Read about advances in THz technology including Professor Federici's contribution: SPIE Professional 2006 Article
Professor Federici has several active research programs in
Terahertz Spectroscopy and Imaging MacroElectronics biophotonics
Older Areas of Research: Photoinduced Superconductivity Photonics Education
Terahertz Technology and Spectroscopy
My research in THz Technology and Imaging covers a wide area of topics including: Synthetic Aperture Imaging, Detection of concealed weapons and explosives, THz waveguides, THz Technology, THz Sources/ Detectors/ Near-field Microscopy, solid state physics (nanotubes and other materials).
Synthetic Aperture Imaging, Detection of Concealed Weapons, Explosives, Homeland Security Applications
John F. Federici, Dale Gary, Robert Barat, Zoi-Helena Michalopoulou, ‘Detection of Explosives by Terahertz Imaging’, Chapter to appear in Counter-Terrorism Detection Techniques of Explosives Jehuda Yinon Ed.
A. M Sinyukov, A. Bandyopadhyay, A. Sengupta, R. B Barat, D. E Gary, Z. H. Michalopoulou, D. Zimdars, and J. F Federici, ‘Terahertz interferometric and synthetic aperture imaging, Inter. J. High Speed Electron. Systems. (accepted).
A. Bandyopadhyay, A. Sengupta, R. B. Barat, D. E. Gary, Z. Michalopoulou, and J. F. Federici, 'Interferometric THz Imaging for detection of lethal agents using artificial neural network analysis', Int. J. Infrared Millimeter Waves (accepted).
J. Federici, R. Barat, D. Gary, Z-H. Michalopoulou, and D. Zimdars, 'Stand-Off Sensing of Explosives Using Terahertz Radiation', (in press) American Laboratory
A. Sengupta, A. Bandyopadhyay, J. F. Federici, D. E. Gary, and R. B. Barat, “THz reflection spectroscopy of Composition C-4 and its detection through interferometric imaging,” Proc. SPIE 6120, 61200A (2006).
A. Bandyopadhyay, A. Sengupta, R. B. Barat, D. E. Gary, and J.F. Federici, “Grain size dependant scattering studies of common materials using THz time-domain techniques,” Proc. SPIE 6120, 61200H(2006).
A. Bandyopadhyay, A. Sengupta, V. Johnson, J. A. Harrington, and J. F. Federici, “Characterization of hollow polycarbonate waveguides using THz time-domain spectroscopy,” Proc. SPIE 6120, 61200B (2006).
A. Sinyukov, A. Bandyopadhyay, A. Sengupta, D. E. Gary, R. B. Barat, E. Michalopoulou, D. Zimdars, and J. F. Federici, 'Terahertz interferometric and synthetic aperture imaging', Proc. SPIE 6120, 62120Z (2006)
A. M Sinyukov, A. Bandyopadhyay, A. Sengupta, R. B Barat, D. E Gary, Z.-H. Michalopoulou, D. Zimdars, and J. F Federici, ‘Terahertz interferometric imaging of a concealed object’, SPIE Optics East, October 2006.
A. Sengupta, A. Bandyopadhyay, R. Barat, D. E Gary and J. F Federici, 'THz Reflection Spectroscopy of Composition C-4 and its detection through interferometric imaging', presented at the Optical Terahertz Science and Technology (OTST) 2005 conference Orlando, FL.
John F. Federici, Feng Huang, Aparajita Bandyopadhyay, Amartya Sengupta, Dale Gary. Robert Barat, and David Zimdars, 'THz Standoff Detection and Imaging of Explosives and Weapons', (INVITED PAPER), Proc. SPIE 5781, 75 (2005).
John F. Federici, Feng Huang, Dale Gary, Robert Barat, David Zimdars, 'THz Imaging using an Interferometric Array', Proc. SPIE 5790, 11 (2005).
John F. Federici, Brian Schulkin, Feng Huang, Dale Gary, Robert Barat, Filipe Oliveira, and David Zimdars, 'THz Imaging and Sensing for Security Applications - Explosives, Weapons, and Drugs', Semicond. Sci. Technol. 20 S266-S280 (2005).
John. F. Federici, Robert Barat, D. Gary, "THz Imaging System and Method", US Patent 6,815,683 B2, (2004).
John F. Federici and Dale Gary, Terahertz Imaging for Near-Field Objects”, US Patent 7105820 (2006).
F. Huang, B. Schulkin, H. Altan, J. Federici, D. Gary, R. Barat, D. Zimdars, M. Chen and D. Tanner, 'Terahertz Study of 1,3,5-Trinitro-s-triazine (RDX) by Time Domain Spectroscopy and FTIR', Appl. Phys. Lett., 85 5535 (2004).
K. P. Walsh, B. Schulkin, D. Gary, J. F. Federici, R. Barat, D. Zimdars, 'Terahertz near-field interferometric and synthetic aperture imaging,' Proc. SPIE 5411, 9 (2004).
F. Oliveira, R. Barat, B. Schulkin, F. Huang, J. Federici, D. Gary, and D. Zimdars, 'Analysis of THz Spectral Images of Explosives and Bio-Agents using Trained Neural Networks', Proc. SPIE 5411, 45 (2004).
Feng Huang, John F. Federici, Robert Barat, Dale Gary, 'Detection of the agent inside or behind a barrier material', Proc. SPIE Vol. 5584, p. 32-41, 2004
Feng Huang, John F. Federici, Robert Barat, Dale Gary, David Zimdars, 'Optical properties around resonance peaks by THz-TDS', Proc. SPIE Vol. 5584, p. 23-31, 2004.
John F. Federici, Dale Gary, Brian Schulkin, Feng Huang, Hakan Altan, Robert Barat, and David Zimdars, "Terahertz imaging using an interferometric array", Appl. Phys. Lett. 83, 2477 (2003).
Felipe Oliveira, Robert Barat, Brian Schulkin, John F. Federici, Dale Gary, and David A. Zimdars, 'Neural network analysis of terahertz spectra of explosives and bio-agents', Proc SPIE 5070, 60 (2003).
Hakan Altan, Feng Huang, John F. Federici, Aidong Lan, and Haim Grebel, 'Characteristics of nanoscale composites by terahertz spectroscopy', Proc SPIE 5070, 53 (2003).
THz Waveguides
A. Bandyopadhyay, A. Sengupta, and J. F Federici, V. Johnson and J. A Harrington, ‘Characterization of Hollow Polycarbonate Metal waveguides using Terahertz time domain spectroscopy’, submitted to J. Opt. Soc. America B.
A. Bandyopadhyay, A. Sengupta, V. Johnson, J. A Harrington, and John F Federici, 'Characterization of Hollow Polycarbonate Metal waveguides using Terahertz time domain spectroscopy', SPIE Photonics West, January 2006.
THz Technology
O. Sternberg, K. Stewart, J. Fischer, Y. L. Hor, A. Bandyopadhyay, J. F Federici, M. Bornefeld, Y.-L. Mathis, K.D.Möller and H. Grebel, ‘Square Shaped Metal Screens in the IR to THz Spectral Region: Resonance Wavelengths and Bandpass Filter Characteristics’, submitted to Appl. Optics.
A. Sengupta, A. Bandyopadhyay, B. F. Bowden, J.A. Harrington, and J.F. Federici, ‘Characterization of olefin copolymers using terahertz spectroscopy’, submitted to Electron. Lett.
H. Altan, A. Sengupta, J F Federici, H. Grebel, D. Pham, 'Estimation of Defect Characteristics of HfO2 and SiO2 on p-type silicon wafers using THz spectroscopy', submitted for publication.
Feng Huang, John F. Federici, and Dale Gary, 'Determining thickness independently from optical constants by use of ultrafast light', Opt. Lett. 29, 2435 (2004).
Solid State Physics (nanotubes and other)
H. Altan, F. Huang, J. F. Federici, A. Lan, H. Grebel, “Optical and Electronic Characteristics of Single Walled Carbon Nanotubes and Silicon Nanoclusters by THz Spectroscopy”, J. Appl. Phys. 96, 6685 (2004)
Hakan Altan, Feng Huang, John F. Federici, Aidong Lan, and Haim Grebel, 'Characteristics of Nano-scale Composite Materials using THz spectroscopy', Proc. SPIE 5268, p53-60, (2004).
John Federici and Haim Grebel, “Characterization of nanoscale composites at Thz and IR spectral regions”, Int. J. of High Speed Elec. and Sys., 13, 969-993 (2003)
J. F. Federici and H. Grebel, "Characteristics of Nano-Scale Composites at THz and IR Spectral Regions", in Sensing Science and Technology at THz Frequencies, Volume II. Emerging Scientific Applications & Novel Device Concepts, ed. D. Woodard, M. Shur, W. Loerop.
S. Vijayalakshmi, M. George, J. F. Federici, Z. Iqbal and H. Grebel, "Non-linear optical properties of silicon nanoclusters", Thin Solid Films 339, 102-108 (1999).
J.F. Federici, B.I. Greene, D.R. Dykaar, F. Sharifi, and R.C. Dynes, `Direct picosecond measurement of photoinduced Cooper pair breaking in lead', Phys. Rev. B 46, 11153, (1992).
P. Saeta, J.F. Federici, B.I. Greene, and D.R. Dykaar, `Intervalley scattering in GaAs and InP probed by far infrared absorption spectroscopy', Appl. Phys. Lett. 60, 1477, (1992).
B. I. Greene, J. F. Federici, D. R. Dykaar, A. F. J. Levi and L. Pfeiffer, `Picosecond Pump and Probe Spectroscopy Utilizing Freely Propagating Terahertz Radiation', Opt. Lett. 16, 48 (1991).
Near-field Microscopy, THz sources and Detectors
J. F. Federici and O. Mitrofanov, "Near Field THz Microscopy", Physics in Medicine & Biology, 47 3727-3734 (2002).
O. Mitrofanov, M. Lee, J. W. P. Hsu, I. Brener, R. Harel, J. Federici, J. D. Wynn, L. N. Pfeiffer, and K. W. West, 'Collection mode near-field imaging with 0.5 THz pulses', IEEE Journal of Selected Topics in Quantum Electronics 7, 600 (2001)..
O. Mitrofanov, M. Lee, J. W. P. Hsu, L. N. Pfeiffer, K. W. West, J. D. Wynn, J. F. Federici, 'Terahertz Pulse Propagation through Small Apertures', Appl. Phys. Lett. 79, 907 (2001).O. Mitrofanov, R. Harel, M. Lee, L. N. Pfeiffer, K. West, J. D. Wynn, J. Federici, "Study of the Single-Cycle Pulse Propagation inside the Near-Field Probe', Appl. Phys. Lett. 78, 252 (2001).
O. Mitrofanov, I Brener, R. Harel, J. D. Wynn, M. Lee, J. Federici, "Far-Infared Near Field Microscopy based on a Collection Mode detector", Appl. Phys. Lett. 77, 3496 (2000).
O. Mitrofanov, I. Brener, M. C. Wanke, R. R. Ruel, J. D. Wynn, A. J. Bruce, J. Federici, "Near-Field microscope probe for far infrared time domain measurements," Applied Physics Letters 77, 591 (2000).
Y. Cai, I. Brener, J. Lopata, J. Wynn, L. Pfeiffer, J. B. Stark, Q. Wu, X. C. Zhang, and J. F. Federici, "Coherent Terahertz Radiation Detection: Direct Comparison Between Free-Space Electro-optic Sampling and Antenna Detection", Appl. Phys. Lett. 73, 444 (1998).
Y. Cai, I. Brener, J. Lopata, J. Wynn, L. Pfeiffer and J. Federici, `Singular Electric Field Terahertz Emitters and Detectors’ in Trends in Optics and Photonics Series 13, 237 (1997).
Y. Cai, I. Brener, J. Lopata, J. Wynn, L. Pfeiffer, and J. Federici, `Design and performance of singular electric field terahertz photoconducting antennas,' Appl. Phys. Lett. 71, 2076 (1997).
B.I. Greene, J.F. Federici, D.R. Dykaar, R.R. Jones, and P.H. Bucksbaum, `Interferometric characterization of 160 fs far-infrared light pulses', Appl. Phys. Lett. 59, 893, (1991).
D. R. Dykaar, B. I. Greene, J. F. Federici, A. F. J. Levi, L. Pfeiffer and R. Kopf, `Log-Periodic Antennas for Pulsed Terahertz Radiation', Appl. Phys. Lett. 59, 262 (1991).
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)Macroelectronics
This work has focused mostly on characterization and device applications of large area electronic circuits which are fabricated on flexible substrates such as plastic. This work is funded by a NJ Commission of Science and Technology grant which supports the NJ Center for Macroelectronics (NJIT and Princeton University collaboration).
H. C. Lim, B. J. Shulkin, M. J. Pulikal, S. Liu
1, R. Petrova, G. Thomas, S. Wagner,K. Sidhu, and J. F. Federici, "Flexible membrane pressure sensor", Sensors and Actuators A (Physical), 119, 332-5 (2005).Photoinduced Superconductivity
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).
Photonics Education
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).