Integrated Terahertz Graphene Modulator with 100% Modulation Depth
By G. Liang, Xiaonan Hu, Xuechao Yu, Youde Shen, Lianhe H. Li, A. Davies, E. Linfield, Houkun Liang, Ying Zhang, S. Yu and 1 more. 2015
180 citations recorded by the source corpus.
Terahertz (THz) frequency technology has many potential applications in nondestructive imaging, spectroscopic sensing, and high-bit-rate free-space communications, with an optical modulator being a key component. However, it has proved challenging to achieve high-speed modulation with a high modulation depth across a broad bandwidth of THz frequencies. Here, we demonstrate that a monolithically integrated graphene modulator can efficiently modulate the light intensity of the THz radiation from a THz quantum cascade laser with a 100% modulation depth for certain region of the pumping current, as a result of the strongly enhanced interaction between the laser field and the graphene enabled by this integration scheme. Moreover, the small area of the resulting device in comparison to existing THz modulators enables a faster modulation speed, greater than 100 MHz, which can be further improved through optimized designs of the laser cavity and modulator architectures. Furthermore, as the graphene absorption spe...
Subfields: Electrical and Electronic Engineering, Spectroscopy
View Paper: https://www.semanticscholar.org/paper/6ff58fe9d703ae9cf8376da1afb640732ddd1462
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In Electrical and Electronic Engineering
Citations in the corpus
- Graphene-plasmon polaritons: From fundamental properties to potential applications (2016, background): “These extraordinary features of graphene plasmons have stimulated intense lines of investigation into both the fundamental properties of graphene plasmons [35–37] and potential applications in metamaterials [30, 38], modulators [39, 40], photodetectors [41], and sensors [42, 43].”