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<div><font face="Arial" color="#000000">Seminar on<br>
<b>Modern Optics and Spectroscopy<br>
<br>
<br>
Xi-Cheng Zhang</b>,<br>
Rensselaer Polytechnic Institute<br>
<br>
<i><b>Recent development of THz wave technology for sensing and
imaging applications<br>
<br>
</b></i>April 3, 2007<br>
<br>
12:00 - 1:00 p.m.</font></div>
<div><font face="Arial" color="#000000">Grier Room 34-401<br>
<br>
</font><font color="#000000">Historically, THz technologies were
mainly used by the astronomy community<br>
for searching far-infrared radiation (cosmic background), and by the
laser<br>
fusion community for the diagnostics of plasmas. Since the first<br>
demonstration of THz wave time-domain spectroscopy in the late 80's,
there<br>
has been a series of significant advances (particularly in recent
years) as<br>
intense THz sources and more sensitive detectors provide new
opportunities<br>
for understanding the basic science in the THz frequency range. Now,
the<br>
region of the electromagnetic spectrum from 0.3 to 10 THz (1 mm - 30
É m<br>
wavelength) is a frontier area for research in physics, chemistry,
biology,<br>
materials science and medicine. Recently, the observations of THz
wave<br>
generation, manipulation, amplification, and detection in the laser
induced<br>
atmospheric plasma provide us the greatest flexibility in remote
sensing and<br>
spectroscopy. However, the research of the basic science and
engineering of<br>
THz waves in laser induced plasma, especially the amplification of THz
waves<br>
in the plasma, is just beginning. I will report the THz wave photonics
in<br>
laser induced air plasma for potential remote sensing and
spectroscopic</font></div>
<div><font color="#000000">applications</font></div>
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