High-Sensitivity Sensing Based on Plasmon-Induced Transparency

Abstract

High-sensitivity sensing based on plasmon-induced transparency (PIT) in a rectangular resonator has been investigated in detail. Multimode theory is introduced to explain the redshift and blueshift of the transmission spectrum by adjusting a structural parameter (w or h). In sensing applications, the sensitivity of the proposed structure is about 800 nm/RIU, and its figure of merit (FOM) is as high as 17280. In addition, the influences of structural parameters on FOM are researched in detail. The results indicate that structural parameters play important roles in optimizing the sensing performance, and the length ðhÞ is more sensitive than the width ðw Þ for FOM. The plasmonic configuration has the advantages of easy fabrication and compactness, which may find important applications in highly integrated optics devices, optical communication, and sensitive nanometerscale refractive index sensors.

Investigation on Plasmon Induced Transparency and Its Application in an Mim Typecompound Plasmonic Waveguide

“…Figure 9(c) shows that the dependence of the resonant wavelength of the transmission dip II, peak I, and dip III on the refractive index n is almost linear. The calculated sensitivities defined by S = Δλ/Δn [38], corresponding to dip II, peak I, and dip III are 1261 nm/RIU, 1309 nm/RIU and 1379 nm/RIU, respectively, which is better than some reported results [1,6,21,26,39] as shown in Table 1. At last, it is known that the PIT effect is confirmed to support the slowlight effects in the field of nano-integrated optics.…”

“…Here, the slowlight effects of the proposed waveguide are also studied. The group index is usually used to describe the slow light effect, which is defined as [18,39]: [6] 800, 590 Ref. [21] 1100 Ref.…”

“…SPPs can propagate along the metaldielectric interface and decay exponentially on both sides of the interface. A large number of studies have shown that SPPs can break through the limitation of diffraction limit and confine electromagnetic wave to sub-wavelength size [6,7]. Therefore, studying the transmission characteristics of SPPs can provide a new idea for the miniaturization and high-density integration of optoelectronic devices.…”

Plasmonic induced transparency in a coupled system composed of metal-insulate-metal stub and trapezoid cavity resonator

“…where ε ∞ is the relative permittivity at infinite frequency with the value of 3.7, ω p is the plasma frequency which is set as 1.38×10 16 Hz, γ is the damping frequency of the oscillations and the value is 2.73×10 13 Hz, and ω is the angular frequency of the incident light [19]. The transmission spectrum and resonance modes at different wavelengths were investigated with the parameters set as: L 1 =50nm, L 2 =250nm, H =300nm and g =20nm.…”

“…Moreover, there are also some articles refer to PIT systems based on ring resonators [7] and F-P resonators [8][9][10]. Some studies have focused on rectangular resonators which can provide unique properties by their novel designs [11][12][13]. On the basis of these designs, some new structures were proposed to implement more functionality by modulating the offset positions of resonators [14] or rotating the angles of the ring resonators [15].…”