Electromagnetically Induced Transparency and Refractive Index Sensing for a Plasmonic Waveguide with a Stub Coupled Ring Resonator

• Published in: Plasmonics (Norwell, Mass.) Vol. 12; no. 4; pp. 1007 - 1013
• Main Authors: Zhang, Z. D., Wang, R. B., Zhang, Z. Y, Tang, J., Zhang, W. D., Xue, C. Y., Yan, S. B.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.08.2017; Springer Nature B.V
• Subjects: Asymmetry; Biochemistry; Biological and Medical Physics; Biophysics; Biotechnology; Chemistry; Chemistry and Materials Science; Coupled modes; Dynamic control; Finite element method; Insulators; Nanotechnology; Refractivity; Resonators; Sensitivity; Finite element method; Surface plasmon polaritons; Refractive index sensor; Metal-insulator-metal waveguide
• ISSN: 1557-1955; 1557-1963
• DOI: 10.1007/s11468-016-0352-9

A plasmonic refractive index sensor based on electromagnetically induced transparency (EIT) composed of a metal-insulator-metal (MIM) waveguide with stub resonators and a ring resonator is presented. The transmission properties and the refractive index sensitivity are numerically studied with the finite element method (FEM). The results revealed an EIT-like transmission spectrum with an asymmetric line profile and a refractive index sensitivity of 1057 nm/RIU are obtained. The coupled mode theory (CMT) based on transmission line theory is adopted to illustrate the EIT-like phenomenon. Multiple EIT-like peaks are observed in the transmission spectrum of the derived structures based on the MIM waveguide with stub resonator coupled ring resonator. To analyze the multiple EIT-like modes of the derived structures, the H z field distribution is calculated. In addition, the effect of the structural parameters on the EIT-like effect is also studied. These results provide a new method for the dynamic control of light in the nanoscale.