Multiple adjustable Fano resonance based on double half ring resonator and its application

Abstract

In this paper, a compact nanostructure is proposed that includes a metal insulator metal (MIM) waveguide with a metal wall and a side-coupled half-ring resonator. The transmission characteristics of the system are studied numerically by using the finite element method (FEM). The simulation results show that double Fano resonances can be produced in the structure, and the two Fano resonances can be controlled independently by two different half rings. The position and intensity of the Fano resonance peaks can be adjusted flexibly and easily by changing the refractive index of the filling medium. The waveguide is sensitive to the refractive index of the filling medium inside the resonator and the maximum sensitivity and figure of merit (FOM) are 1260 nm/RIU and 26,000 respectively. By adding two more half-rings below, four independently adjustable Fano resonances are obtained. The structure of this paper can be used as a sensor which can detect the glucose concentration, so it has a broad application prospect in biomedical and chemical sensing fields.

A high sensitivity nanosensor of ring resonator with inner stubs for multifunctional sensing

“…In this paper, a novel refractive index sensor based on the ring resonator is proposed. The sensitivity of the structure proposed is significantly improved compared with the structures in the above literatures, [25][26][27][28][29][30][31][32][33][34] which could reach 2660 nm RIU −1 . In order to confine more SPPs in the cavity, two rectangular stubs are fabricated inside the ring resonator.…”

“…Wen et al 28) built a cascaded ring cavity and added a groove to obtain additional resonance modes, whose sensitivity is 1050 nm RIU −1 . He et al 29) designed a nanostructure with a sensitivity of 1260 nm RIU −1 in 2021, which is composed of a MIM waveguide and a half-ring resonator. Zhou et al 30) proposed a MIM waveguide consisting of a ring resonator and two stub resonators in 2021, whose sensitivity reached 1650 nm RIU −1 .…”

MIM plasmonic sensors based on single-side ring cavity with one stub and their applications

“…This resonator was demonstrated the ability to detect glucose concentration, and its maximum sensitivity and FOM can reach 1260 nm/RIU and 26000 RIU −1 , respectively. Independent adjustable of the resonances can be achieved by adding two half-rings on the lower side of the MIM waveguide, utilizing the outer radius sizes of the ring [15]. Chen et al proposed a plasmonic resonator system that can excite quintuple Fano resonances.…”

An Integrated-Plasmonic Chip of Bragg Reflection and Mach-Zehnder Interference Based on Metal-Insulator-Metal Waveguide

“…Consequently, more and more nano-scale optical devices based on MIM waveguides have been proposed and investigated, such as the optical demultiplexer, power splitter, wavelength filter, optical switch [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. It is no doubt that one would like to integrate those important functional devices into a chip for realizing photonic circuits and electronic circuits.…”