期刊
JOURNAL OF OPTICS
卷 15, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2040-8978/15/2/025007
关键词
surface plasmons; plasmon hybridization; Fano resonance
类别
资金
- National Science Foundation of China [10974183, 11104252]
- Doctoral Fund of the Ministry of Education of China [20114101110003]
- Aeronautical Science Foundation of China [2011ZF55015]
- Basic and Frontier Technology Research Program of Henan Province [112300410264, 122300410162]
- Key Science and Technology Program of Henan Province [112102310543]
- He'nan Educational Committee Natural Science Foundation [12A140002]
The optical properties of asymmetric ring structures are investigated theoretically by using the discrete dipole approximation method. The numerical results revealed that this kind of structure can achieve a giant localized field enhancement (LFE, 264) and a high LSPR sensitivity (corresponding FOM, 8.28) in the visible spectrum by Fano resonance, whose origin is discussed based on plasmon hybridization theory. Furthermore, the dependence of the Fano resonance on the polarization states of the incident light is also demonstrated. Giant LFE and high LSPR sensitivity enable this structure to be promising for surface enhanced Raman spectroscopy and sensing applications.
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