Graphene-based terahertz photodetector by noise thermometry technique

被引：7
|
作者：
Wang, Ming-Jye [1 ,2 ]
Wang, Ji-Wun [1 ,3 ]
Wang, Chun-Lun [1 ]
Chiang, Yen-Yu [1 ]
Chang, Hsian-Hong [1 ]
机构：
[1] Acad Sinica, Inst Astron & Astrophys, Taipei 10617, Taiwan
[2] Acad Sinica, Inst Phys, Taipei 11529, Taiwan
[3] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan
来源：
APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 03期
关键词：
PHOTORESPONSE;
D O I：
10.1063/1.4862406
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report the characteristics of graphene-based terahertz (THz) photodetector based on noise thermometry technique by measuring its noise power at frequency from 4 to 6 GHz. Hot electron system in graphene microbridge is generated after THz photon pumping and creates extra noise power. The equivalent noise temperature and electron temperature increase rapidly in low THz pumping regime and saturate gradually in high THz power regime which is attributed to a faster energy relaxation process involved by stronger electron-phonon interaction. Based on this detector, a conversion efficiency around 0.15 from THz power to noise power in 4-6 GHz span has been achieved. (C) 2014 AIP Publishing LLC.
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页数：4
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