Terahertz Transparent Plasmonic Waveguide Nanofilter Based on Monolayer MoS2 Ring Resonator

In this paper, the structure of a plasmonic waveguide nanofilter based on monolayer MoS2 ring resonator is proposed and investigated. The structure performance is for a part of terahertz frequencies. Due to the low absorption and reflection of monolayer MoS2, considerable wave transmission and as a result, transparency, is provided. Filtering response caused by the proposed waveguide filter is resulted by the resonator which makes possible the coupling of the input and output nanoribbon waveguides. The structure operation has been simulated using the numerical method of finite difference time domain. The values of coupling efficiency, bandwidth at half of maximum, and quality factor, in operating wavelength of 1255 μm are respectively 0.78, 162 μm, and 7.7. The operating wavelength complies with the second resonance mode of the resonator. Also, the sensitivity of various structural indices in respect to manufacturing telorance is investigated. The proposed structure can have exnetsive application as a transparent electrode in photonic integrated circuits.