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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/112434


    Title: Quantum Hall Dual-Band Infrared Photodetector
    Authors: Chiu-Chun Tang;K. Ikushima;D. C. Ling, C. C. Chi;Jeng-Chung Chen
    Keywords: Quantum Physics;Semiconductor Physics;optoelectronics
    Date: 2017-12
    Issue Date: 2017-12-19 02:11:04 (UTC+8)
    Publisher: AIP
    Abstract: We have developed a hybrid quantum Hall midinfrared (QHMIR)–quantum Hall far-infrared (QHFIR)
    photodetector by the use of graphene-GaAs=ðAl; GaÞAs–layered composite material. Both MIR and FIR
    photoresistance are observed in a single chip by utilizing cyclotron resonance in the quantum Hall regimes
    of graphene and two-dimensional electron gas (2DEG) in GaAs=ðAl; GaÞAs heterostructure, respectively.
    By cooperatively operating 2DEG as a back-gate electrode to change the carrier density of graphene or
    graphene as a top-gate electrode to modulate the carrier density of 2DEG with an applied gate voltage less
    than 1 V and applying the magnetic field to tune cyclotron resonance, we achieve a wide frequency
    selectivity, covering 640–790 cm−1 for the graphene-QHMIR detector and 24–89 cm−1 for the 2DEGQHFIR
    detector. Moreover, our design integrates a log-periodic antenna with the detector to minimize the
    device size, while preserving high sensitivity. Our results pave the way for implementing a highly tunable
    MIR-to-FIR photodetector and a dual-band (MIR-FIR) imaging array.
    Relation: PHYSICAL REVIEW APPLIED 8(6), 064001(8pages)
    DOI: 10.1103/PhysRevApplied.8.064001
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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