Design of a Tunable Plasmonic Filter with Ultra-high Q-Factor Based on Hexagonal Cavity
Paper ID : 1427-ICNS
Sara Gholinezhad Shafagh *1, Leila Hajshahvaladi2, Hassan Kaatuzian3, Mohammad Danaie4
1Photonics Research Lab.(PRL), Electrical Engineering Department, Amirkabir University of Technology, Tehran, Iran
2Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran
3Professor of Electrical Engineering Dept., Amirkabir University of Technology (Tehran Polytechnic)
4Faculty of Electrical and Computer Engineering, Semnan University, Semnan, Iran
In this paper, a novel design of a tunable plasmonic filter with ultra-high quality factor (Q-factor) based on the hexagonal cavity is proposed, which is coupled to a metal-insulator-metal (MIM) waveguide via a narrow bus waveguide. This structure is numerically simulated using the finite difference time domain (FDTD) method. The proposed structure acts as a plasmonic notch filter, which has one resonance dip at 643 nm with an ultra-high Q-factor of 321 and ultra-small full width at half maximum (FWHM) of 2 nm. Due to its sharp transmission spectrum, this structure can be utilized for ultra-high Q-factor multi-functional plasmonic applications. Obtained results represent that by engineering the structure geometry, can be controlled the Q-factor and sensitivity of the proposed filter to the environment. The Q-factor and FWHM values are the highest in comparison with the reported similar works in the literature. Hence, it is a good candidate for various applications in advanced plasmonic sensing with high Q-factor in all-optical ultra-compact circuits and devices.
Surface plasmon polariton (SPP); Plasmonic filter; Quality factor; Drude model; Hexagonal cavity
Status : Abstract Accepted (Poster Presentation)