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High-Speed Efficient Terahertz Modulation Based on Tunable Collective-Individual State Conversion within an Active 3 nm Two-Dimensional Electron Gas Metasurface.
Zhao, Yuncheng; Wang, Lan; Zhang, Yaxin; Qiao, Shen; Liang, Shixiong; Zhou, Tianchi; Zhang, Xilin; Guo, Xiaoqing; Feng, Zhihong; Lan, Feng; Chen, Zhi; Yang, Xiaobo; Yang, Ziqiang.
Afiliación
  • Zhao Y; School of Electronic Science and Engineering , University of Electronic Science and Technology of China , Chengdu 610054 , China.
  • Wang L; School of Electronic Science and Engineering , University of Electronic Science and Technology of China , Chengdu 610054 , China.
  • Zhang Y; School of Electronic Science and Engineering , University of Electronic Science and Technology of China , Chengdu 610054 , China.
  • Qiao S; School of Electronic Science and Engineering , University of Electronic Science and Technology of China , Chengdu 610054 , China.
  • Liang S; National Key Laboratory of Application Specific Integrated Circuit , Hebei Semiconductor Research Institute , Shijiazhuang 050051 , China.
  • Zhou T; School of Electronic Science and Engineering , University of Electronic Science and Technology of China , Chengdu 610054 , China.
  • Zhang X; School of Electronic Science and Engineering , University of Electronic Science and Technology of China , Chengdu 610054 , China.
  • Guo X; School of Electronic Science and Engineering , University of Electronic Science and Technology of China , Chengdu 610054 , China.
  • Feng Z; National Key Laboratory of Application Specific Integrated Circuit , Hebei Semiconductor Research Institute , Shijiazhuang 050051 , China.
  • Lan F; School of Electronic Science and Engineering , University of Electronic Science and Technology of China , Chengdu 610054 , China.
  • Chen Z; School of Electronic Science and Engineering , University of Electronic Science and Technology of China , Chengdu 610054 , China.
  • Yang X; School of Electronic Science and Engineering , University of Electronic Science and Technology of China , Chengdu 610054 , China.
  • Yang Z; School of Electronic Science and Engineering , University of Electronic Science and Technology of China , Chengdu 610054 , China.
Nano Lett ; 19(11): 7588-7597, 2019 11 13.
Article en En | MEDLINE | ID: mdl-31398289
Terahertz (THz) modulators are always realized by dynamically manipulating the conversion between different resonant modes within a single unit cell of an active metasurface. In this Letter, to achieve real high-speed THz modulation, we present a staggered netlike two-dimensional electron gas (2DEG) nanostructure composite metasurface that has two states: a collective state with massive surface resonant characteristics and an individual state with meta-atom resonant characteristics. By controlling the electron transport of the nanoscale 2DEG with an electrical grid, collective-individual state conversion can be realized in this composite metasurface. Unlike traditional resonant mode conversion confined in meta-units, this state conversion enables the resonant modes to be flexibly distributed throughout the metasurface, leading to a frequency shift of nearly 99% in both the simulated and experimental transmission spectra. Moreover, such a mechanism can effectively suppress parasitic modes and significantly reduce the capacitance of the metasurface. Thereby, this composite metasurface can efficiently control the transmission characteristics of THz waves with high-speed modulations. As a result, 93% modulation depth is observed in the static experiment and modulated sinusoidal signals up to 3 GHz are achieved in the dynamic experiment, while the -3 dB bandwidth can reach up to 1 GHz. This tunable collective-individual state conversion may have great application potential in wireless communication and coded imaging.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nano Lett Año: 2019 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nano Lett Año: 2019 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos