Xi-Cheng Zhang 
J. Erik Jonsson ’22 Professor of Science; Professor of Physics; Professor of Electrical, Computer & System Engineering
Education:
Ph.D., Physics, Brown University, 1986.
M.S., Physics, Brown University, 1983.
B.S., Physics, Peking University, Beijing, China, 1982.
Career Highlights:
X.-C. Zhang has received 20 patents and numerous awards including the National Science Foundation’s CAREER award, Research Corporation’s Cottrell Award, Rensselaer early career award, and China’s Outstanding Scholar Award. He is a Fellow of IEEE, the Optical Society of America, and was elected a Fellow of the American Physics Society in 2002. He joined RPI in 1992.
Research Interests:
Terahertz Optics Sensing
Zhang’s work with time-domain THz spectroscopy systems holds promise for diagnostics of materials such as semiconductors and biomolecules. THz time-domain spectroscopy uses short pulses of broadband THz radiation, typically generated using ultrafast laser pulses. The transmitted THz electric field is measured coherently, which provides both high sensitivity and time-resolved phase information.
Terahertz Optics Imaging
Zhang’s interest in THz wave imaging is a result of the availability of phase-sensitive spectroscopic images. These images, called “functional images,” are ideal for dry dielectric substances including paper, plastics, and ceramics. Zhang’s research centers on two-dimensional THz wave imaging through free-space electro-optic detection and on THz ray, or T-ray, imaging for probing the dielectric properties of three-dimensional structures.
Selected Publications:
“Coherent terahertz echo of tunnel ionization in gases,” Nicholas Karpowicz and X.-C. Zhang, Physics Review Letters, 102, 093001 (2009).
“Terahertz wave generation from gas plasma at standoff distances using a phase compensator with attosecond phase-control accuracy,” Jianming Dai and X.-C. Zhang, Applied Physics Letters, 94, 021117 (2009).
“Systematic study of broadband terahertz gas sensor,” Xiaofei Lu, Nicholas Karpowicz, Yunqing Chen, X.-C. Zhang, Applied Physics Letters, 93, 261106 (2008).
“Coherent millimeter wave to mid-infrared measurements with continuous bandwidth reaching 40 THz,” N. Karpowicz, J. Chen, T. Tongue, and X.-C. Zhang, Electronics Letters 44, 544 (2008).
“Tunable Broadband Anti-Reflection Structures for Silicon at Terahertz Frequency,” Y. W. Chen, P. Y. Han and X.-C. Zhang, Applied Physics Letters, 94, 041106 (2009)
“Direct observation of transition of surface plasmon resonance from photonic crystal effect,” Weili Zhang, Abul K. Azad, and Jiaguang Han, Jingzhou Xu, Jian Chen, and X.-C. Zhang, Physics Review Letters, 98 183901 (2007).
“Detection of broadband terahertz waves with laser-induced plasma in gases,” J.M. Dai, X Xie, and X.-C. Zhang, Physics Review Letters, 97, 103903 (2006);
“Coherent control of THz wave generation in ambient air,” X. Xie, J.M. Dai, and X.-C. Zhang, Physics Review Letters, 96, 075005 (2006).
Contact:
(518) 276-3079
zhangxc@rpi.edu
Home Page: http://www.rpi.edu/~zhangxc
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