Modeling a high-performance broadband mid-infrared modulator using graphene-based hybrid plasmonic waveguide
Article Type:
Research/Original Article (دارای رتبه معتبر)

A graphene-based-hybrid plasmonic waveguide (GHPW) with a unique geometric structure is designed for surface plasmon polariton guidance and modulation at the frequency area of 10 to 30 THz. The GHPW consists of a graphene layer in the middle, a high-density polyethylene (HDPE) gating layer, two interior dielectric delimiter layers, and two exteriors semi-cylinder Germanium substrates symmetrically embedded on both edges of the graphene. Because of the matchless semi-cylinder structure design, the electromagnetic wave interaction with graphene ultimate subwavelength SPPs strong confinement with long propagation length. Small normalized mode area of ~10-4 and long propagation length of 10.67-28.92 μm at Fermi energy of 1.0 eV is attained for SPPs modes propagation of the GHPW in the frequency bound of 10-30 THz and semi-cylinder radius R > 450 nm, respectively. By controlling the graphene Fermi energy, it is found that the structure has a modulation depth higher than 20 % for the frequency band of 10-30 THz and arrives at the peak of approximately 100 % at a frequency greater than 28.75 THz. To benefit from the great broadband MIRpropagation and modulation efficiency, the GHPW may promise different MIR waveguides, modulators, photonic, and optoelectronic devices.

Journal of Interface, Thin Film and Low Dimension Systems, Volume:5 Issue: 2, Winter-Spring 2022
505 to 515  
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