Abstract
In this paper, we look at the work of a classical plasmon-induced transparency (PIT) based on metasurface, including a periodic lattice with a cut wire (CW) and a pair of symmetry split ring resonators (SSR). Destructive interference of the ‘bright-dark’ mode originated from the CW and a pair of SSRs and resulted in a pronounced transparency peak at 1.148 THz, with 85% spectral contrast ratio. In the simulation, the effects of the relative distance between the CW and the SSR pair resonator, as well as the vertical distance of the split gap, on the coupling strength of the PIT effect, have been investigated. Furthermore, we introduce a continuous graphene strip monolayer into the metamaterial and by manipulating the Fermi level of the graphene we see a complete modulation of the amplitude and line shape of the PIT transparency peak. The near-field couplings in the relative mode resonators are quantitatively understood by coupled harmonic oscillator model, which indicates that the modulation of the PIT effect result from the variation of the damping rate in the dark mode. The transmitted electric field distributions with polarization vector clearly confirmed this conclusion. Finally, a group delay of 5.4 ps within the transparency window is achieved. We believe that this design has practical applications in terahertz (THz) functional devices and slow light devices.
Highlights
Plasmon-induced transparency (PIT) is achieved with the same properties of the traditional EIT that allow a distinct transparency window in broad absorption or transmission spectrum [1], known as the analogue of electromagnetically induced transparency (EIT-like) [2,3,4,5]
We presented a design of a classical Al-based metasurface consisting of a cut wire (CW) and a symmetric split ring resonator (SSR)
The destructive interference of the ‘bright-dark’ mode originated from direct-excited plasmon resonance in the CW and the coupling excited resonance in the split ring resonators (SSR) pair
Summary
Plasmon-induced transparency (PIT) is achieved with the same properties of the traditional EIT that allow a distinct transparency window in broad absorption or transmission spectrum [1], known as the analogue of electromagnetically induced transparency (EIT-like) [2,3,4,5]. The ‘dark’ mode can be excited by ‘bright’ mode with the near-field coupling when close proximity resonance frequency in the relative modes, which results in an extremely narrow window in reflection or transmission spectrum that we call EIT-like [17,19]. Xiao et al integrated a continuous graphene strip into a metal-based terahertz metasurface and actively tuned the damping rate of the ‘dark’ mode resonators to achieve active modulation of the EIT-like response [39]. This method perfectly realizes expedient tuning of the graphene resonator, but the complicated structure is still an issue. We believe that the design has practical applications in slow light devices and terahertz functional devices
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