Journal
JOURNAL OF OPTICS
Volume 13, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2040-8978/13/7/075005
Keywords
surface plasmons; perfect absorption; field enhancement; metamaterials
Categories
Funding
- National Science Foundation of China [10974183]
- Aeronautical Science Foundation of China [2008ZF55006, 2009ZF55006]
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Dual-band perfect absorbers involving an array of gold nanoellipsoids or nanoellipsoid dimers near a gold film are designed and their resonance absorptions and field enhancements are numerically investigated. It is shown that the multilayer structures combining gold nanoparticles and gold film enable dual-band higher absorption and larger field enhancement than the structures without the metal film, due to the strong coupling between the localized surface plasmon resonance from the particles or particle dimers and the surface plasmon polaritons from the gold film. A field enhancement factor (vertical bar E vertical bar/vertical bar E-0 vertical bar) of more than 10(2) is achieved at the positions of 2.5 nm from the particle tip at two distinct wavelengths in the surface-plasmon-coupled nanoellipsoid dimer structure. The results suggest that the coupling of the localized surface plasmon resonance and the surface plasmon polaritons excited in the plasmonic metamaterials may have potential applications for multifrequency absorbers, emitters and SERS substrates as well as sensing.
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