Enhanced extraordinary terahertz transmission through coupling between silicon resonators

By using Mie resonance coupling effects, low-loss silicon particles as receiving or transmitting antennas can strongly localize the electromagnetic field. Enhanced extraordinary optical transmission (EEOT) is generated by placing two such silicon particles symmetrically on both sides of subwavelength hole arrays in the terahertz (THz) region. When the hole radius r is 17 times smaller than the resonance wavelength lambda (r/lambda = 0.06), the enhancement factors of the resonator-hole and the resonator-resonator coupling structures are 154- and 629-fold compared to that of the hole-only structure, respectively. The current distribution, magnetic field and Poynting vector are numerically simulated to reveal the mechanism of the proposed structure. Moreover, the Mie resonance coupling and the induced THz EEOT can be tuned in a wide frequency range. Our results provide a reference for the miniaturization of THz systems.

Automated summary

By utilizing Mie resonance coupling effects, low-loss silicon particles can be used as receiving or transmitting antennas to localize the electromagnetic field in the terahertz region. This leads to enhanced extraordinary optical transmission (EEOT) when two silicon particles are symmetrically placed on both sides of subwavelength hole arrays. The proposed structure exhibits enhanced factors of 154 and 629 compared to the hole-only structure, and the Mie resonance coupling and induced THz EEOT can be adjusted over a wide frequency range.