Associate Professor

Address:	University of Ljubljana Faculty of Mechanical Engineering Aškerčeva 6 SI-1000 Ljubljana Slovenia
Email:	peter.gregorcic@fs.uni-lj.si
Phone:	+386 1 477 1 172
Room:	804
G Profile:
Bibliography:	COBISS database | SICRIS profile

  Publications | Patents | Invited Lectures | Awards | Youtube Channel | CV

Research Projects
Follow @SurfaceApps_rp

2021-2024	Engineering of future innovative and smart hybrid materials by combining laser-functionalized metals and living cells (LaserInSMArT), ARRS Research project,  project leader
2019-2022	Laser micro and nano structuring for development of biomimetic metallic surfaces with unique properties (LaMiNaS), ARRS Research project (J2-1741),  project leader
2019-2022	New Conventional and Additive Manufactured Biodegradable Fe-Mn alloy with Tailored Biodegradability, ARRS Research project (J2-1729), project leader at Faculty of Mechanical Engineering (PI: Dr. Matjaž Godec)
2017-2020	Surface functionalization by nanosecond fiber laser texturing (nsFLaT), SPI Lasers Ltd., project leader

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Research Fields

+	Laser Surface Engineering
+	Surface Functionalization
+	Laser-Material Interaction
+	Laser Ablation in Liquids
+	Laser Material Processing
+	Lasers in Medicine

Selected Publications

[2023]	M. Senegačnik & P. Gregorčič, Diffraction-driven laser surface nanostructuring: Towards patterning with curved periodic surface structures, Appl. Surf. Sci. 610, 155486 (2023)  DOI: 10.1016/j.apsusc.2022.155486 | [Research Data]
[2022]	L. Hribar, P. Gregorčič, M. Senegačnik, M.Jezeršek, The Influence of the Processing Parameters on the Laser-Ablation of Stainless Steel and Brass during the Engraving by Nanosecond Fiber Laser, Nanomaterials 12, 232 (2021) DOI: 10.3390/nano12020232
+	M. Zupančič, P. Gregorčič, M. Bucci, C. Wang, G. M. Aguiar, M. Bucci, The wall heat flux partitioning during the pool boiling of water on thin metallic foils, Appl. Therm. Eng., 2021.  DOI: 10.1016/j.applthermaleng.2021.117638 | [Research Data]
[2021]	M. Zupančič & P. Gregorčič, Laser Surface Engineering for Boiling Heat Transfer Applications, in  Materials with Extreme Wetting Properties: Methods and Emerging Industrial Applications, Springer International Publishing, Cham, 2021, pp. 245-303.  DOI: 10.1007/978-3-030-59565-4_12 | [Press Release]
+	M. Senegačnik, K. Kunimoto, S. Yamaguchi, K. Kimura, T. Sakka, P. Gregorčič, Dynamics of laser-induced cavitation bubble during expansion over sharp-edge geometry submerged in liquid – an inside view by diffuse illuminations, Ultrason. Sonochem. (2021) DOI: 10.1016/j.ultsonch.2021.105460 | [Research Data] | [Press Release]
+	P. Gregorčič, Comment on “Bioinspired Reversible Switch between Underwater Superoleophobicity/Superaerophobicity and Oleophilicity/Aerophilicity and Improved Antireflective Property on the Nanosecond Laser-Ablated Superhydrophobic Titanium Surfaces”, ACS Appl. Mater. Inter. 13, 2117 (2021) DOI: 10.1021/acsami.9b23462 | [Press Release]
[2020]	M. Hočevar, B. Šetina Batič, M. Godec, V. Kononenko, D. Drobne, P. Gregorčič, The interaction between the osteosarcoma cell and stainless steel surface, modified by high-fluence, nanosecond laser pulses, Surf. Coat. Techn. 394, 125878 (2020) DOI: 10.1016/j.surfcoat.2020.125878 | [Press Release]
+	M. Može, M. Senegačnik, P. Gregorčič, M. Hočevar, M. Zupančič, I. Golobič, Laser-Engineered Microcavity Surfaces with a Nanoscale Superhydrophobic Coating for Extreme Boiling Performance, ACS Appl. Mater. Interfaces 12, 24419 (2020) DOI: 10.1021/acsami.0c01594 | [Press Release]
+	M. Petkovšek, M. Hočevar, P. Gregorčič, Surface functionalization by nanosecond-laser texturing for controlling hydrodynamic cavitation dynamics, Ultrason. Sonochem. 67, 105126 (2020) DOI: 10.1016/j.ultsonch.2020.105126 | [Press Release]
+	M. Senegačnik, M. Jezeršek, P. Gregorčič, Propulsion effects after laser ablation in water, confined by different geometries, Appl. Phys. A 126, 136 (2020) DOI: 10.1007/s00339-020-3309-y
[2019]	P. Zakšek, M. Zupančič, P. Gregorčič, I. Golobič, Investigation of Nucleate Pool Boiling of Saturated Pure Liquids and Ethanol-Water Mixtures on Smooth and Laser-Textured Surfaces, Nanosc. Microsc. Therm. 24, 29 (2019) DOI: 10.1080/15567265.2019.1689590
+	M. Conradi, T. Sever, P. Gregorčič, A. Kocijan, Short- and Long-Term Wettability Evolution and Corrosion Resistance of Uncoated and Polymer-Coated Laser-Textured Steel Surface, Coatings 9, 592 (2019) DOI: 10.3390/coatings9090592
+	M. Može, M. Zupančič, M. Hočevar, I. Golobič, P. Gregorčič, Surface chemistry and morphology transition induced by critical heat flux incipience on laser-textured copper surfaces, Appl. Surf. Sci. 490, 220 (2019) DOI: 10.1016/j.apsusc.2019.06.068
+	M. Senegačnik, M. Hočevar, P. Gregorčič, Influence of processing parameters on characteristics of laser-induced periodic surface structures on steel and titanium, Procedia CIRP 81, 99 (2019) DOI: 10.1016/j.procir.2019.03.018
+	J. S. Hoppius, S. Maragkaki, A. Kanitz, P. Gregorčič, E. L. Gurevich, Optimization of femtosecond laser processing in liquids, Appl. Surf. Sci. 467-468, 255 (2019) DOI: 10.1016/j.apsusc.2018.10.121
[2018]	P. Gregorčič, M. Zupančič, I. Golobič, Scalable Surface Microstructuring by a Fiber Laser for Controlled Nucleate Boiling Performance of High- and Low-Surface-Tension Fluids, Sci. Rep. 8, 7461 (2018) DOI: 10.1038/s41598-018-25843-5
+	J. Laloš, P. Gregorčič, M. Jezeršek, Observation of laser-induced elastic waves in agar skin phantoms using a high-speed camera and a laser-beam-deflection probe, Biomed. Opt. Express 9, 1893 (2018) DOI: 10.1364/BOE.9.001893
+	P. Gregorčič, M. Conradi, L. Hribar, M. Hočevar, Long-Term Influence of Laser-Processing Parameters on (Super)hydrophobicity Development and Stability of Stainless-Steel Surfaces, Materials 11, 2240 (2018) DOI: 10.3390/ma11112240
+	J. Voglar, P. Gregorčič, M. Zupančič, I. Golobič, Boiling performance on surfaces with capillary-length-spaced one- and two-dimensional laser-textured patterns, Int. J. Heat. Mass. Tran. 127, 1188-1196 (2018) DOI: 10.1016/j.ijheatmasstransfer.2018.07.056
+	Č. Donik, A. Kocijan, I. Paulin, M. Hočevar, P. Gregorčič, M. Godec, Improved biodegradability of Fe–Mn alloy after modification of surface chemistry and topography by a laser ablation, Appl. Surf. Sci. 453, 383-393 (2018) DOI: 10.1016/j.apsusc.2018.05.066
+	M. Conradi, A. Drnovšek, P. Gregorčič, Wettability and friction control of a stainless steel surface by combining nanosecond laser texturing and adsorption of superhydrophobic nanosilica particles, Sci. Rep. 8, 7457 (2018) DOI: 10.1038/s41598-018-25850-6
[2017]	P. Gregorčič, B. Šetina-Batič, M. Hočevar, Controlling the stainless steel surface wettability by nanosecond direct laser texturing at high fluences, Appl. Phys. A 123, 766 (2017) DOI: 10.1007/s00339-017-1392-5
+	M. Zupančič, M. Može, P. Gregorčič, A. Sitar, I. Golobič, Evaluation of enhanced nucleate boiling performance through wall-temperature distributions on PDMS-silica coated and non-coated laser textured stainless steel surfaces, Int. J. Heat. Mass. Tran. 111, 419 (2017) DOI: 10.1016/j.ijheatmasstransfer.2017.03.128
+	U. Trdan, M. Hočevar, P. Gregorčič, Transition from superhydrophilic to superhydrophobic state of laser textured stainless steel surface and its effect on corrosion resistance, Corros. Sci. 123, 21 (2017) DOI: 10.1016/j.corsci.2017.04.005
+	M. Sedlaček, P. Gregorčič, B. Podgornik, Use of the Roughness Parameters Ssk and Sku to Control Friction—A Method for Designing Surface Texturing, Tribol. T. 60, 260 (2017) DOI: 10.1080/10402004.2016.1159358
+	M. Feinaeugle, P. Gregorčič, D. J. Heath, B. Mills, R. W. Eason, Time-resolved imaging of flyer dynamics for femtosecond laser-induced backward transfer of solid polymer thin films, Appl. Surf. Sci. 396, 1231 (2017) DOI: 10.1016/j.apsusc.2016.11.120
+	M. Zupančič, M. Može, P. Gregorčič, I. Golobič, Nanosecond laser texturing of uniformly and non-uniformly wettable micro structured metal surfaces for enhanced boiling heat transfer, Appl. Surf. Sci. 399, 480 (2017) DOI: 10.1016/j.apsusc.2016.12.120
[2016]	P. Gregorčič, N. Lukač, J. Možina, M. Jezeršek, Synchronized delivery of Er:YAG-laser pulses into water studied by a laser beam transmission probe for enhanced endodontic treatment, Appl. Phys. A 122, 459 (2016) DOI: 10.1007/s00339-016-9970-5
+	G. Hawlina, B. Drnovšek-Olup, J. Možina, P. Gregorčič, Photodisruption of a thin membrane near a solid boundary: an in vitro study of laser capsulotomy, Appl. Phys. A 122, 118 (2016) DOI: 10.1007/s00339-016-9648-z
+	M. S. Rabasović, D. Šević, N. Lukač, M. Jezeršek, J. Možina, P. Gregorčič, Evaluation of laser-induced thin-layer removal by using shadowgraphy and laser-induced breakdown spectroscopy, Appl. Phys. A 122, 186 (2016) DOI: 10.1007/s00339-016-9697-3
+	N. Lukač, P. Gregorčič, M. Jezeršek, Optodynamic Phenomena During Laser-Activated Irrigation Within Root Canals, Int. J. Thermophys. 37, 66  (2016) DOI: 10.1007/s10765-016-2071-z
+	P. Gregorčič, N. Lukač, J. Možina, M. Jezeršek, Synchronized delivery of Er:YAG-laser pulses into water studied by a laser beam transmission probe for enhanced endodontic treatment, Appl. Phys. A 122, 459 (2016) DOI: 10.1007/s00339-016-9970-5
+	A. Matsumoto, A. Tamura, A. Kawasaki, T. Honda, P. Gregorčič, N. Nishi, K. Amano, K. Fukami, and T. Sakka, Comparison of the overall temporal behavior of the bubbles produced by short- and long-pulse nanosecond laser ablations in water using a laser-beam-transmission probe, Appl. Phys. A 122, 234 (2016) DOI: 10.1007/s00339-016-9755-x
+	N. Lukač, J. Zadravec, P. Gregorčič, M. Lukač, M. Jezeršek, Wavelength dependence of photon-induced photoacoustic streaming technique for root canal irrigation, J. Biomed. Opt. 21, 075007 (2016) DOI: 10.1117/1.JBO.21.7.075007
+	P. Gregorčič, N. Lukač, J. Možina, M. Jezeršek, In vitro study of the erbium:yttrium aluminum garnet laser cleaning of root canal by the use of shadow photography, J. Biomed. Opt. 21, 015008 (2016) DOI: 10.1117/1.JBO.21.1.015008
+	P. Gregorčič, M. Sedlaček, B. Podgornik, J. Reif, Formation of laser-induced periodic surface structures (LIPSS) on tool steel by multiple picosecond laser pulses of different polarizations, Appl. Surf. Sci. 387, 698 (2016) DOI: 10.1016/j.apsusc.2016.06.174
[2015]	M. Zupančič, M. Steinbücher, P. Gregorčič, I. Golobič, Enhanced pool-boiling heat transfer on laser-made hydrophobic-superhydrophilic polydimethysiloxane-silica patterned surfaces, Appl. Therm. Eng. 91, 288 (2015) DOI: 10.1016/j.applthermaleng.2015.08.026
+	J. Pribošek, P. Gregorčič, J. Diaci, Automating shockwave segmentation in low-contrast coherent shadowgraphy, Mach. Vision Appl. 26, 485 (2015) DOI: 10.1007/s00138-015-0683-0
[2014]	G. Hawlina, D. Perovšek, B. Drnovšek-Olup, J. Možina, P. Gregorčič, Optical coherence tomography for an in-vivo study of posterior-capsule-opacification types and their influence on the total-pulse energy required for Nd:YAG capsulotomy: a case series, Bmc Ophthalmol. 14, 131 (2014) DOI: 10.1186/1471-2415-14-131
+	D. Vegelj, B. Zajec, P. Gregorčič, J. Možina, Adaptive Pulsed-Laser Welding of Electrical Laminations, Strojniški Vestnik-J. Mech. Eng. 60, 106 (2014) DOI: 10.5545/sv-jme.2013.1407
+	P. Gregorčič, J. Zadravec, J. Možina, M. Jezeršek, Optodynamic energy conversion efficiency during laser ablation on metal surfaces measured by shadow photography, Appl. Phys. A 117, 353 (2014) DOI: 10.1007/s00339-014-8412-5
[2013]	T. Požar, P. Gregorčič, J. Možina, Interferometric determination of the high-intensity laser-pulse-material interaction site, Appl. Phys. A 112, 165 (2013) DOI: 10.1007/s00339-012-7229-3
+	P. Gregorčič, J. Diaci, J. Možina, Two-dimensional measurements of laser-induced breakdown in air by high-speed two-frame shadowgraphy, Appl. Phys. A 112, 49 (2013) DOI: 10.1007/s00339-012-7173-2
+	B. Cencič, P. Gregorčič, J. Možina, M. Jezeršek, Laser tattoo removal as an ablation process monitored by acoustical and optical methods, Appl. Phys. A 112, 65 (2013) DOI: 10.1007/s00339-012-7203-0
+	T. Požar, P. Gregorčič, J. Možina, Interferometric determination of the high-intensity laser-pulse-material interaction site, Appl. Phys. A 112, 165 (2013) DOI: 10.1007/s00339-012-7229-3
[2012]	P. Gregorčič, M. Jezeršek, J. Možina, Optodynamic energy-conversion efficiency during an Er:YAG-laser-pulse delivery into a liquid through different fiber-tip geometries, J. Biomed. Opt. 17, 075006 (2012) DOI: 10.1117/1.JBO.17.7.075006
[2011]	T. Požar, P. Gregorčič, J. Možina, A precise and wide-dynamic-range displacement-measuring homodyne quadrature laser interferometer, Appl. Phys. B 105, 575 (2011) DOI: 10.1007/s00340-011-4512-5
+	P. Gregorčič, J. Možina, High-speed two-frame shadowgraphy for velocity measurements of laser-induced plasma and shock-wave evolution, Opt. Lett. 36, 2782 (2011) DOI: 10.1364/OL.36.002782
+	T. Požar, P. Gregorčič, J. Možina, Optimization of displacement-measuring quadrature interferometers considering the real properties of optical components, Appl. Optics 50, 1210 (2011) DOI: 10.1364/AO.50.001210
+	P. Gregorčič, A. Babnik, J. Možina, Variable high-energy-laser attenuator based on the interference on a transparent plate, Appl. Phys. B 105, 607 (2011) DOI: 10.1007/s00340-011-4500-9
[2010]	P. Gregorčič, T. Požar, J. Možina, Phase-shift error in quadrature-detection-based interferometers, Proc. SPIE 7726, 77260X (2010) DOI: 10.1117/12.854759
+	P. Gregorčič, A. Babnik, J. Možina, Interference effects at a dielectric plate applied as a high-power-laser attenuator, Opt. Express 18, 3871(2010) DOI: 10.1364/OE.18.003871
[2009]	T. Požar, P. Gregorčič, J. Možina, Optical measurements of the laser-induced ultrasonic waves on moving objects, Opt. Express 17, 22906 (2009) DOI: 10.1364/OE.17.022906
+	P. Gregorčič, T. Požar, J. Možina, Quadrature phase-shift error analysis using a homodyne laser interferometer, Opt. Express 17, 16322 (2009) DOI: 10.1364/OE.17.016322
[2008]	P. Gregorčič, R. Petkovšek, J. Možina, G. Močnik, Measurements of cavitation bubble dynamics based on a beam-deflection probe, Appl. Phys. A 93, 901 (2008) DOI: 10.1007/s00339-008-4751-4
[2007]	P. Gregorčič, J. Možina, Optodynamic characterization of laser-induced bubbles, Act. Phys. Pol. A 112, 1137 (2007) DOI: 10.12693/APhysPolA.112.1137
+	P. Gregorčič, R. Petkovšek, J. Možina, Investigation of a cavitation bubble between a rigid boundary and a free surface, J. Appl. Phys. 102, 094904 (2007) DOI: 10.1063/1.2805645
+	R. Petkovšek, P. Gregorčič, A laser probe measurement of cavitation bubble dynamics improved by shock wave detection and compared to shadow photography, J. Appl. Phys. 102, 044909 (2007) DOI: 10.1063/1.2774000
+	R. Petkovšek, P. Gregorčič, J. Možina, A beam-deflection probe as a method for optodynamic measurements of cavitation bubble oscillations, Meas. Sci. Technol. 18, 2972 (2007) DOI: 10.1088/0957-0233/18/9/030

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Patents

+	N. Lukač, M. Lukač, M. Jezeršek, P. Gregorčič, Cleaning system, EP3127502 (B1), filed: 3.8.2015, granted: 20.3.2019
+	A. Vrečko, B. Vedlin, J. Jakiša, P. Gregorčič, Ophthalmic laser device, EP3068355 (B1), filed: 11.11.2013, granted: 11.10.2017

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Invited Lectures

2019:	M. Senegačnik, M. Hočevar, B. Šetina Batič, P. Gregorčič: Laser-induced periodic surface structures: Characteristics of oxide layer after ns and ps laser texturing [Keynote talk], 9th International LIPSS Workshop, Ljubljana, Slovenia
2018:	P. Gregorčič: Laser Surface Engineering: An Approach by Nanosecond-Laser Texturing [Invited lecture], Kyoto Unversity, Kyoto, Japan
2018:	P. Gregorčič: Surface engineering by using nanosecond laser pulses [Invited lecture], Ruhr-Universität Bochum, Bochum, Germany
2018:	P. Gregorčič: Surface engineering by a nanosecond laser texturing [Invited lecture], Departement de Física Aplicada, Universitat de Barcelona, Barcelona, Spain
2017:	P. Gregorčič: Laser texturing – a flexible and efficient tool for producing surfaces with superior wetting properties [Invited talk], 25th International Conference on Materials and Technology, Portotož, Slovenia
2017:	Č. Donik, A. Kocjan, I. Paulin, M. Hočevar, P. Gregorčič, M. Godec: The new approach in surface preparation of the biodegradable FeMn alloys [Invited talk], 25th International Conference on Materials and Technology, Portotož, Slovenia
2017:	M. Zupančič, P. Gregorčič, I. Golobič: Scalable microstructuring for controlled heat and mass transfer [Keynote talk], 7th international LIPPS Workshop, Cottbus, Germany
2015:	P. Gregorčič, M. Jezeršek, J. Možina: Optodynamics in medical laser applications [Invited talk], LAMP2015, Kitakyushu, Japan
2013:	P. Gregorčič, J. Možina: Recent non-contact observations of optodynamic phenomena in medicine [Invited talk], Faculty for physics, Belgrade, Serbia

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Professional Associations

+	Photonics 21: WG2: Industrial Manufacturing and Quality, member (2014– )
+	Photonics 21: WG3: Life Science and Health, member (2014– )
+	ACS (American Chemical Society), member
+	OSA (The Optical Society of America), member
+	SPIE (The international society for optics and photonics), member
+	Mechanical Engineering World, member of the editorial board (2015– )
+	Photonics & Lasers in Medicine, member of the editorial board (2013–2016)
+	Special Issue of Nanomaterials: “Laser Surface Functionalization on Nanomaterials“, guest editor (2020-2021)

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Awards

2018:	Recognition for outstanding achievements in the field of youth research activities in 2018, the City of Ljubljana
2018:	Golden recognition for supervising the winning research thesis within the field “Astronomy and Physics” titled Laser propulsion, 52nd meeting of young researchers in Slovenia, Association for Technical Culture of Slovenia
2014:	Jožef Stefan Golden Emblem for the most recognizable PhD thesis, Institute “Jožef Stefan”, Ljubljana, Slovenia
2012:	Recognition for quality publications, Faculty of Mechanical Engineering, University of Ljubljana
2011:	Award for the contribution to sustainable development in 2010, Slovene human resources development and scholarship fund, Ljubljana, Slovenia
2007:	Recognition of the Faculty of Mechanical Engineering for the successful presentation of scientific research in the international environment in 2007, Faculty of Mechanical Engineering, University of Ljubljana
2007:	Prešeren’s award, Faculty of Mathematics and Physics, University of Ljubljana

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Reviewer

+	ACS Omega
+	Adv. Mater. Sci. Eng.
+	AIP Advances
+	Applied Physics A
+	Applied Physics Letters
+	Applied Surface Science
+	Biomedical Optics Express
+	Carbon
+	Coatings
+	Colloids and Surfaces A
+	Experimental Thermal and Fluid Science
+	Journal of Applied Physics
+	Journal of Biomedical Optics
+	Journal of Physics D: Applied Physics
+	Materials and Technology
+	Measurement Science and Technology
+	Nanomaterials
+	Optical Materials Express
+	Optics and Lasers in Engineering
+	Optics & Laser Technology
+	Optics Express
+	Optics Letters
+	Review of Scientific Instruments
+	Sensors
+	Surface and Coatings Technology

Youtube Channel: SurfaceApps

+	P. Gregorčič, The pulse energy: a combination of an average power and a repetition rate, lectures on YouTube, 2019
+	P. Gregorčič, M. Senegačnik, Surface coloration by laser-induced periodic surface structures (LIPSS), lectures on YouTube, 2019

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Page updated: October 08, 2021