublin Readings session

Prof. Agnieszka Siemion
Warsaw University of Technology, Poland

Agnieszka Siemion has pushed the frontiers of modern optics into the terahertz realm, crafting a niche where purely photonic phenomena intersect with millimetre-wave science. Prof. Siemion leads cutting-edge experiments at Warsaw University of Technology on THz diffractive optics, creating components like frequency-selective surfaces and multi-focus lenses that unlock new capabilities in the far-infrared spectrum. Siemion’s experimental prowess has yielded novel THz imaging techniques – including systems capable of distinguishing minute differences in tissue composition – which hold promise for non-invasive medical diagnostics and security scanning. She was actively involved with major research initiatives, including a LIDER project on terahertz systems for skin cancer research and an OPUS project investigating terahertz optical MIMO concepts. Beyond research, Siemion is celebrated for outstanding teaching – winning the student-bestowed Golden Chalk Award five times – and has taken on a key leadership role as Vice-Dean for Student Affairs (since 2020), helping foster the next generation of optical physicists.

Dr. Marcin Bialek
Institute of High Pressure Physics, PAS, Poland

Dr. Marcin Białek is a researcher at the Institute of High Pressure Physics of the Polish Academy of Sciences and a former postdoctoral fellow at EPFL, Switzerland. His research focuses on the intersection of terahertz (THz) optics and spintronics, specifically exploring the strong coupling between electromagnetic radiation and magnetic excitations. He is currently leading the PASIFIC project “TeraMag,” which investigates new methods for the electrical detection and manipulation of magnon-polariton states.

Dr. Rusnė Ivaškevičiūtė-Povilauskienė
Centre for Physical Sciences and Technology (FTMC), Vilnius

Dr. Rusnė Ivaškevičiūtė-Povilauskienė is a leading researcher in terahertz photonics at the Centre for Physical Sciences and Technology (FTMC). Her work centres on the design of sophisticated THz components, including diffractive optical elements and metasurfaces tailored to manipulate beam wavefronts and polarisation states precisely. Her research is particularly noted for its impact on non-destructive testing, biomedical sensing, and the development of imaging modalities that push spatial resolution beyond conventional limits.

Dr. Darius Staliūnas (special guest)
Vilnius University, Lithuania

Dr. Darius Staliūnas is a Chief Researcher at the Lithuanian Institute of History and a member of the Lithuanian Academy of Sciences. A leading expert on 19th-century history, his research focuses on the Russian Empire’s nationality policies and the complex politics of memory within the former Grand Duchy of Lithuania. Having held visiting positions at institutions such as UC Berkeley and the Hebrew University of Jerusalem, he was awarded the Lithuanian Science Prize in 2016 for his contributions to the field.

At the APROPOS conference, Dr. Staliūnas will explore the shifting symbolic and geographical identities of 19th-century Vilnius. In his presentation, “Whose Vilnius? Memory Politics, Symbolic Geography, and Competitive Claims to the 19th-Century City,” he will examine how various cultural and political narratives intersected to shape the city’s identity. His talk will delve into the competing mental maps and historical claims that defined the urban landscape during a transformative era of imperial and national transition.