This page lists papers from older areas of research of interest to Prof. Federici
Bio-optics and Medical Imaging
The purpose of this work is to develope a non-invasive, in-situ imaging technique for measuring the stretch/ strain of biological and non-biological soft-tissues such as skin. In particular, the polarization imaging technique is a promising imaging method for measuring the biomechanical properties of soft-tissues. The following papers describe the technique and our results to date.
N. Guzelsu, J. F. Federici, H. C. Lim, H. R.Chauhdry, A. B.Ritter and T. Findley, "Measurement of Skin Stretch via Light Reflection", J. Biomedical Optics. 8, 80 (2003).
B. Schulkin, H. C. Lim, N. Guzelsu, G. Jannuzzi, and J. F. Federici, "Polarized Light Reflection from Strained Sinusiodal Surface", Applied Optics-OT 42, 5198 (2003).J. F. Federici and O. Mitrofanov, `Terahertz Near-Field Imaging', Physics in Medicine and Biology 47 3727-3734 (2002). N.Guzelsu, T.W. Findley, J. F. Federici, H.R.Chaudhry and A.B.Ritter " Apparatus and Method for Non-Invasive Measurement of Stretch," U.S.Patent 6,324,419 B1, November 27, 2001.
J. F. Federici, H. C. Lim, G. Jannuzzi, N. Guzelsu, T. Findley, A. Ritter, H. Chaudhry, "Non-Invasive Light Reflection Technique for Measuring Soft-Tissue Stretch" - Applied Optics 38, 6653 (1999)
This work has focussed mostly on understanding the physical mechanism of photoinduced superconductivity in YBa2Cu3O6+x. We have conducted photoconductivity, IR quenching, photoluminescence, and x-ray studies which suggest that a defect mediated mechanism is an appropriate description. The following papers describe the results:
J. F. Federici and D. M. Bubb, "The Role of Defects in Persistent Photoconductivity", J. Superconductivity 14, 331 (2001).
D. M. Bubb and J. F. Federici, Cellular Automata Model for Persistent Photoconductivity in YBCO, J. Physics - Condensed Matter 12, L261 (2000).
D. M. Bubb, J. F. Federici, W. Wilber, S. Tidrow, J. Kim, and A. Pique. "Wavelength and Photon Dose Dependence of Infrared Quenched Persistent Photoconductivity in YBa2Cu3O6+d ," Phys. Rev. B 60, 6827, 1999.
T. Tyson, J. F. Federici, D. Chew, A. R. Bishop, L. Furenlid, W. Savin, and W. Wilber, `Observation of local structural and electrical changes accompanying photodoping in YBa2Cu3O6+x,' Physica C 292, 163 (1997).
D. Chew, J. F. Federici, J. Gutierrez-Solana, G. Molina, W. Savin, and W. Wilber, `Infrared quenching of photoinduced persistent conductivity in YBa2Cu3O6+x', Appl. Phys. Lett. 69, 3260 (1996).
J. F. Federici, D. Chew, B. Welker, J. Gutierrez-Solana, W. Savin, T. Fink, and W. Wilber, `Defect mechanism of photoinduced superconductivity in YBCO', Phys. Rev. B 52, 15592 (1995).
Other Solid State Physics
G. A. Thomas, D. M. Bubb, T. Y. Koo, D. J. Werder, S. W. Cheong, and J. F. Federici, `Lighting Up Erbium with Water: Observation of Crystalline Matrix Element Enhancements', J. Applied Physics 90, (2001).
Integrated Optical Sensors
D. H. Luo, R. A. Levy, Y. F. Hor, J. F.Federici, and R. M. Pafchek, 'An Integrated Photonic Sensor for In-situ Monitoring of Hazardous Organics', Sensors and Actuators B 92, 121 (2003).
J. F. Federici, "Optical Science and Engineering Research and Education at NJIT", Presented at the SPIE EAST 2004 Conference, Photonics Programs in Regional Universities Forum. Wednesday 27 October.
B. Schulkin, L. Sztancsik, J. F. Federici, "Analytic Solution for 1 Dimension Photonic Band Gap Crystals", Amer. J. Phys. 72, 1 (2004).