Ibo Matthews

Portrait of  Ibo Matthews

  • Title
    Division Leader, Materials Science Division
  • Email
  • Phone
    (925) 424-6762
  • Organization
    Not Available

Dr. Manyalibo (“Ibo”) Matthews leads the Materials Science Division (MSD) at Lawrence Livermore National Laboratory (LLNL), where he oversees more than 500 staff. The division is organized into 18scientific capability groups, who together execute research projects representing more than $250M in annual investments to support LLNL missions. The division’s research includes energetic, optical, and quantum materials, as well as ceramics, actinides, and materials for energy applications and extreme environments. 

Prior to taking on the division leader role in 2021, Matthews served as a group leader in MSD, which is part of LLNL’s Physical and Life Sciences Directorate. He also served as a program group leader in LLNL’s National Ignition Facility and Photon Science Directorate, where he led a team of 40 staff charged with developing new methods in laser materials processing and studying laser-matter interactions in a variety of materials. His research interests include understanding and optimizing metal 3D printing processes, laser materials processing, high-power-laser damage mechanisms, laser-based nanoscale surface modification, vibrational spectroscopy, confocal microscopy, and in situ characterization of transient processes. His scientific work has been featured in three book chapters and more than 175 peer-reviewed publications with >11,000 citations, including more than a dozen journal covers. His technical contributions have also led to 20 U.S. patents.   

Matthews is a Fellow of the Optical Society of America (Optica) and a 2019 alum of the Frontiers of Engineering Program, sponsored by the National Academy of Engineering. In 2022 he was recognized as one of Electro Optic’s “Photonics100 innovators. He led an LLNL task force aimed at improving employee development opportunities at the Laboratory, and he continues to invest his time to develop mentorship programs and expand outreach to students at minority-serving institutions, inspiring the next generation to consider careers in science. 

Prior to joining LLNL in 2006, he was member of the technical staff at Bell Laboratories in Murray Hill, New Jersey, where he worked on advanced methods for optical materials characterization and led a research team in advanced broadband access networks. Matthews earned his Ph.D. in Physics from the Massachusetts Institute of Technology in experimental condensed matter physics, and his B.S. in Applied Physics from the University of California at Davis.   

Ph.D., Physics, Massachusetts Institute of Technology

B.S., Applied Physics, University of California, Davis

  1. J.R. Tempelman, A.J. Wachtor, E.B. Flynn, P.J. Depond, J.-B. Forien, G.M. Guss, N.P. Calta, M.J. Matthews, Detection of keyhole pore formations in laser powder-bed fusion using acoustic process monitoring measurements, Additive Manufacturing  (2022) 102735.
  2. T.U. Tumkur, T. Voisin, R.P. Shi, P.J. Depond, T.T. Roehling, S. Wu, M.F. Crumb, J.D. Roehling, G. Guss, S.A. Khairallah, M.J. Matthews, Nondiffractive beam shaping for enhanced optothermal control in metal additive manuf., Sci Adv 7(38) (2021). - COVER
  3. J. Berry, A. Perron, J.L. Fattebert, J.D. Roehling, B. Vrancken, T.T. Roehling, D.L. Rosas, J.A. Turner, S.A. Khairallah, J.T. McKeown, M.J. Matthews, Toward multiscale simulations of tailored microstructure formation in metal additive manufacturing, Mater Today 51 (2021) 65-86. - COVER
  4. S.A. Khairallah, A.A. Martin, J.R.I. Lee, G. Guss, N.P. Calta, J.A. Hammons, M.H. Nielsen, K. Chaput, E. Schwalbach, M.N. Shah, M.G. Chapman, T.M. Willey, A.M. Rubenchik, A.T. Anderson, Y.M. Wang, M.J. Matthews, W.E. King, Controlling interdependent meso-nanosecond dynamics and defect generation in metal 3D printing, Science 368(6491) (2020) 660-665.
  5. R. Shi, S.A. Khairallah, T.T. Roehling, T.W. Heo, J.T. McKeown, M.J. Matthews, Microstructural control in metal laser powder bed fusion additive manufacturing using laser beam shaping strategy, Acta Materialia 184 (2020) 284-305.
  6. B. Vrancken, R.K. Ganeriwala, M.J. Matthews, Analysis of laser-induced microcracking in tungsten under additive manufacturing conditions: Experiment and simulation, Acta Materialia 194 (2020) 464-472.
  7. A.A. Martin, N.P. Calta, S.A. Khairallah, J. Wang, P.J. Depond, A.Y. Fong, V. Thampy, G.M. Guss, A.M. Kiss, K.H. Stone, C.J. Tassone, J. Nelson Weker, M.F. Toney, T. van Buuren, M.J. Matthews, Dynamics of pore formation during laser powder bed fusion additive manufacturing, Nature Communications 10(1) (2019) 1987.
  8. Y.M. Wang, T. Voisin, J.T. McKeown, J. Ye, N.P. Calta, Z. Li, Z. Zeng, Y. Zhang, W. Chen, T.T. Roehling, R.T. Ott, M.K. Santala, Philip J. Depond, M.J. Matthews, A.V. Hamza, T. Zhu, Additively manufactured hierarchical stainless steels with high strength and ductility, Nature Materials  (2017) doi:10.1038/nmat5021.
  9. C.A.R. Chapman, L. Wang, J. Biener, E. Seker, M.M. Biener, M.J. Matthews, Engineering on-chip nanoporous gold material libraries via precision photothermal treatment, Nanoscale 8(2) (2016) 785-795. - COVER
  10. M.J. Matthews, G. Guss, S.A. Khairallah, A.M. Rubenchik, P.J. Depond, W.E. King, Denudation of metal powder layers in laser powder bed fusion processes, Acta Materialia 114 (2016) 33-42.
  11. M.J. Matthews, G. Petitpas, S.M. Aceves, A study of spin isomer conversion kinetics in supercritical fluid hydrogen for cryogenic fuel storage technologies, Applied Physics Letters 99(8) (2011) 081906.
  12. H. Akiyama, L.N. Pfeiffer, M. Yoshita, A. Pinczuk, P.B. Littlewood, K.W. West, M.J. Matthews, J. Wynn, Coulomb-correlated electron-hole plasma and gain in a quantum-wire laser of high uniformity, Physical Review B 67(4) (2003) 041302.
  13. M.J. Matthews, J. Hsu, S. Gu, T. Kuech, Carrier density imaging of lateral epitaxially overgrown GaN using scanning confocal Raman microscopy, Applied Physics Letters 79(19) (2001) 3086-3088.
  14. M. Matthews, M. Pimenta, G. Dresselhaus, M. Dresselhaus, M. Endo, Origin of dispersive effects of the Raman D band in carbon materials, Physical Review B 59(10) (1999) R6585.
  15. G.L. Frey, R. Tenne, M.J. Matthews, M. Dresselhaus, G. Dresselhaus, Raman and resonance Raman investigation of MoS2 nanoparticles, Physical Review B 60(4) (1999) 2883.
  16. M. Matthews, M. Dresselhaus, G. Dresselhaus, M. Endo, Y. Nishimura, T. Hiraoka, N. Tamaki, Magnetic alignment of mesophase pitchbased carbon fibers, Applied Physics Letters 69(3) (1996) 430-432.