David A. Willis, Ph.D.

Associate Professor

Department of Mechanical Engineering

Southern Methodist University

 ARCHIVAL JOURNAL PUBLICATIONS:

Porneala, C. and Willis, D.A., 2009, “Time-Resolved Dynamics of Nanosecond Laser-Induced Phase Explosion,” Journal of Physics D: Applied Physics, Vol. 42, article 155503.

Willis, D.A. and Dreier, A. L., 2009, “Laser Micromachining of Indium Tin Oxide Films on Polymer Substrates by Laser-Induced Delamination,” Journal of Physics D: Applied Physics, Vol. 42, article 045306.

Willis, D.A. and Grosu, V., 2007, “The Effect of Melting-Induced Volumetric Expansion on Initiation of Laser-Induced Forward Transfer,” Applied Surface Science, Vol. 253, pp. 4759-4763.

Porneala, C. and Willis, D.A., 2006, “Observation of Nanosecond Laser-Induced Phase Explosion in Aluminum,” Applied Physics Letters, Vol. 89(21), article number 211121, republished in the Virtual Journal of Nanoscale Science and Technology, December, 2003, Vol. 14(23).

Ajaev, V.S. and Willis, D.A., 2006, “Heat Transfer, Phase Change, and Thermocapillary Flow in Films of Molten Metal on a Substrate,” Numerical Heat Transfer: Part A, Vol. 50(4), pp. 301-313.

Porneala, C. and Willis, D.A., 2006, “Effect of the Dielectric Transition on Laser-Induced Phase Explosion in Metals,” International Journal of Heat and Mass Transfer, Vol. 49(11-12), pp. 1928-1936.

Willis, D.A. and Grosu, V., 2005, “Microdroplet Deposition by Laser-Induced Forward Transfer,” Applied Physics Letters, Vol. 86(24), article number 244103.

Ajaev, V.S. and Willis, D.A., 2003, “Thermocapillary Flow and Rupture in Films of Molten Metal on a Substrate,” Physics of Fluids, Vol. 15(10), pp. 3144-3150.

Willis, D.A. and Xu, X., 2002, “In-Situ Photography of Picosecond Laser Ablation of Nickel,” Applied Surface Science, Vol. 197-198, pp. 118-123.

Willis, D.A. and Xu, X., 2002, “Heat Transfer and Phase Change during Picosecond Laser Ablation of Nickel,” International Journal of Heat and Mass Transfer, Vol. 45, pp. 3911-3918.

Xu, X. and Willis, D. A., 2002, “Non-Equilibrium Phase Change in Metal Induced by Nanosecond Pulsed Laser Irradiation,” Journal of Heat Transfer, Vol. 124, pp. 293-298.

Willis, D.A. and Xu, X., 2000, “Transport Phenomena and Droplet Formation During Pulsed Laser Interaction With Thin Films,” Journal of Heat Transfer, Vol. 122, pp. 763-770.

Willis, D.A., Xu, X., Poon, C.C., and Tam, A.C., 1998, “Laser-Assisted Surface Modification of Thin Chromium Films,” Optical Engineering, Vol. 37(3), pp. 1033-1041.

INVITED PRESENTATIONS:

Willis, D.A., Perkins, D.M. and Stegall, J.P., “Laser Direct-Write using Air-Drying Conductive Paste,” Proceedings of the 3rd Pacific International Conference on Applications of Lasers and Optics, PICALO 2008, Beijing, China.

Willis, D.A., “Nanosecond Imaging of Phase Change during Laser Microprocessing,” presented at University of Pittsburgh Department of Mechanical Engineering and Materials Science, March 27, 2007.

Willis, D.A., “Laser Microprocessing Research at SMU,” invited seminar, Raytheon Advanced Products Center, Dallas, TX, November 13, 2007.

Porneala, C. and Willis, D.A., 2007, “Time-resolved imaging of explosive phase change in metals,” presented at the Photonics West Conference, Proc. of the SPIE, Vol. 6458, paper # 645807.

Willis, D.A., “Laser Microprocessing Research at SMU,” invited seminar, UFT-PR, Brazil, November 2006

Willis., D.A., “Laser Microprocessing Research at SMU,” invited seminar, Unimep, Brazil, November 2006.

Willis, D.A., “Time-resolved imaging of laser-induced vaporization and phase explosion,” presented at the Southwest Research Institute, San Antonio, Texas, August 25, 2006.

Willis, D.A., “The role of liquid motion during nanosecond laser microprocessing,” presented to the University of North Texas College of Engineering, June 2006.

Willis, D.A., “Short-pulse laser microprocessing, applications, and research challenges,” presentation to the ASME North Texas Section Electronic Packaging Division, Feb. 7, 2006.

Willis, D.A.,  “Laser Microprocessing Research and Capabilities at Southern Methodist University,” presented at Lockheed Martin Missile and Fire Control, April 6, 2005.

Willis, D.A.,  “Microdroplet Deposition by Laser-Induced Forward Transfer,” Purdue University School of Mechanical Engineering Heat Transfer Seminar, Oct. 22, 2004.

Panelist, “Dual Career Couples,” Purdue University Women in Engineering panel discussion, Oct. 21, 2004.

Willis, D.A., “Laser Microprocessing Activities at Southern Methodist University,” presented at the Army Research Office, July 9, 2004.

PEER-REVIEWED CONFERENCE PROCEEDINGS:   

Klentzman, J., Ajaev, V.S., Willis, D.A., 2008, "Laser-induced melting and phase explosion in liquid metal films,” Proceedings of the Sixth International ASME Conference on Nanochannels, Microchannels and Minichannels, paper 62233

Willis, D.A., Krueger, P.S., and Kendrick, A., “The influence of a hands-on Research Experience on Undergraduates Students’ Perceptions of Engineering Research,” accepted to be presented at and appear in Proceedings of the ASEE 2008 Annual Conference and Exposition.

Christensen, M.P., Willis, D.A., and Douglas, S., “A Modular Approach to Combining First-Year Design Experiences across Engineering Disciplines,” Proceedings of the ASEE 2006 Conference.

Ajaev, V.S. and Willis, D.A., 2006, Modeling of Laser-Induced Material Removal during Fabrication of Micro- and Nanochannels,” to appear in Proceedings of the 4th International Conference on Nanochannels, Microchannels, and Minichannels.

Willis, D.A., 2005, "Laser Surface Texturing: Applications and Research Opportunities," Proceedings of the ASME Heat Transfer Summer Conference, paper #05-72676.

Porneala, C. and Willis, D.A., 2004, “The metal-dielectric transition in short-pulse laser ablation of metals” Proceedings of the ASME Heat Transfer/Fluids Engineering Summer Conference, HTFED2004, paper #04-56645.

Willis, D.A. and Xu, X., 1998, “Transport Phenomena and Droplet Formation During Pulsed Laser Micro-Machining of Thin Films,” presented at the ASME International Mechanical Engineering Congress and Exposition, Anaheim, CA. Published in HTD-Vol. 361-4, pp. 173-181. (Presented by D.A. Willis)

Kopsombut, P.L., Willis, D., Schen, A. E., Xu, L. X., and Xu, X., 2000, “Measurement of the Optical Properties of Muscle Tissue In Vivo,” Proceedings of the ASME, HTD-Vol. 368, pp 5-8, presented by L.X. Xu).

OTHER CONFERENCE PRESENTATIONS & PROCEEDINGS: 

Hendijanifard, M. and Willis, D.A., 2008, “Phase Explosion and Marangoni Flow Effects during Laser Micromachining of Thin Metal Films,” Proceedings of the SPIE, Vol. 6879 (presented at Photonics West conference, January 2008).

Christensen, M.P. and Willis, D.A., 2005, “Hands-on Interdepartmental Engineering Design Projects for First-Year Students,” presented  to the Conference on Information Technology, Dallas, TX.

Willis, D.A. and Grosu, V.  2005, “Microdroplet Deposition by Laser-Induced Forward Transfer,” Proceedings of the SPIE, Vol. 5713, pp. 90-96.

Porneala, C. and Willis, D.A., 2004, “Numerical Simulation of Dielectric Transition during Laser Ablation,” Proceedings of the Micro- and Nanoscale Laser Materials Processing Symposium, 41^st Annual Technical Meeting of the Society of Engineering Science.

Grosu, V. and Willis, D.A., 2004, “Microdroplet Deposition by Laser-Induced Forward Transfer,” Proceedings of the Micro- and Nanoscale Laser Materials Processing Symposium, 41^st Annual Technical Meeting of the Society of Engineering Science.

Willis, D.A., 2004, “Thermal Mechanisms of Laser Micromachining of Indium Tin Oxide,” Proceedings of the SPIE, Vol. 5339, pp. 313-320, presented by D.A. Willis.

Willis, D.A. and V. Grosu, 2004, “Evaporation and phase explosion during laser-induced forward transfer of aluminum,” Proceedings of the SPIE, Vol. 5339, pp 304-312, presented by D.A. Willis.

Willis, D.A., 2003, “Pulsed Laser Micromachining of Indium Tin Oxide on Polymer Substrates,” presented at the Laser Microfabrication Conference, International Congress on Applications of Lasers and Electro-Optics, Jacksonville, FL, 2003. Published in the Proceedings of the Laser Microfabrication Conference, ICALEO 2003, LIA, presented by D.A Willis.

Ajaev, V.S. and Willis, D.A., 2003, “Thermocapillary Flow in Thin Films of Molten Metal,” APS Annual Meeting, Austin, TX, presented by D.A. Willis.

Ajaev, V.S. and Willis, D.A., 2002, “Long-scale Evolution of Thin Films of Molten Metal on a Substrate,” Symposium on Mechanics of Liquid-Gas and Liquid-Solid Interfaces, Proceedings of the 14^th International Congress on Applied Mechanics, June 23-28, p. 208. Presented by V.S. Ajaev. 

Ajaev, V.S. and Willis, D.A., 2002, “A Thin-Film Model for Flow of Molten Metal on a Substrate during Pulsed Laser Micromachining,” Presented at the Laser Microfabrication Conference, International Congress on Applications of Lasers and Electro-Optics, Scottsdale, AZ, 2002. Published in the Proceedings of the Laser Microfabrication Conference, ICALEO 2002, LIA, presented by D.A. Willis.

Willis, D.A. and Xu, X., 2001, “Thermal Mechanisms of Subnanosecond Ablation,” in Laser Applications in Microelectronic and Optoelectronic Manufacturing VI, Proceedings of the SPIE, Vol. 4274, pp. 240-247, presented by X. Xu.

Willis, D.A. and Xu, X., 2000, “Fundamental Study of Picosecond Laser Ablation,” presented at the Laser Microfabrication Conference, International Congress on Applications of Lasers and Electro-Optics, Dearborn, MI, 2000. Published in Proceedings of the Laser Microfabrication Conference, ICALEO 2000, LIA Volume 90, pp. A36-A43, presented by D.A. Willis.

Xu, X., Ryu, J.W., and Willis, D.A., 1999, “Pulsed Laser Machining of Thin Films for Microsensor Development,” Proceedings of the International Congress on Applications of Lasers and Electro-Optics, Vol. 88, Laser Microfabrication, pp. 160-166, presented by D.A. Willis.

Willis, D.A., Xu, X., Poon, C.C., and Tam, A.C., 1997, “Laser-Assisted Surface Modification of Thin Chromium Films,” Proceedings of the SPIE, Vol. 2991, pp. 29-38, presented by D.A. Willis.

Willis, D.A., Xu, X., Poon, C.C., and Tam, A.C., 1997, “Mechanism of Droplet Formation in Laser-Assisted Micromachining,” Proceedings of the International Congress on Applications of Lasers and Electro-Optics, pp. 71-80, presented by X. Xu.

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