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31 January 2014A tunable omni-directional sensing platform: strong light-matter interactions enabled by graphene
In this theoretical work, we report on voltage-controllable hybridization of electromagnetic modes arising from strong
interaction between graphene plasmons and molecular vibrations. Compared with the strong light-matter interaction
platforms based on noble metals, graphene offers much tighter plasmonic field confinement thus smaller effective mode
volume and higher quality-factor due to longer carrier relaxation time in midinfrared regime, leading to Rabi splitting
and hybridized polaritonic modes at 3 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 arising
from the deep confinement of the polaritonic modes gives rise to the omni-directional excitation. Our approach is
promising for practical implementations in infrared sensing and detection.