Journal
JOURNAL OF OPTICS
Volume 15, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2040-8978/15/2/025004
Keywords
Fano resonance; plasmonics; sensing
Categories
Funding
- National Key Basic Research Program of China [2012CB921900, 2011CB301802]
- Key Program of the National Natural Science Foundation of China [61036005]
- National Natural Science Foundation of China [61036005, 11074240]
- Specialized Research Fund for the Doctoral Program of Higher Education [20113402110039]
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Fano resonance can exist in a T-shaped nanodimer due to interaction between the bright mode of the short nanoparticle and the dark mode of the long nanoparticle. The coupling between the bright and dark modes is studied in detail and compared with a line-shaped nanodimer. The coupling strength of the T-shaped nanodimer is enhanced due to the high density of localized electromagnetic states. It is found that the enhanced coupling strength in the T-shaped nanodimer can improve the sensitivity of the system. The different spectral responses to different spatial locations of the T-shaped nanodimer provide an effective way to monitor refractive index changes both spectrally and spatially.
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