太赫兹辐射
石墨烯
超短脉冲
迪拉克费米子
光电流
光电导性
物理
照相混合
半导体
材料科学
纳米技术
光电子学
光学
远红外激光器
激光器
太赫兹超材料
作者
Mark D. Thomson,Florian Ludwig,Jakob Holstein,Reiam Al-Mudhafar,Shihab Al-Daffaie,Hartmut G. Roskos
出处
期刊:ACS Nano
[American Chemical Society]
日期:2024-02-01
卷期号:18 (6): 4765-4774
标识
DOI:10.1021/acsnano.3c08731
摘要
Graphene has recently been shown to exhibit ultrafast conductivity modulation due to periodic carrier heating by either terahertz (THz) waves, leading to self-induced harmonic generation, or the intensity beat note of two-color optical radiation. We exploit the latter to realize an optoelectronic photomixer for coherent, continuous-wave THz detection, based on a photoconductive antenna with multilayer CVD-grown graphene in the gap. While for biased THz emitters the dark current would pose a serious detriment for performance, we show that this is not the case for bias-free THz detection and demonstrate detection up to frequencies of at least 700 GHz at room temperature, even without optimized tuning of the doping. We account for the photocurrent and photomixing response using detailed simulations of the time-dependent carrier distribution, which also indicate significant potential for enhancement of the sensitivity, to become competitive with well-established semiconductor photomixers.
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