4.6 Article

Optical Ultra-Wideband Nano-Plasmonic Bandpass Filter Based on Gap-Coupled Square Ring Resonators

Journal

IEEE ACCESS
Volume 11, Issue -, Pages 106095-106102

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2023.3318878

Keywords

BPF; MIM; ring resonator; surface plasmon polariton; subwavelength; UWB

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In this study, an ultra-wideband optical bandpass filter based on nanoplasmonic structure is designed and analyzed. The filter utilizes a metal-insulator-metal slot waveguide and resonators to achieve excellent ultra-wideband characteristics. The characteristic parameters of the filter structure are thoroughly analyzed using CAD simulation software, and the design is optimized by increasing the number of coupled resonators.
In this work, an ultra-wideband (UWB) optical bandpass filter (BPF) based on nanoplasmonic structure is designed and thoroughly analyzed. The proposed BPF structure encompasses asymmetric metal-insulator-metal (MIM) slot waveguide that incorporates a gap-coupled series and parallel square ring resonators (SRRs). The characteristic parameters of the MIM waveguide structure are analyzed with a full-wave analysis and a conformal mapping technique (CMT) using a CAD simulation software. These include the normalized propagation constant, the propagation length, and the characteristic impedance. The UWB feature of the proposed structure is mainly dictated by the coupling gaps that combine the feed line with the resonators. Increasing the sequential number of the coupled resonators enhances the optical UWB feature of the proposed design. Two structures with three and five resonators are presented to illustrate the UWB characteristics within the 1235.74-1942 nm, and 1340-2200 nm ranges, respectively. In both cases, the return loss is shown to be higher than 10dB. The proposed nanoplasmonic UWB filter in this work has the potential to replace narrow-bandwidth devices involved in multi-band transmission systems and high-density photonic integrated circuits. The outcomes of this research contribute to the advancement of UWB filter technology for next-generation communication systems and photonics.

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