太赫兹辐射
材料科学
砷化镓
照相混合
连续波
光电子学
太赫兹光谱与技术
动态范围
带宽(计算)
砷化铟镓
光学
激光器
光谱学
宽带
远红外激光器
电信
物理
太赫兹超材料
量子力学
计算机科学
作者
Milan Deumer,Steffen Breuer,Robert B. Kohlhaas,Simon Nellen,Lars Liebermeister,Sebastian Lauck,Martin Schell,Björn Globisch
出处
期刊:Optics Express
[Optica Publishing Group]
日期:2021-12-01
卷期号:29 (25): 41819-41819
被引量:20
摘要
We present photomixers made of iron doped indium gallium arsenide (InGaAs:Fe) as broadband receivers in optoelectronic continuous wave (cw) terahertz (THz) systems. InGaAs:Fe shows higher resistivity and shorter carrier lifetimes compared to the state-of-the-art low-temperature-grown material. These improved material properties translate into an improved frequency response and lower noise level of the InGaAs:Fe photomixers. We were able to measure a bandwidth of 4.5 THz with a peak dynamic range of 112 dB at 30 mW laser excitation around 1550 nm. To the best of our knowledge, these are record high values for cw THz spectroscopy. Furthermore we achieved an increased dynamic range by up to 10 dB for frequencies above 1 THz compared to state-of-the-art photomixing receivers. These improvements enable faster and more precise spectroscopy with higher bandwidth. In industrial non-destructive testing, the measurement rate may be increased by a factor of ten posing a valuable contribution to inline process monitoring.
科研通智能强力驱动
Strongly Powered by AbleSci AI