Slow-light application using dielectrics in a metallic terahertz plasmonic waveguide.

Area of Science:

• Photonics and Plasmonics
• Terahertz (THz) Technology
• Materials Science

Background:

• Metallic plasmonic waveguides are key components in manipulating light at the nanoscale.
• Terahertz (THz) technology requires efficient methods for controlling and guiding THz waves.
• Subwavelength structures offer unique electromagnetic properties.

Purpose of the Study:

• To propose and analyze a novel metallic plasmonic waveguide for THz applications.
• To investigate the influence of dielectric materials on waveguide properties.
• To explore the slow-light capabilities of the proposed waveguide design.

Main Methods:

• Numerical simulation of a 1D periodically arranged metallic pillar waveguide.
• Analysis of guided resonant mode properties with varying dielectric refractive index (n).
• Calculation of dispersion relations, group velocity, and examination of transmission phase and electric field profiles.
• Application of the Drude model to fit dielectric function parameters.

Main Results:

• Resonant modes are strongly dependent on the dielectric material's refractive index.
• The waveguide exhibits significant slow-light properties, confirmed by group velocity calculations.
• Dispersion relations confirm the plasmonic response of the guided modes.
• Electric field profiles and transmission phase support the observed slow-light phenomena.

Conclusions:

• The proposed dielectric-metal-based plasmonic waveguide effectively supports slow-light phenomena in the THz regime.
• This design holds potential for applications in THz buffers, storage devices, sensors, and detectors.
• The tunability of resonant modes via dielectric properties offers design flexibility for specific THz applications.