Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, United States.
ACS Nano. 2012 Sep 25;6(9):7806-13. doi: 10.1021/nn301888e. Epub 2012 Aug 9.
We propose an active plasmonic device based on graphene. Highly confined plasmonic waves in monolayer graphene are efficiently excited using an etched diffractive grating on silicon. The guided-wave resonance of the combined structure creates a sharp notch on the normal-incidence transmission spectra, as the incident optical wave couples to the graphene plasmonic wave. This structure can be used as a highly tunable optical filter or a broad-band modulator because the resonant wavelength can be quickly tuned over a wide wavelength range by a small change in the Fermi energy level of the graphene. In this paper, we analyze the performance of this device with finite-difference time-domain simulations. We compare the proposed structure with recently demonstrated graphene nanoribbons based on bound plasmonic oscillations.
我们提出了一种基于石墨烯的主动等离子体装置。在硅上刻蚀的衍射光栅可高效激发单层石墨烯中的高度受限等离子体波。组合结构的导波共振在正入射传输光谱上产生了一个尖锐的陷波，因为入射光与石墨烯等离子体波耦合。由于石墨烯费米能级的微小变化即可在很宽的波长范围内快速调谐共振波长，因此该结构可用作高度可调谐的光滤波器或宽带调制器。本文通过时域有限差分法模拟分析了该器件的性能。我们将所提出的结构与最近基于束缚等离子体振荡的石墨烯纳米带进行了比较。
