Quantum Hall Dual-Band Infrared Photodetector

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题名:	Quantum Hall Dual-Band Infrared Photodetector
作者:	Chiu-Chun Tang;K. Ikushima;D. C. Ling, C. C. Chi;Jeng-Chung Chen
关键词:	Quantum Physics;Semiconductor Physics;optoelectronics
日期:	2017-12
上传时间:	2017-12-19 02:11:04 (UTC+8)
出版者:	AIP
摘要:	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.
關聯:	PHYSICAL REVIEW APPLIED 8(6), 064001(8pages)
DOI:	10.1103/PhysRevApplied.8.064001
显示于类别:	[物理學系暨研究所] 期刊論文

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