Plasmonic micro-channel based highly sensitive biosensor in visible to mid-IR

A novel hybrid multimode interferometer for sensing applications operating with both TE and TM polarizations simultaneously is proposed and numerically demonstrated. The simulations were performed assuming an operating wavelength of 633 nm with the goal of future use as a biosensor, but its applications extend beyond that area and could be adapted for any wavelength or application of interest. By designing the mutimode waveguide core with a low aspect ratio, the confinement characteristics of TE modes and TM modes become very distinct and their interaction with the sample in the sensing area becomes very different as well, resulting in high device sensitivity. In addition, an excitation structure is presented, that allows good control over power distribution between the desired modes while also restricting the power coupled to other undesired modes. This new hybrid TE/TM approach produced a bulk sensitivity per sensor length of 1.798 rad and a bulk sensitivity per sensor area of 2.140 rad , which represents a much smaller footprint when compared to other MMI sensors, contributing to a higher level of integration, while also opening possibilities for a new range of MMI devices.

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“… 2019 ), Leaky Waveguides (Gupta and Goddard 2021 ), Surface Plasmon Resonance (SPR) (Haider et al. 2021 ; Ly et al. 2021 ; Srivastava et al.…”

Section: Introductionmentioning

confidence: 99%

Design of a novel hybrid multimode interferometer operating with both TE and TM polarizations for sensing applications

Isayama

Hernández-Figueroa

2023

Opt Quant Electron

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“…[ 14 ]. Researchers recently introduced different metal-coated plasmonic sensors, ensuring excellent sensing characteristics [ 18 , 19 , 20 , 21 , 22 ]. In 2019, Podder et al proposed a hybrid core fused silica-based chemical sensor to identify the concentration level of sulfuric acid [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Design of a Highly Sensitive Photonic Crystal Fiber Sensor for Sulfuric Acid Detection

et al. 2022

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In this research, a photonic crystal fiber (PCF)-based sulfuric acid detector is proposed and investigated to identify the exact concentration of sulfuric acid in a mixture with water. In order to calculate the sensing and propagation characteristics, a finite element method (FEM) based on COMSOL Multiphysics software is employed. The extensive simulation results verified that the proposed optical detector could achieve an ultra-high sensitivity of around 97.8% at optimum structural and operating conditions. Furthermore, the proposed sensor exhibited negligible loss with suitable numerical aperture and single-mode propagation at fixed operating conditions. In addition, the circular air holes in the core and cladding reduce fabrication complexity and can be easily produced using the current technology. Therefore, we strongly believe that the proposed detector will soon find its use in numerous industrial applications.

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