Gao Zijie, Shi Yanpeng, Li Meiping, Song Jinmei, Liu Xiaoyu, Wang Xiaodong, Yang Fuhua
School of Microelectronics, Shandong University, Jinan 250100, China.
Engineering Research Center for Semiconductor Integrated Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.
ACS Omega. 2021 Oct 27;6(44):29746-29751. doi: 10.1021/acsomega.1c04172. eCollection 2021 Nov 9.
Tunable extraordinary optical transmission (EOT) with graphene is realized using a novel metallic ring-rod nested structure in the terahertz frequency regime. The generated double-enhanced transmission peaks primarily originate from the excitation of localized surface plasmon resonances (LSPRs). On using graphene, the resonating surface plasmon distribution changes in the reaction plane, which disturbs the generation of LSPRs. By regulating the Fermi energy ( ) of the graphene to reach a certain level, an adjustment from bimodal EOT to unimodal EOT is obtained. As the of the graphene integrated beneath the rod increases to 0.5 eV, the transmittance of the peak at 2.42 THz decreases to 6%. Moreover, the transmission peak at 1.77 THz virtually disappears due to the increasing to 0.7 eV when the graphene is placed beneath the ring. The significant tuning capabilities of the bimodal EOT indicate its promising application prospects in frequency-selective surfaces, communication, filtering, and radar.
在太赫兹频率范围内，利用一种新型金属环棒嵌套结构实现了石墨烯可调谐的异常光学传输（EOT）。所产生的双增强传输峰主要源于局域表面等离子体共振（LSPRs）的激发。使用石墨烯时，共振表面等离子体分布在反应平面内发生变化，这会干扰LSPRs的产生。通过调节石墨烯的费米能量（ ）达到一定水平，可实现从双峰EOT到单峰EOT的调整。当集成在棒下方的石墨烯的 增加到0.5电子伏特时，2.42太赫兹处峰的透射率降至6%。此外，当石墨烯置于环下方时，由于 增加到0.7电子伏特，1.77太赫兹处的传输峰几乎消失。双峰EOT的显著调谐能力表明其在频率选择表面、通信、滤波和雷达等方面具有广阔的应用前景。
