Difference between revisions of "Terahertz Electronics"

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<big>[[THz imaging]]</big>
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[[Image:THzCDMAimaging.jpg|center|500px]]
 
 
 
 
<big>'''THz imaging'''</big>
 
[[Image:THzCDMAimaging.jpg|left|500px]]
 
<br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
 
  
 
<big>'''THz coherent optical computer'''</big><br>
 
<big>'''THz coherent optical computer'''</big><br>
 
[[Image:THzCOC.jpg|left|300px]]
 
[[Image:THzCOC.jpg|left|300px]]
<br>
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Single point terahertz imagery of 2D objects is demonstrated by exploiting the broadband nature of ultrafast terahertz wave in a coherent optical computing setup. In the devised imagery, a collimated terahertz beam is illuminated on an object and the scattered fields are measured through a spatial mask at the Fourier plane in a 4-f terahertz time-domain spectroscope. This arrangement allows conversion of radial spatial frequencies of the object to the temporal spectrum of the pulse. Hence, a 2D image stored in the terahertz waveforms can be readily obtained.
Coherent optical computer(COC) is a optical imaging system which has 2 lens for defining a spatial frequnecy plane and an imaging plane.  
 
Due to its extream broadband nature, THz Imaing systems based on COC don't have to get full spatial frequnecy scanning.
 
Instead of the spatial frequnecy scanning, whole frequnecy part of T-ray can be used in imaging process.  
 
Therefore, images are obtained from much less waveforms.
 
Our result shows only 30 waveforms can give well images.
 

Latest revision as of 08:48, 11 September 2009

THzCDMAimaging.jpg

THz coherent optical computer

THzCOC.jpg

Single point terahertz imagery of 2D objects is demonstrated by exploiting the broadband nature of ultrafast terahertz wave in a coherent optical computing setup. In the devised imagery, a collimated terahertz beam is illuminated on an object and the scattered fields are measured through a spatial mask at the Fourier plane in a 4-f terahertz time-domain spectroscope. This arrangement allows conversion of radial spatial frequencies of the object to the temporal spectrum of the pulse. Hence, a 2D image stored in the terahertz waveforms can be readily obtained.