Division Leader
Materials Science Division
Email: ibo@llnl.gov
Phone: +19254246762


  • Ph.D., Physics, Massachusetts Institute of Technology, 1998
  • B.S., Applied Physics, University of California Davis, 1993

Research Interests

My research interests include laser materials processing, laser-matter interaction science, process optimization of advanced manufacturing and high-speed in situ characterization methods.

Selected Publications

  1. R. Shi, S. A. Khairallah, T. T. Roehling, T. W. Heo, J. T. McKeown, and M. J. Matthews, "Microstructural control in metal laser powder bed fusion additive manufacturing using laser beam shaping strategy," Acta Materialia, 184, 284, 2020.
  2. 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, and W. E. King, "Controlling interdependent meso-nanosecond dynamics and defect generation in metal 3D printing," Science, 368, 660, 2020.
  3. B. Vrancken, R. K. Ganeriwala, and M. J. Matthews, "Analysis of laser-induced microcracking in tungsten under additive manufacturing conditions: Experiment and simulation," Acta Materialia, 194, 464, 2020.
  4. C. L. Druzgalski, A. Ashby, G. Guss, W. E. King, T. T. Roehling, and M. J. Matthews, "Process optimization of complex geometries using feed forward control for laser powder bed fusion additive manufacturing," Additive Manufacturing, 34, 101169, 2020.
  5. 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, and M. J. Matthews, "Dynamics of pore formation during laser powder bed fusion additive manufacturing," Nature Communications, 10, 1987, 2019.
  6. (Cover Article) N. J. Ray, J. H. Yoo, J. T. McKeown, S. Elhadj, S. H. Baxamusa, M. A. Johnson, H. T. Nguyen, W. A. Steele, J. M. Chesser, M. J. Matthews, and E. Feigenbaum, "Enhanced Tunability of Gold Nanoparticle Size, Spacing, and Shape for Large-Scale Plasmonic Arrays," ACS Applied Nano Materials, 2, 4395, 2019
  7. 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, and T. Zhu, "Additively manufactured hierarchical stainless steels with high strength and ductility," Nature Materials, 17, 63, 2018.
  8. T. T. Roehling et al., "Modulating laser intensity profile ellipticity for microstructural control during metal additive manufacturing," Acta Materialia, 128, 197, 2017.
  9. M. J. Matthews, G. Guss, S. A. Khairallah, A. M. Rubenchik, P. J. Depond, and W. E. King, “Denudation of metal powder layers in laser powder bed fusion processes,” Acta Materialia 114, 33, 2016.
  10. (Cover Article) C. A. R. Chapman, L. Wang, J. Biener, E. Seker, M. M. Biener, and M. J. Matthews, “Engineering on-chip nanoporous gold material libraries via precision photothermal treatment,” Nanoscale 8, 785, 2016.
  11. (Cover Article) M. J. Matthews, S. T. Yang, N. Shen, S. Elhadj, R. N. Raman, G. Guss, et al., “Micro-Shaping, Polishing, and Damage Repair of Fused Silica Surfaces Using Focused Infrared Laser  Beams,” Advanced Engineering Materials 17, 247, 2015.
  12. M. J. Matthews, N. Shen, J. Honig, J. D. Bude, and A. M. Rubenchik, “Phase modulation and morphological evolution associated with surface-bound particle ablation,” JOSA B 30, 3233, 2013.
  13. M. J. Matthews, G. Petitpas, and S. M. Aceves, “A study of spin isomer conversion kinetics in supercritical fluid hydrogen for cryogenic fuel storage technologies,” Applied Physics Letters 99, 081906, 2011.
  14. M. J. Matthews, J. Hsu, S. Gu, and T. Kuech, “Carrier density imaging of lateral epitaxially overgrown GaN using scanning confocal Raman microscopy,” Applied Physics Letters 79, 3086, 2001.
  15. M. Matthews, M. Pimenta, G. Dresselhaus, M. Dresselhaus, and M. Endo, “Origin of dispersive effects of the Raman D band in carbon materials,” Physical Review B 59, R6585, 1999.

Selected Patents

  • A. M. Rubenchik, M. J. Matthews, J. Trapp, “Compact absorptivity measurement system for additive manufacturing” U.S. Patent 10,646,960 issued May 12, 2020
  • N. P. Calta, G. Guss, M. J. Matthews, “System and method for portable multi-band black body simulator” U.S. Patent 10,564,039 issued February 18, 2020
  • M. J. Matthews, E. Duoss, “In situ monitoring of direct ink write process using electromagnetic resonant coupling” U.S. Patent 10,500,835 issued December 19, 2019
  • J. J. Adams, M. Bolourchi, J. D. Bude, G. M. Guss, J. A. Jarboe, M. J. Matthews, M. C. Nostrand, and P. J. Wegner “System and method for laser-based, non-evaporative repair of damage sites in the surfaces of fused silica optics,” U.S. Patent 9,434,645, issued September 6, 2016.
  • H.K. Chow, M.J. Matthews, D. Suvakovic, and D. Van Veen, “Methods and apparatus for achieving multiple bit rates in passive optical networks,” U.S. Patent 8,712,243, issued April 29, 2014.
  • M.J. Matthews and C. Xu, “Modulation Phase Shift To Compensate For Optical Passband,” U.S. Patent 7,403,718, issued July 22, 2008.
  • M.J. Matthews, “Short haul optical communications,” U.S. Patent 7,212,746, issued May 1, 2007.
  • G.M. Boles, A.E. Dunlop, I. Hadzic, M.J. Matthews, D. Suvakovic, and D. Van Veen, “Clock, Data And Time Recovery Using Bit-Resolved Timing Registers,” U.S. Patent 7,123,675, issued October 17, 2006.
  • G.M. Boles, I. Hadzic, M.J. Matthews, D. Suvakovic, and D. Van Veen, “Method And Apparatus For Multiphase, Fast-Locking Clock And Data Recovery,” U.S. Patent 7,242,739, issued July 10, 2007.