Tunable omnidirectional strong light-matter interactions mediated by graphene surface plasmons
Tunable omnidirectional strong light-matter interactions mediated by graphene surface plasmons
复制标题
石墨烯表面等离子体介导的可调谐全向强光-物质相互作用
DOI：
10.1103/physrevb.88.115439
复制
发表时间：
2013-09-30
影响因子：
3.7
通讯作者：
Cubukcu, Ertugrul
中科院分区：
文献类型：
--
作者：
Liu, Feng;Cubukcu, Ertugrul
In this theoretical work, we report on voltage-controllable hybridization of electromagnetic modes arising from strong interaction between graphene surface plasmons and molecular vibrations. The interaction strength depends strongly on the volume density of molecular dipoles, the molecular relaxation time, and the molecular layer thickness. Graphene offers much tighter plasmonic field confinement and longer carrier relaxation time compared to noble metals, leading to Rabi splitting and hybridized polaritonic modes at three-orders-of-magnitude lower molecular densities. Electrostatically tunable carrier density in graphene allows for dynamic control over the interaction strength. In addition, the flat dispersion band above the light line arising from the deep confinement of the polaritonic modes gives rise to the omnidirectional excitation. Our approach is promising for practical implementations in infrared sensing and detection.
