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

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3 Author(s)
Kawaguchi, Y. ; Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, JapanCREST, Japan Science and Technology Corporation ; Hirakawa, K. ; Komiyama, S.

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We have developed a high sensitivity far-infrared (FIR) photodetector by using the two-dimensional electron gas system in modulation-doped Al0.3Ga0.7As/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 (850×850 μm2), the responsivity reached as high as 5.8×104V/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. © 2002 American Institute of Physics.

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Applied Physics Letters  (Volume:80 ,  Issue: 18 )