Gintaras Valušis "Terahertz imaging - towards compact and effective systems"

Описание: A lecture by Gintaras Valušis (Vilnius University & FTMC):
Terahertz imaging - towards compact and effective systems

This lecture is a part of the Candela Open Lectures: Exploring the Terahertz Foundamental Principles & Frontiers series.
To learn more about the lecture series, visit the website: https://www.candela.org.pl/thz-lectures

Abstract

Room temperature terahertz (THz) imaging is a powerful tool for a non-destructive inspection for different types of dielectrical materials, security checks, or medical applications [1]. However, for practical implementation in real environment conditions THz imaging still experiences challenges because of low powers of THz emitters, reliability of sensitive THz detectors and compact solutions in the design of passive optical components. A particular focus needs to be attributed to the development of compact imaging systems entailing enhanced functionality, reduced power consumption, and increased convenience in use [1].

The given lecture covers possible routes for rational design of compact and effective THz multispectral imaging. Principles of room temperature semiconductors-based THz emitters and detectors will be described; silicon diffractive optics-based THz light engineering, enabling thus both compact focusing, extended focus geometry and structured light application in THz imaging will be considered [2]. Special attention will be attributed to lensless nonparaxial THz photonic setups and their features, peculiarities in design and operational advantages. Possible technological challenges as well as extrapolations of possible further evolution in compact THz imaging will be given as well.

[1] G. Valušis, A. Lisauskas, H. Yuan, W. Knap, and H. G. Roskos, Roadmap of Terahertz Imaging 2021, Sensors 21, 4092 (2021).
[2] R. Ivaškevičiūtė-Povilauskienė, P. Kizevičius, E. Nacius, D. Jokubauskis, K. Ikamas, A. Lisauskas, N. Alexeeva, I. Matulaitienė, V. Jukna, S. Orlov, L. Minkevičius, G. Valušis, Light: Science & Applications 11, 1 326 (2022).
[3] S. Orlov, R. Ivaškevičiūtė‐Povilauskienė, K. Mundrys, P. Kizevičius, E. Nacius, D. Jokubauskis, K. Ikamas, A. Lisauskas, L. Minkevičius, and G. Valušis, Laser Photon. Rev. 18, 2301197 (2024).

Lecturer’s bio

Gintaras Valušis graduated from the Vilnius University, Physics Faculty, in 1985. He acquired his PhD and habilitation at the Vilnius University in 1992 and 2007, respectively. 1995 – 1996 he obtained post-doc in ultrafast spectroscopy of semiconductor nanostructures at Institute of Applied Photo Physics, Dresden University of Technology, Germany. In 2000 and 2003 he was Alexander von Humboldt fellow in topic of terahertz physics at Physics Institute, J. W. Goethe University, (Frankfurt/M, Germany).

Currently, Gintaras withholds positions of head of the Optoelectronics Department at the Center for Physical Science and Technology (FTMC), Vilnius, Lithuania, and professor in Institute of Photonics and Nanotechnology of Physics Faculty at the Vilnius University. His scientific interests include optoelectronics, terahertz physics and physics of semiconductor devices

Video Chapters

0:00 Start
0:04 Speaker introduction
1:23 Lecture
1:35:27 Conclusions
1:38:02 Q&A session and discussion