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Douglas Christensen

Current Research

For additional information, including recent teaching assignments, patents and conference presentations, please visit my HOME PAGE.

Current research projects include:

Modeling of Therapeutic Ultrasound: Ultrasound can be used as an energy delivery means. It has found use as a drug-delivery modality, in bone healing, and in tissue heating and ablation. To model the path of the ultrasound beam in imhomogeneous tissue, we have developed a numerical technique called the fast hybrid angular spectrum method (HAS). This project is in collaboration with Profs. Bob Roemer, Dennis Parker and Mikhail Skliar.

Below are some selected additional publications that are not listed in the PubMed "Selected Publications" collection (at the very bottom of this page):

-J. D. Andrade, J. N. Lin, V. Hlady, J. Herron, D. A. Christensen, and J. Kopecek, "Immunosensors: Remaining Problems in the Development of Remote, Continuous, Multi-Channel Devices," Biosensor Technology, R. B. Buck, et al., eds., Dekker, 1990.
-J.N. Lin, I.N. Chang, J.D. Andrade, J.N. Herron, and D.A. Christensen, "Comparison of Site-Specific Coupling Chemistry for Antibody Immobilization on Different Solid Supports," Journal of Chromatography, Vol. 542, pp. 41-54, 1991.
-W. Sui, D.A. Christensen, and C.H. Durney, "Extending the Two-Dimensional FDTD Method to Hybrid Electromagnetic Systems with Active and Passive Lumped Elements," IEEE Transactions on Microwave Theory and Techniques, Vol. 40, pp. 724-730, April 1992.
-R.B. Gwynn and D.A. Christensen, "A Method for Accurate Optical Alignment Using Diffraction Rings from Lenses with Spherical Aberration," Applied Optics, Vol. 32, No. 7, pp. 1210-1215, March 1993.
-D.A. Christensen, J. Rotge, A. Klemas, G. Loos, and D. Merriman, "Laser Diode Coherence Length Variation for Balancing Fiber Optic Interferometers,” Optical Engineering, Vol. 33, No. 6, pp. 2034-2038, June 1994.
-D.A. Christensen, T. Johansson, and D. Petelenz, "Biosensor Development at the University of Utah," Engineering in Medicine and Biology, Vol. 13, No. 3, pp. 388-395, June/July 1994.
-D.A. Christensen, "Analysis of Near Field Tip Patterns Including Object Interaction Using Finite-Difference Time-Domain Calculations," Ultramicroscopy, Vol. 57, Nos. 2/3, pp. 189-195, February 1995.
-D.N. Buechler, D. H. Roper, C. H. Durney, and D. A. Christensen, "Modeling Sources in the FDTD Formulation and Their Use in Quantifying Source and Boundary Condition Errors," IEEE Transactions on Microwave Theory and Techniques, Vol. 43, No. 4, pp. 810-814, April 1995.
-T.E. Plowman, W. M. Reichert, C. R. Peters, H. K. Wang, D. A. Christensen, and J. N. Herron, "Femtomolar Sensitivity Using a Channel-etched Thin Film Waveguide Fluoroimmunosensor," Biosensors and Bioelectronics, Vol. 11, No. 1/2, pp. 149-160, 1996.
-C.H. Durney, W. Sui, D. A. Christensen, and J. Zhu, "A General Formulation for Connecting Sources and Passive Lumped-Circuit Elements Across Multiple 3-D FDTD Cells," IEEE Microwave and Guided Wave Letters, Vol. 6, No. 2, pp. 85-87, February 1996.
-D.A. Christensen and D. Fowers, "Modeling SPR Sensors with the Finite-Difference Time-Domain Method," Biosensors and Bioelectronics, Vol. 11, No. 6/7, pp. 677-684, 1996.
-S.D. Dyer and D.A. Christensen, "Dispersion Effects in Fiber Optic Interferometry," Optical Engineering, vol. 36, no. 9, pp. 2440-2447, September 1997.
-T.E. Plowman, J.D. Durtschi, H-K Wang, D.A. Christensen, J.N. Herron and W.M. Reichert, “Multiple-analyte Fluoroimmunoassay using an Integrated Optical Waveguide Sensor,” Analytical Chemistry, vol. 71, pp. 4344-4352, 1999.
-C.M. Furse, D.H. Roper, D.N. Buechler, D.A. Christensen, and C.H. Durney, "The Problem and Treatment of DC Offsets in FDTD Simulations," IEEE Transactions on Antennas and Propagation, vol. 48, pp. 1198-1201, August 2000.
-D.N. Buechler, D.A. Christensen, C.H. Durney and B.J. Simon, “Calculation of Electric Fields in the Human Knee Produced by a Knee-Thigh Electrode Pair,” Applied Computational Electromagneti