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Photonic crystal ring resonators (PCRR) as momentous candidates for future photonic crystal integrated circuits (PCICs) draw worldwide attention. In this paper, different configurations are proposed based on single, parallel, and serial PCRRs. To be precise, the different coupling lengths and alignments have been discussed in double and triple PCRRs in parallel and serial configurations to achieve the highest efficiency concerning the desired applications such as an add-drop filter (ADF) and a power splitter. Moreover, in the achieved optimum double and triple PCRRs, the effect of coupling radius change has been discussed.

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A new 2D plexcitonic structure based on coupled‐resonator optical waveguides is demonstrated to enhance light–matter interactions in the J‐aggregate molecules coupled to the plasmonic resonator. For this purpose, four different plexcitonic structures are defined by adjusting the coverage of dye medium over the plasmonic structures and applying forward or backward illumination direction, which are examined by the finite difference time domain method. The results show that several parameters could be used to sweep plasmon–exciton coupling in the weak, intermediate, and strong coupling regimes such as the type of structures (single or array of nanodisks), the radius of nanodisks, the direction of the incident light, and the concentration of J‐aggregate molecules. From the presented results, there are remarkable values for Rabi splitting by tuning these parameters, and it is achieved that the sample with coverage of dye in the style of the plasmonic pattern in backward illumination offers higher strength of the plasmon–exciton coupling, and then Rabi splitting is about 670 meV for the radius set to 90 nm. This amount of splitting in this new kind of plexcitonic structure can open new insight in low cost and efficient hybrid structures.