Large field enhancement and perfect absorption by coupling between dark plasmon mode and surface plasmon polaritons

摘要

The coupled plasmonic film-nanoparticles systems can realize the optical absorption and large electric field enhancement when modes hybridize. In this paper, we report, for the first time, a coupling effect between dark plasmon mode and surface plasmon polaritions in nanorod dimers plasmonic metamaterial. Near-perfect absorption and extremely large field enhancement can be achieved in coupled systems, which provide a new insight to design the high-performance surface enhanced chips for detecting individual molecules.