The transmission characteristics of surface plasmon polaritons in ring resonator. Opt Express

State Key Laboratory of Optoelectronic Materials and Technologies, Zhongshan (Sun Yat-Sen) University, Guangzhou 510275, China.
Optics Express (Impact Factor: 3.49). 12/2009; 17(26):24096-101. DOI: 10.1364/OE.17.024096
Source: PubMed


A two-dimensional nanoscale structure which consists of two metal-insulator-metal (MIM) waveguides coupled to each other by a ring resonator is designed. The transmission characteristics of surface plasmon polaritons are studied in this structure. There are several types of modes in the transmission spectrum. These modes exhibit red shift when the radius of the ring increases. The transmission properties of such structure are simulated by the Finite-Difference Time-Domain (FDTD) method, and the eignwavelengths of the ring resonator are calculated theoretically. Results obtained by the theory of the ring resonator are consistent with those from the FDTD simulations.

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    • "SPP filters are one kind of the key components in the SPP integration platform. Different SPP filter structures based on the MIM waveguides have been proposed recently, including ring resonator filters [12] [13] [14] [15] [16], toothshaped filters [17] [18] and Bragg grating filters [19] [20] [21] [22]. However, plasmonics studies have almost exclusively focused on pure metallic nanostructures and passive components whose properties are fixed by their structural parameters. "
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    • "idea of evanescent coupling was more widely recognized. For instance, the capability of MIM circular ring resonators in realization of wavelength demultiplexing was demonstrated by utilizing evanescent coupling mechanism between a ring and straight waveguides [12]. In 2010, the same idea was further pursued by substituting the circular ring with a rectangular ring [13]. "
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    • "The resonances can be excited, weakened or even cut-off by adjusting the split angle, which are easily modified to the visible and near-infrared ranges. This modulation method is more convenient than the one, which is via changing the geometric parameters of the whole ring or the partial ring [13], [15]. The transmission peaks of even resonance modes exhibit blue shift as increasing the depth of the split. "
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