David A. Willis, Ph.D.

Associate Professor

Department of Mechanical Engineering

Southern Methodist University

 ARCHIVAL JOURNAL PUBLICATIONS:

V.Q. Do, E.R. Reale, I.C Loud, P.G. Rozzi, H. Tan, D.A. Willis, and K.C. Smith, 2023, “Interdigitated microchannels embedded in intercalation electrodes enable seawater desalination and beyond,” Energy and Environmental Science, Vol. 16, pp. 3025-3039.

H. Bayat, P.S. Krueger, and D.A. Willis, 2023, "Analysis of fluid-structure interaction in a directional permeability membrane in pressure-driven flow," Engineering Research Express, Vol. 5, article 015020.

M. Hendijanifard and D.A. Willis, 2015, "Validity of the Taylor-Sedov Theory for Studying Laser-Induced Phase Explosion and Shock Waves," Journal of Nanoscience and Nanotechnology, Vol. 15(4), pp. 3249-3253.

M. Hendijanifard and D.A. Willis, 2013, “Nanosecond Time-Resolved Measurements of Transient Hole Opening during Laser Micromachining of an Aluminum Film,” Journal of Heat Transfer, Vol. 35(9), article 091201.

D.A. Willis, P.S. Krueger, A. Kendrick, 2013, “The Influence of a Research Experiences for Undergraduates Program on Student Perceptions and Desire to Attend Graduate School,” Journal of STEM Education, Vo. 14(2), pp. 21-28.

B. T. Least and D.A. Willis, 2013, “Modification of Polyimide Wetting Properties by Laser Ablated Conical Microstructures,” Applied Surface Science,” Vol. 273, pp. 1-11.

Hendijanifard, M. and Willis, D.A., 2011, “An Improved Method to Experimentally Determine Temperature and Pressure behind Laser-Induced Shock Waves at Low Mach Numbers,” Journal of Physics D: Applied Physics, Vol. 42, article 155503.

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 (selected for 2009 Journal of Physics D Highlights).

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.

BOOK CONTRIBUTIONS

D.A. Willis, 2018, “Laser-Induced Forward Transfer of Metals,” Laser Printing of Functional Materials: 3D Microfabrication, Electronics, and Biomedicine, Pere Serra and Alberto Pique, Editors, Wiley-VCH, pp. 149-174. 

D.A. Willis, 2014, “Stress Generation in Laser-Material Interaction: Phase Explosion Phenomena,” Encyclopedia of Thermal Stresses, Richard B. Hetnarski., Editor, Spring Publishing. Invited contribution.

INVITED PRESENTATIONS AND CONFERENCE PROCEEDINGS:

D.A. Willis, “Time-Resolved Imaging of Nanosecond Laser Ablation Processes,” Invited presentation, Department of Mechanical Engineering, presented at the University of Houston, Nov. 7, 2013.

 

M. Hendijanifard and D.A. Willis, 2013, “Time-Resolved Shock Wave Measurements for Studying Laser-Induced Phase Explosion,” presented at the 4th International Symposium on Micro and Nano Technology (ISMNT-4), Shanghai, China, October 2013 (Keynote presentation by D.A. Willis). 

M. Hendijanifard and D.A. Willis, 2012, “Recoil Pressure during Laser-induced Phase Explosion using Time-Resolved Shock Wave Measurements,” Proceedings of the 13th International Symposium on Laser Precision Microfabrication (presented by D.A. Willis).

D.A. Willis and M. Hendijanifard, 2012, “Nanosecond Time-Resolved Measurements of Hole Opening during Laser Micromachining of Aluminum Films,” 3rd ASME Micro/Nanoscale Heat and Mass Transfer International Conference, paper # MNHMT2012-75331 (presented by D.A. Willis).

D.A. Willis, 2010, “Time-Resolved Imaging of Material Removal during Nanosecond Laser Ablation,” presented at the University of North Texas, Department of  Mechanical and Energy Engineering, Dec. 9, 2010.

B.T. Least and D.A. Willis, 2010, “Laser texturing of polyimide for altering the contact angle of water” presented by D.A. Willis at the Society for Engineering Science 2010 Technical Meeting, Iowa State University.

B.T. Least and D.A. Willis, 2010, “Generation of Hydrophobic Cones on Polyimide by Nd:YLF Texturing,” presented at the 4th Pacific International Conference on Applications of Lasers and Optics, PICALO 2010, Wuhan, China. 

“Laser Microfabrication Research at SMU: Fundamentals and New Applications,” JPSA Laser Company Technical Seminar, Sept. 10, 2009.

Plenary Speaker, Teaching Effectiveness Symposium, sponsored by Southern Methodist University Center for Teaching Excellence, August 20, 2009.

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:   

 Y. Cui, H-Y. Chen, S. Chen, D. Linkhart, H. Tan, J. Wu, S. Yoon, M. Geiler, A. Geiler, E. Beam, A. Xie, N. Wang, M. Regan, M. Kruzich, B. Nguyen, D. White., A. Ketterson, C. Lee, D. Willis, H. Wang, and Y. Cao, 2021, “Monolithically Integrated Self-Biased Circulator for mmWave T/R MMIC Applications,” 67th IEEE International Electron Devices Meeting. 

H. Bayat, D.A. Willis, and P.S. Krueger, 2019, “Design and Performance of a Directional Permeability Membrane, Proceedings of the ASME 2019 International Mechanical Engineering Congress & Exposition, paper #11565.

B.F. Willis, D.A. Willis, and M. Fontenot, 2014, “Developing Leadership Skills and Creating Community in Engineering Students,” to appear in Proceedings of the ASEE 2014 Annual Conference and Exposition.

B.F. Willis, M. Fontenot, and D.A. Willis, 2013, “Towards IDEAL Engineers: Identifying and Developing Engineers as Leaders,” Proceedings of the 2013 First Year Engineering Experience (FYEE) Conference.   

D.A. Willis, P.S. Krueger, and A. Kendrick, 2010, “Perceptions, Expectations, and Outcomes of a Research Experiences for Undergraduates Program,” Proceedings of the ASEE 2010 Annual Conference and Exposition (presented by D.A. Willis). Honorable mention for Mechanical Engineering Division Best Paper competition.

M. Hendijanifard and D.A. Willis, 2009, “Modeling of Pressure Evolution during Nanosecond Laser Ablation of Metal Films,” Proceedings of the 2009 ASME Summer Heat Transfer Conference.

D.A. Willis, P.S. Krueger, and A. Kendrick, 2009, “The Influence of a Research Experiences for Undergraduates Program on Students’ Attitudes toward Engineering Research,” Proceedings of the ASEE 2009 Annual Conference and Exposition (presented by D.A. Willis).

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., 2008, “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: 

P Krueger, M Saari, H Tan, D Willis, 2022, "Effect of Slip Flow on Vortex Ring Formation," Bulletin of the American Physical Society.

Cui, Y., Beam, E., Yoon, S., Lee, C., Cao, Y., Linkhard, D., Burns, L., Geiler, M., Geiler, A., Tan, H., Willis, D. A., 2021, Ka-Band Self-Biased Circulators Integrated on GaN/SiC for T/R MMIC Applications., Government Microcircuit Applications and Technology (GOMACTech-21 conference). 

H. Tan, D.A. Willis, and P.S. Krueger, 2019, “Hydrophobicity enhancement by laser-assisted surface topography modification,” poster at The Bluebonnet Symposium on Thermal-Fluid Sciences, Dallas, TX May 2, 2019. 
M . Hendijanifard and D.A. Willis, 2009, “Measurement of Laser-Induced Mass Removal Using Shock Wave Imaging,” Proceedings of the 2009 Advanced Laser Applications Conference and Exposition.

B. Least and D.A. Willis, 2009, “Alteration of Polyimide Wetting Properties by Laser Texturing,” presented at and published in the Proceedings of the 5th International Congress on Laser Advanced Materials Processing (LAMP2009), Kobe, Japan (presented by D.A. Willis).

D.A. Willis, M. Fontenot, P.S. Krueger, and J.T. Yu, 2009, “Creating an Interactive Engineering and Computer Science Classroom using Tablet PCs,” poster presentation at Hewlett-Packard Teaching for Technology Higher Education Grantees Conference, Feb. 22 – 24, 2009, San Diego, CA (presented by D.A. Willis and P.S. Krueger).

D.A. Willis, P.S. Krueger, and A. Kendrick, “REU Site: Experimental Methods in Mechanical Engineering,” poster presentation at the National Science Foundation Engineering Education and Centers Conference, Feb. 1 – 3, 2009, Reston, VA (presented by D.A. Willis).

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, 41st 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, 41st 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 14th 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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