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In this paper, a compact and highly sensitive refractive index plasmonic sensor, with a metal-insulator-metal waveguide coupled with a notched hexagonal ring resonator and the stub is proposed. Structural parameters of the sensor have a key role in the sensor's sensitivity and transmission spectrum, which are investigated using the finite-difference time-domain method embedded in the commercial simulator R-Soft. The results yield a linear link with the refractive index of the material under testing and its wavelength resonances. Moreover, the maximum linear sensitivity is S = 2547 nm/RIU, its corresponding sensing resolution is 3.92 × 10 −6 RIU. Therefore, this sensor can be implemented in high-performance nano-sensors and biosensing devices. In this proposed structure, the positions of transmission peaks can be easily manipulated, by adjusting the length and width of the stub.

Various resonance modes, high transmission, and quality factor with simple design are highly desirable parameters for realizing nano-integrated plasmonic devices. In the context, a plasmonic structure consisting of two straight waveguides MIM coupled one central defective circular nano-disk resonator (CNDR) is proposed in this work. The insulator and metal of the proposed plasmonic filter are air and silver, respectively. The plasmonic filter is designed and investigated numerically by using the finite difference time domain method (FDTD). Our simulation results indicate that the proposed plasmonic filter has two transmission peaks with a maximum transmission equal to 80 and 70 percent. The advantages of the proposed filter are the various resonance modes with high transmission peaks and high quality factor which reaches 35.27. In view of these features, our proposed structure of plasmonic filter has the potential to be employed in various devices such as plasmonic demultiplexers and sensors for optical communication purposes.

In this paper, a high-sensitivity plasmonics waveguide system using the finite-difference-time-domain method for numerical simulations is proposed to develop a novel Plasmon glucose sensor with a high transmission, which consists of a notched ring nano-resonator coupled to multi-stub waveguides. The metal and insulator of the proposed plasmonic biosensor are silver and air, respectively. The proposed design has a single transmission peak in the mid-infrared range, with a high transmission based on obtained simulation results. The sensitivity is a crucial parameter for characterizing sensor performance. Increasing sensitivity can improve the detection limit. The advantages of the proposed structure are the resonance wavelength with a linear relationship with the refractive index (RI) and high sensitivity as 4508 nm/RIU. We investigate the effect of different structural parameters of multiple stubs on their sensitivity and transmission spectra. By considering these features, the proposed biosensor has the potential for high sensitivity and transmission and easy manipulation of the resonance wavelength for different RI. It will be helpful in compact optical devices for optical communications integrated photonics circuits and pave the way for the future of the plasmonic structure.

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