Enhanced extraordinary terahertz transmission through coupling between silicon resonators

Area of Science:

• Optics and Photonics
• Electromagnetism
• Materials Science

Background:

• Mie resonance coupling enables electromagnetic field localization using low-loss silicon particles.
• Extraordinary optical transmission (EEOT) is a phenomenon observed in subwavelength hole arrays.
• Terahertz (THz) technology requires efficient components for signal manipulation.

Purpose of the Study:

• To investigate the use of Mie resonance coupling in silicon particles for enhanced THz transmission.
• To analyze the mechanism behind enhanced extraordinary optical transmission (EEOT) in silicon particle-hole array structures.
• To explore the tunability of Mie resonance coupling and THz EEOT for practical applications.

Main Methods:

• Numerical simulations were employed to analyze current distribution, magnetic field, and Poynting vector.
• The study focused on silicon particles placed symmetrically around subwavelength hole arrays.
• The effect of particle size relative to wavelength (r/λ = 0.06) on transmission was investigated.

Main Results:

• Silicon particles acting as antennas strongly localized the electromagnetic field through Mie resonance coupling.
• EEOT was significantly enhanced, with factors of 154-fold (resonator-hole) and 629-fold (resonator-resonator) compared to hole-only structures.
• The Mie resonance coupling and induced THz EEOT demonstrated tunability over a wide frequency range.

Conclusions:

• The proposed silicon particle-based structure effectively enhances THz EEOT via Mie resonance coupling.
• The findings offer a valuable reference for the miniaturization of terahertz systems.
• The tunability of the system suggests potential for versatile THz device development.