Design of Optical Filters with Flat-on-Top Transmission Lineshapes Based on Two Side-Coupled Metallic Grooves |
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| Authors: | Xu-Sheng Lin Sheng Lan |
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| Affiliation: | 1. Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou, 510006, China
2. School of Electronic and Information Engineering, Guangdong Polytechnic Normal University, Guangzhou, 510665, China
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| Abstract: | We investigate theoretically and numerically the resonant transmission through side-coupled metallic grooves. In the framework of coupled mode theory (CMT), a single metallic groove can be considered as a lossy optical resonator and two metallic grooves coupled via tunneling effect can be treated as a second-order cascade resonator. The relationship between the transmission lineshape of the coupled grooves and the cross-coupling between the grooves is analyzed by CMT. It is found that a flat-on-top lineshape can be obtained when the cross-coupling is equal to the total decay rate of the groove mode. Predictions based on the CMT analysis are in good agreement with the simulation results based on the finite-difference time-domain technique. |
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