Tunable plasmon resonance wavelength of the periodic gold film with converging and diverging shaped slits and grooves |
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Authors: | Hongjian Li Suxia Xie Zhimin Liu Haiqing Xu |
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Institution: | a College of Physics Science and Technology, Central South University, Changsha 410083, PR Chinab College of Materials Science and Engineering, Central South University, Changsha 410083, PR China |
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Abstract: | We investigate a periodic slit-groove metal array with converging and diverging shaped channels by using the finite-difference time-domain (FDTD) method. We show that the peaks and dips of the transmission spectra can be tuned by the geometry parameters of the groove. And the resonance modes are strongly correlated with the groove depth and width of both ends of the groove, and the transmission dip between the resonance modes can be modulated by these parameters. However, the distance between the slit and the groove has little influence on the transmission. We show that the periodic slit-groove with diverging and converging shaped channels is useful for the design of plasmonic devices. |
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Keywords: | A Groove-slit array D Localized waveguide resonance D Surface plasmon resonance |
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