The sensing characteristics of plasmonic waveguide with a ring resonator

Abstract

A surface plasmon polaritons (SPPs) refractive index sensor which consists of two metal-insulator-metal (MIM) waveguides coupled to each other by a ring resonator is proposed. The transmission properties are numerically simulated by finite element method. The sensing characteristics of such structure are systematically analyzed by investigating the transmission spectrum. The results indicate that there exist three resonance peaks in the transmission spectrum, and all of which have a linear relationship with the refractive index of the material under sensing. Through the optimization of structural parameters, we achieve a theoretical value of the refractive index sensitivity as high as 3460nmRIU(-1). Furthermore, this structure can also be used as a temperature sensor with temperature sensitivity of 1.36nm/°C. This work paves the way toward sensitive nanometer scale refractive index sensor and temperature sensor for design and application.

WITHDRAWN: Tuning the Fano resonances in a single defect nanocavity coupled with a plasmonic waveguide for sensing applications

“…The width and height of the defect are w (w L) and h, respectively. As is well known, the dispersion relation of the fundamental TM mode in the MIM waveguide can be written as [4,[10][11][12]23] A c c e p t e d M a n u s c r i p t…”

“…Both SPPs and localized surface plasmon resonances (LSPR) exhibit very interesting properties for sensing applications due to their high degree of tenability and their A c c e p t e d M a n u s c r i p t susceptibility to the dielectric properties of the surrounding environment [5]. In the field of refractive index sensing, many research groups have focused on Fano resonance tuning in order to narrow the full width at half maximum (FWHM) [5][6][7][8][9] and others have concerned about improving the refractive index sensitivity [10][11][12][13][14], all the research purposes are to reach lower detection limits. Fano resonance in metallic nanostructures is a coupling effect which results from the interaction of a narrow dark resonant mode with a broad bright one, it exhibits sharp and asymmetric spectral line shapes together with strong field enhancements [15], and so Fano resonance significantly reduces the FWHM of the plasmon modes.…”

Tunable multimode electromagnetically induced absorption transmission in metal-insulator-metal resonators

“…2-4 Optical elements based on SPPs have been widely researched both in theory and experiment, such as filters, [5][6][7] modulators, 8 switches, 9-12 sensors [13][14][15] and so on. For instance, Wang et al 16 proposed a plasmonic filter based on a ring resonator.…”

A multifunction filter based on plasmonic waveguide with double-nanodisk-shaped resonators

“…Based on SPPs, a number of metalinsulator-metal (MIM) structures have been numerically simulated and/or experimentally demonstrated, such as plasmonic filter [2][3][4][5], wavelength demultiplexing structures [1,6], Mach-Zehnder interferometers [7,8], sensors [9,10], nanolenses [11], splitters [12], and Y-shaped combiners [13]. These devices may be fabricated and applied in future optical communications and integrated optical circuits with the development of nanofabrication and nanocharacterization capabilities [5].…”