Terahertz (=1012) wave (THz wave) is new
electromagnetic wave between infrared wave and millimeter wave (see figure 1).
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THz waves have some advantages over conventional FIR sources. | |
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High Intensity |
SNR > 108 |
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Detectable at room temperature |
| Short time width |
~ 1ps |
| Broad bandwidth | 100GHz ~ 10THz (l = 3 mm-30 mm) |
| Electric fields of the electromagnetic wave are observable. | |
In our laboratory, we investigate radiation mechanisms of the THz radiation from semiconductor surfaces by femtosecond laser pulse irradiation and low-energy dynamics in THz region.
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Electric field waveform of THz radiation |
Experimental layout |
| Recent Publication |
| “Competing
terahertz radiation mechanisms in semi-insulating InP at high-density
excitation” M. Nakajima, Y. Oda, and T. Suemoto, Applied Physics Letters, 85, 2694-2696 (2004). |
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“Polarity
reversal of the magnetic field induced component of terahertz radiation from
InAs surfaces at high density excitation”
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