viš. znan. sod. dr. Tomaž Požar

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Short biography

 

Tomaž Požar was born in 1980. After completing his studies in physics at the Faculty of Mathematics and Physics (FMF), University of Ljubljana (Uni.-Lj.), Slovenia, he received his PhD degree in mechanical engineering from the Faculty of Mechanical Engineering (FME, Uni.-Lj.) in 2010. In the years 2004–2016, he performed research and pedagogical work in the Laboratory for Optodynamics and Laser Technology (KOLT, FME, Uni.-Lj.), first as a young researcher and assistant, and then as a research associate. He continued his work as an assistant, assistant professor and research associate in the years 2016-2021 in the Laboratory for Photonics and Laser Systems (FOLAS, FME, Uni.-Lj.). In 2018, he worked as a visiting professor at the State University of Maringá, Paraná, Brazil. Lately, in 2021, he joined the Laboratory for Tribology and Surface Nanotechnology (TINT, FME, Uni.-Lj.) as a senior research associate. He has many years of pedagogical experience in physics, photonics, and laser technologies and systems. His research interests include tribology, photonics, laser generated ultrasound, cavitation, interferometry, and laser-based dimensional metrology. His greatest research achievement is in the field of basic interactions between light and matter, where he and his colleagues discovered a completely new physical mechanism: the formation of ultrasonic waves resulting from the direct transfer of momentum from light to matter.

 

 

Representative bibliography

 

Original scientific articles:

  1. N. G. C. Astrath, E. V. Bergmann, B. Anghinoni, G. A. S. Flizikowski, A. Novatski, C. Jacinto, T. Požar, M. Kalin, L. C. Malacarne and M. L. Baesso (2024). "Towards a comprehensive characterization of spatio-temporal dependence of light-induced electromagnetic forces in dielectric liquids." Scientific Reports 14 (1): 5595 (13pp).
  2. N. G. C. Astrath, B. Anghinoni, G. A. S. Flizikowski, V. S. Zanuto, L. C. Malacarne, M. L. Baesso, T. Požar and D. Razansky (2023). "The role of electrostriction in the generation of acoustic waves by optical forces in water." Photoacoustics 29: 100445 (7pp).
  3. D. Horvat, V. Agrež, T. Požar, B. Starman, M. Halilovič and R. Petkovšek (2022). "Laser-induced shock-wave-expanded nanobubbles in spherical geometry." Ultrasonics Sonochemistry 89: 106160 (12pp).
  4. N. G. C. Astrath, G. A. S. Flizikowski, B. Anghinoni, L. C. Malacarne, M. L. Baesso, T. Požar, M. Partanen, I. Brevik, D. Razansky and S. E. Bialkowski (2022). "Unveiling bulk and surface radiation forces in a dielectric liquid." Light: Science & Applications 11 (1): 103 (10pp).
  5. T. Požar, V. Agrež and R. Petkovšek (2021). "Laser-induced cavitation bubbles and shock waves in water near a concave surface." Ultrasonics Sonochemistry 73: 105456 (11pp).
  6. D. Horvat, T. Požar, B. Starman, M. Halilovič and Rok Petkovšek (2020). "Pressure wave focusing effects following laser medical procedures in human eyes." Applied Physics A: Materials Science & Processing 126 (6): 414 (9pp).
  7. T. Požar, Ž. Pirc, E. Susič and R. Petkovšek (2020). "Simplified detection of cavitation threshold in control valves." Applied Acoustics 165:107320 (6pp).
  8. V. Agrež, T. Požar and R. Petkovšek (2020). "High-speed photography of shock waves with an adaptive illumination." Optics Letter 45 (6): 1547-1550. Editors’ Pick
  9. G. A. S. Flizikowski, O. A. Capeloto, V. G. Camargo, B. Anghinoni, M. L. Baesso, L. C. Malacarne, M. P. Belançon, T. Požar and N. G. C. Astrath (2020). "Laser induced thermoelastic surface displacement in solids detected simultaneously by photothermal mirror and interferometry." Optics Express 28 (5): 7116-7124.
  10. T. Požar and R. Petkovšek (2020). "Cavitation induced by shock wave focusing in eye-like experimental configurations." Biomedical Optics Express 11 (1): 432-447.
  11. T. Požar, D. Horvat, B. Starman, M. Halilovič and R. Petkovšek (2019). "Pressure wave propagation effects in the eye after photoablation." Journal of Applied Physics 125 (20): 204701 (9pp).
  12. M. Dular, T. Požar, J. Zevnik and R. Petkovšek (2018). "High speed observation of damage created by a collapse of a single cavitation bubble." Wear 418-419: 13-23.
  13. T. Požar, J. Laloš, A. Babnik, R. Petkovšek, M. Bethune-Waddell, K. J. Chau, G. V. B. Lukasievicz and N. G. C. Astrath (2018). "Isolated detection of elastic waves driven by the momentum of light." Nature Communications 9: 3340 (11pp). Top 50
  14. T. Požar, M. Halilovič, D. Horvat and R. Petkovšek (2018). "Simulation of wave propagation inside a human eye: acoustic eye model (AEM)." Applied Physics A: Materials Science & Processing 124 (2): 112 (9pp).
  15. J. Laloš, M. Jezeršek, R. Petkovšek and T. Požar (2017). "Laser-induced ultrasonic waveform derivation and transition from a point to a homogeneous illumination of a plate." Ultrasonics 81: 158-166.
  16. T. Požar, J. Rus and R. Petkovšek (2017). "Optical detection of impact contact times with a beam deflection probe." Experimental Mechanics 57 (8): 1225-1238.
  17. O. A. Capeloto, V. S. Zanuto, G. V. B. Lukasievicz, L. C. Malacarne, S. E. Bialkowski, T. Požar and N. G. C. Astrath (2016). "Generation and detection of thermoelastic waves in metals by a photothermal mirror method." Applied Physics Letters 109 (19): 191908 (4pp).
  18. J. Laloš, T. Požar and J. Možina (2016). "Transition from 1D to 2D laser-induced ultrasonic wave propagation in an extended plate." International Journal of Thermophysics 37 (5): 1-10.
  19. J. Laloš, A. Babnik, J. Možina and T. Požar (2016). "Incorporation of a spatial source distribution and a spatial sensor sensitivity in a laser ultrasound propagation model using a streamlined Huygens’ principle." Ultrasonics 66: 34-42.
  20. J. Laloš, T. Požar and J. Možina (2015). "High-frequency calibration of piezoelectric displacement sensors using elastic waves induced by light pressure." Strojniški vestnik - Journal of Mechanical Engineering 61 (9): 533-542.
  21. T. Požar, A. Babnik and J. Možina (2015). "From laser ultrasonics to optical manipulation." Optics Express 23 (6): 7978-7990.
  22. T. Požar and J. Možina (2014). "Detection of sub-nanometer ultrasonic displacements." chapter in Fundamentals of picoscience, ed. K. D. Sattler (Taylor & Francis Group).
  23. T. Požar (2014). "Oblique reflection of a laser pulse from a perfect elastic mirror." Optics Letter 39 (1): 48-51.
  24. T. Požar and J. Možina (2013). "Measurement of elastic waves induced by the reflection of light." Physical Review Letters 111 (18): 185501 (4pp). Editors’ Suggestion
  25. T. Požar and J. Možina (2013). "Mechanical wave motion due to the radiation pressure on gain or absorptive rods." Optics Letters 38 (10): 1754-1756.
  26. A. Pogačnik, T. Požar, M. Kalin and J. Možina (2013). "A homodyne quadrature laser interferometer for micro-asperity deformation analysis." Sensors 13 (1): 703-720.
  27. T. Požar, P. Gregorčič and J. Možina (2013). "Interferometric determination of the high-intensity laser-pulse-material interaction site." Applied Physics A: Materials Science & Processing 112 (1): 165-171.
  28. T. Požar and J. Možina (2012). "Dual-probe homodyne quadrature laser interferometer." Applied Optics 51 (18): 4021-4027.
  29. T. Požar and J. Možina (2012). "Observation of microsphere movement driven by optical pulse: comment." Optics Letters 37 (5): 902-902.
  30. T. Požar and J. Možina (2011). "Enhanced ellipse fitting in a two-detector homodyne quadrature laser interferometer." Measurement Science and Technology 22 (8): 085301 (8pp).
  31. T. Požar, P. Gregorčič and J. Možina (2011). "A precise and wide-dynamic-range displacement-measuring homodyne quadrature laser interferometer." Applied Physics B: Lasers and Optics 105 (3): 575-582.
  32. T. Požar, P. Gregorčič and J. Možina (2011). "Optimization of displacement-measuring quadrature interferometers considering the real properties of optical components." Applied Optics 50 (9): 1210-1219.
  33. T. Požar, P. Gregorčič and J. Možina (2009). "Optical measurements of the laser-induced ultrasonic waves on moving objects." Optics Express 17 (25): 22906-22911.
  34. T. Požar and J. Možina (2009). "Homodyne quadrature laser interferometer applied for the studies of optodynamic wave propagation in a rod." Strojniški Vestnik-Journal of Mechanical Engineering 55 (10): 575-580.
  35. P. Gregorčič, T. Požar and J. Možina (2009). "Quadrature phase-shift error analysis using a homodyne laser interferometer." Optics Express 17 (18): 16322-16331.
  36. T. Požar, R. Petkovšek and J. Možina (2008). "Dispersion of an optodynamic wave during its multiple transitions in a rod." Applied Physics Letters 92 (23): 234101 (3pp).
  37. T. Požar, R. Petkovšek and J. Možina (2008). "Formation of linear momentum in a rod during a laser pulse–matter interaction." Applied Physics A: Materials Science & Processing 92 (4): 891-895.
  38. T. Požar and J. Možina (2008). "Optodynamic description of a linear momentum transfer from a laser induced ultrasonic wave to a rod." Applied Physics A: Materials Science & Processing 91 (2): 315-318.

 

Monograph chapter:

  • T. Požar and J. Možina (2014). "Detection of subnanometer ultrasonic displacements." in "Fundamentals of picoscience." (Boca Raton: CRC, Taylor & Francis Group): 553-577.

 

In media:

 

Full bibliography: Link

 

 

Projects

 

  • Cavitation in control valves (industrial)
  • Laser techniques in metrology (industrial)
  • Light-pressure-induced elastic waves (LIWs) (international, CAPES - Brazil)
  • Spatial and temporal shaping of laser light for minimally invasive ophthalmic procedures (applied project L2-9254, applicant, SRA)

Reference Projects: