Abstract
Plasmon-induced transparency is an efficient way to mimic electromagnetically induced transparency, which can eliminate the opaque effect of medium to the propagating electromagnetic wave. We proposed an aperture-side-coupled asymmetric bowtie structure to realize on-chip plasmon-induced transparency in optical communications band. The plasmon-induced transparency results from the strong coupling between the detuned bowtie triangular resonators. Either of the resonator works as a Fabry-Perot cavity with compact dimensions. The transparent peak wavelength can be easily controlled due to its strong linear relation with the resonator height. The ratio of absorption valley to the transparent peak can be more than 10 dB. Moreover, with excellent linearity of shifting wavelength to sensing material index, the device has great sensing performance and immunity to the structure deviations.
Highlights
Electromagnetically induced transparency (EIT) effect, which results from quantum destructive interference between two pathways in three-level atomic systems [1, 2], shows tremendous potential applications in slow light propagation [3, 4], nonlinear optics [5], and optical storage [6]
The EIT effect is very sensitive to broadening due to atomic motion
Kinds of configurations have been proposed to mimic EIT-like transmission without the demand of rigorous experimental conditions, including coupled micro-resonators [8–12], split-ring, and metamaterials [13–16] composed of dielectric and metal materials
Summary
Induced transparency (EIT) effect, which results from quantum destructive interference between two pathways in three-level atomic systems [1, 2], shows tremendous potential applications in slow light propagation [3, 4], nonlinear optics [5], and optical storage [6]. In an EIT system, quantum interference effect reduces light absorption over a narrow spectral region, arising a sharp resonance of nearly perfect transmission within a broad absorption profile [7]. Kinds of configurations have been proposed to mimic EIT-like transmission without the demand of rigorous experimental conditions, including coupled micro-resonators [8–12], split-ring, and metamaterials [13–16] composed of dielectric and metal materials. We propose a novel detuned resonators structure to obtain PIT transmission in MIM waveguides. Owing to the sensitive and linear response of transparent peak wavelength to structural parameters and medium inside the waveguide, the proposed device enables PIT-based refractive index sensing. With compact and easy-tomake structure, the device could be of great significance in on-chip photonic integrations
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