Plasmon-Induced Transparency Based on Triple Arc-Ring Resonators

Abstract

This paper presents a plasmon-induced transparency (PIT) using an easy-fabricating metamaterial composed of three pieces of metallic arc-rings on top of a dielectric substrate. The transmission of the transparent peak of 1.32 THz reaches approximately 93%. The utilization of the coupled Lorentzian oscillator model and the distribution of electromagnetic fields together explain the cause of the transparent peak. The simulation results further demonstrate that the bandwidth of the transmission peak can be narrowed by changing the sizes of the arc-rings. Moreover, an on/off effect based on the transparent peak is discussed by introducing photosensitive silicon into the air gaps of the suggested metamaterial structure.

Dual-Band Perfect Metamaterial Absorber Based on an Asymmetric H-Shaped Structure for Terahertz Waves

“…The resonance frequency for the central strip resonator was 5.3 THz with the absorptivity 35.35% and the quality factors 22 (the Q factor refers to the ratio of the center frequency to the full width at half maximum of a resonance), while the resonance frequency for the side strip resonator was also 5.3 THz with the absorptivity 83.13% and the quality factors (Q) 90. We can see that every resonator can provide one resonance mode with identical resonance frequency, but significantly different absorption strength and quality factors through comparative analyses, as described in References [37,38,39,40], there were two different excitation pathways of the resonance modes. As a composite structure consisting of the central strip and the side asymmetric strips, the resonance suppressed in the symmetric case was induced when the symmetry was broken.…”

Plasmon-induced transparency effect for ultracompact on-chip devices

“…There are also some deformation structures designed for PIT effect by adopting ring resonators [58][59][60]. Huang et al both experimentally and theoretically introduced localized asymmetric SRRs inserted into the periodic hole arrays [61].…”

Symmetry-broken square silicon patches for ultra-narrowband light absorption

“…The introducing of off-normal incidence will break the symmetry of the incident light, which permits the coupling between the incident plane wave and modes that are inaccessible at normal incidence due to a mismatch in their symmetries, thus narrow resonance peaks can be achieved due to the excitation of symmetry-protected modes 26–29 . To date, the strategies of symmetry-breaking have attracted increasing interests due to their diverse optical functions for various applications, such as transmission filters 27–31 , high quality resonance 32–35 , plasmon-induced transparency 36–39 , directional couplers 40 , second-order nonlinear effects 41,42 , chiral metamaterials 43,44 , and plasmon mode splitting 45,46 . However, there are only few researches on narrowband light absorption enhancement by using the symmetry-broken metamaterials.…”