School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA.
Nano Lett. 2012 Oct 10;12(10):5202-6. doi: 10.1021/nl302322t. Epub 2012 Sep 11.
Dynamic switching of a plasmonic resonance may find numerous applications in subwavelength optoelectronics, spectroscopy, and sensing. Graphene shows a highly tunable carrier concentration under electrostatic gating, and this could provide an effective route to achieving electrical control of the plasmonic resonance. In this Letter, we demonstrate electrical control of a plasmonic resonance at infrared frequencies using large-area graphene. Plasmonic structures fabricated on graphene enhance the interaction of the incident optical field with the graphene sheet, and the impact of graphene is much stronger at mid-infrared wavelengths. Full-wave simulations, where graphene is modeled as a 1 nm thick effective medium, show excellent agreement with experimental results.
动态切换等离子体共振可能在亚波长光电子学、光谱学和传感领域找到许多应用。石墨烯在静电门控下表现出高度可调的载流子浓度，这可能为实现等离子体共振的电控制提供有效途径。在这封信中，我们使用大面积石墨烯演示了红外频率下等离子体共振的电控制。在石墨烯上制造的等离子体结构增强了入射光场与石墨烯片的相互作用，而在中红外波长下，石墨烯的影响要强得多。全波模拟中，将石墨烯建模为 1nm 厚的有效介质，与实验结果非常吻合。
