Bio-Sensing by Mach–Zehnder Interferometer Comprising Doubly-Corrugated Spoofed Surface Plasmon Polariton (DC-SSPP) Waveguide


The paper describes the design and analysis of a Mach-Zehnder interferometer (MZI) structure consisting of doubly-corrugated spoofed surface plasmon polariton (DC-SSPP) waveguide. The dependence of part modification on the dielectric loading of the DC-SSPP structure causes the output from both arms to interfere and enhances features on the transmission spectrum of the MZI. The paper uses a mathematical model to predict the phase accumulation of THz signals travelling through every arm of the MZI with varied sample loadings. HFSS simulation has been performed to verify the theoretical modeling and manufacture additional refined results. The paper demonstrates that compared with single-armed SSPP waveguide, the proposed MZI structure shows significant shift of the transmission maxima and minima with high quality factors for the transmission peaks when different materials are loaded. The paper conjointly demonstrates that the proposed DC-SSPP MZI structure can be probably employed in tag-free bio-molecular sensing. The highly localized $Ehbox--M$ field at frequencies close to SSPP resonance is shown to cut back the sample amount required to provide interference patterns while not affecting the selectivity of the sensing structure.

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