• Electrical & Electronic Materials
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• v.27 no.8
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• pp.3-14
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• 2014

• Journal of the Korean Society for Nondestructive Testing
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• v.30 no.4
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• pp.352-358
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• 2010

This paper presented compact CW sub-THz imaging system using the terahertz transmitter(Tx) that generating 0.34 THz electromagnetic wave on based electronic device. Using 0.34 THz electromagnetic wave generated by Tx, we transmitted to sample by point by point scan method and measured transmitting terahertz wave magnitude and phase information respectively with terahertz receiver(Rx) based on sub harmonic mixer. This paper measured and compared images of several samples to obtain better imaging results by changing time delay and step distance of scanning stage which affect image resolution. Also, through the imaging measurement of various samples, we were able to assure possibility of application of terahertz wave.

• Proceedings of the Optical Society of Korea Conference
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• 2007.07a
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• pp.49-50
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• 2007

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.23 no.5
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• pp.5-14
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• 2012

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.22 no.4
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• pp.42-54
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• 2011

• Korean Journal of Optics and Photonics
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• v.25 no.5
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• pp.279-285
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• 2014

We propose an electrically controllable terahertz wave modulator based on a metamaterial and vanadium dioxide ($VO_2$) thin film. A square loop shape is designed to play the roles of both a resonating metamaterial and a heater to electrically control the conductivity of $VO_2$. The transmission characteristics of the modulator were controlled by voltage. The transmission coefficient of the modulator was stably changed from 0.27 to 0.80 at 470 GHz according to the conductivity values of $VO_2$.

• Journal of the Korean Vacuum Society
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• v.15 no.5
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• pp.435-450
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• 2006

Free electron lasers (FELs) are promising sources of coherent radiation that can provide users with radiations having a wide-range frequency-tunability and good spectral characteristics for basic science and industrial applications. Especially in Terahertz or X-ray ranges of spectrum, FELs can generate much stronger radiations than conventional light sources. In this paper, we introduce the working principles and key technologies of FELs, the status and the prospects of FEL developments.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.21 no.4
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• pp.19-26
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• 2010

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.26 no.5
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• pp.3-13
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• 2015

• Optical Science and Technology
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• v.14 no.1
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• pp.12-22
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• 2010