A Graphene-Based Terahertz Hot Electron Bolometer with Johnson Noise Readout

被引：0
|
作者：
W. Miao
H. Gao
Z. Wang
W. Zhang
Y. Ren
K. M. Zhou
S. C. Shi
C. Yu
Z. Z. He
Q. B. Liu
Z. H. Feng
机构：
[1] CAS,Purple Mountain Observatory
[2] CAS,Key Lab of Radio Astronomy
[3] Hebei Semiconductor Research Institute,undefined
来源：
Journal of Low Temperature Physics | 2018年 / 193卷
关键词：
Graphene; Terahertz; Hot electron bolometer; Johnson noise readout; Equivalent noise power;
D O I：
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中图分类号：
学科分类号：
摘要：
In this paper, we present the development of a graphene-based hot electron bolometer with Johnson noise readout. The bolometer is a graphene microbridge connected to a log spiral antenna by Au contact pads. The Fourier transform spectrometer measurement shows the bolometer has high coupling efficiency in the frequency range from 0.3 to 1.6 THz. Using 300/77 K blackbody loads, we measure an optical noise equivalent power of 5.6 × 10−12 W/Hz0.5 at 3.0 K. To understand the thermal transport inside the graphene microbridge, we measure the bolometers with different microbridge lengths at different bath temperatures. We find that the thermal conductance due to electron diffusion is significant in the bolometers.
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页码：387 / 392
页数：5
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