Design of a plasmonic sensor based on a nanosized structure for biochemical application

Abstract

A novel design of an integrated ring cavity consisting of two merged and opposite triangles formed on a metal-insulator-metal (MIM) waveguide is suggested and analyzed for refractive index sensing application. The cavity design can be optimized provide the best sensing performance. In this work, we simulated numerically the device design by utilizing the finite-difference-time-domain (FDTD) technique in a two-dimensional (2D) structure. The detection of the refractive index changes was numerically simulated and analyzed using RSoft™. Small variations in the geometric parameters can enhance the sensitivity achieved, which we found to be 3575 nm/RIU. We believe that the sensor can achieve a resolution of 2.79×10−6. The structure proposed has a simple design for easy and compact realization, paving the way of detecting rare biochemical analytes and for finding applications in optical filters.

Multiple Fano resonances by MIM waveguide coupling whispering gallery mode resonator and application in Refractive index sensing

“…There are many methods for exciting SPPs [5][6][7][8]. Among them, SPPs excited by metal-insulator-metal (MIM) waveguides have attracted extensive attention from researchers because of their simple structure and potential application as sensors [9,10], filters [11][12][13], slow light devices [14] and so on. An MIM waveguide comprises two layers of metal with a dielectric sandwiched between them.…”

Design and analysis of high performance 1×N optical wavelength demultiplexers based on MIM waveguide with polygon resonators

“…Band-pass and band-stop filtering performance determine the quality of the applications (Cui et al 2023;Janfaza et al 2019;Korani et al 2023;Ebadi et al 2020;Pinton et al 2018;Mao et al 2017). There are many waveguide-based studies such as Mach-Zehnder interferometers (Swarnakar et al 2021;Yang et al 2022), modulators (Han et al 2022;Edelstein et al 2022), logic devices (Yang et al 2017;El Haffar et al 2022;Sreevani et al 2022;Swarnakar et al 2023), demultiplexers (Mohammadi et al 2023;Butt et al 2023), Bragg reflectors (Zeng et al 2022;Pallavi et al 2023), sensors (Bensalah et al 2022;Bahri et al 2022;Lai et al 2018;Salah et al 2021;Salah et al 2022) and directional couplers (Nanda et al 2022;Zhang et al 2020). The optical demultiplexer is based on the bandpass filter with its optimized parameters such as type and length of resonators.…”