Department of Electrical and Computer Engineering, National University of Singapore, 117576, Singapore. Centre for Advanced 2D Materials, National University of Singapore, 6 Science Drive 2, 117546 Singapore. Institute of Materials Research and Engineering (IMRE), 3, Research Link, 117602, Singapore.
Nanotechnology. 2017 Mar 3;28(9):095201. doi: 10.1088/1361-6528/aa57ad. Epub 2017 Jan 9.
We report a highly efficient tunable THz reflector in graphene. By applying a small gate voltage (up to ±3 V), the reflectance of graphene is modulated from a minimum of 0.79% to a maximum of 33.4% using graphene/ionic liquid structures at room temperature, and the reflection tuning is uniform within a wide spectral range (0.1-1.5 THz). Our observation is explained by the Drude model, which describes the THz wave-induced intraband transition in graphene. This tunable reflectance of graphene may contribute to broadband THz mirrors, deformable THz mirrors, variable THz beam splitters and other optical components.
我们在石墨烯中报告了一种高效可调谐太赫兹反射镜。通过施加小的栅极电压（高达±3 V），在室温下使用石墨烯/离子液体结构将石墨烯的反射率从最低的 0.79%调谐到最高的 33.4%，并且在很宽的光谱范围内（0.1-1.5 THz）反射率调谐是均匀的。我们的观察结果通过描述太赫兹波诱导石墨烯中带内跃迁的 Drude 模型来解释。这种可调谐的石墨烯反射率可能有助于宽带太赫兹反射镜、可变形太赫兹反射镜、可变太赫兹分束器和其他光学元件。
