Fano resonances of a metal nanorod array with a symmetry breaking wedge and gain medium filling |
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| Authors: | Suxia Xie Mengxiong Wu Zhijian Li Hongjian Li Renlong Zhou Qiong Liu |
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| Affiliation: | 1. School of Physics and Electronic Science, Hunan University of Science and Technology, Xiangtan, P.R. Chinaxiesuxia@hnust.edu.cn;3. School of Physics and Electronic Science, Hunan University of Science and Technology, Xiangtan, P.R. China;4. School of Physics and Electronics, Central South University, Changsha, P.R. China |
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| Abstract: | Fano resonances of a metal nanorod array with a symmetry breaking wedge and gain medium filling have been explored using the finite-difference time-domain method. Results show that a periodic symmetry breaking nanorod array supports Fano resonance due to the interaction between a hybridized dipolar plasmon mode of the nanorod and a narrower quadrupolar mode of the slice. By a tiny increase of the imaginary part of the dielectric constant of the gain medium, the Ohmic loss can be counteracted, and Fano resonance dip gets deeper significantly. Additionally, the modulation depth can be improved by changing the real part of the gain medium dielectric constant. The results found are useful for further develop of the devices on the basis of the Fano resonance and its modulation. |
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| Keywords: | Fano resonance surface plasmon symmetry breaking nanostructure gain medium |
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