High-sensitivity quantum Hall far-infrared photodetector integrated with log-periodic antenna

Kawaguchi, Y.; Hirakawa, K.; Komiyama, S.
May 2002
Applied Physics Letters;5/6/2002, Vol. 80 Issue 18, p3418
Academic Journal
We have developed a high sensitivity far-infrared (FIR) photodetector by using the two-dimensional electron gas system in modulation-doped Al[sub 0.3]Ga[sub 0.7]As/GaAs heterojunctions. A FIR-sensitive channel was formed by applying a negative bias voltage to the split gates which were integrated with a log-periodic antenna. Although the area of sensitivity was small (850 x 850 µ²), the responsivity reached as high as 5.8 x 10[sup 4] V/W. It is also demonstrated that the responsivity can be modulated by a factor of 10 by changing the split-gate voltages. The capability of ON/OFF switching of photoresponsivity suggests that this detector is suitable for realizing high sensitivity FIR imaging arrays.


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