Análisis de propagación modal en guías de onda para el diseño de biosensores fotónicos de onda evanescente

Jesús Álvarez Guerrero; Jhon Jairo Vejar Caballero; Byron Medina Delgado; Jhonattan Córdoba Ramírez; Ferney Orlando Amaya Fernández

doi:10.24054/rcta.v2i46.4122

Authors

Jesús Álvarez Guerrero Universidad Libre https://orcid.org/0000-0001-8226-3258
Jhon Jairo Vejar Caballero Universidad Francisco de Paula Santander https://orcid.org/0009-0005-5922-234X
Byron Medina Delgado Universidad Francisco de Paula Santander https://orcid.org/0000-0003-0754-8629
Jhonattan Córdoba Ramírez Universidade Federal de Minas Gerais https://orcid.org/0000-0002-8883-4223
Ferney Orlando Amaya Fernández Universidad Pontificia Bolivariana https://orcid.org/0000-0001-7215-0196

DOI:

https://doi.org/10.24054/rcta.v2i46.4122

Keywords:

photonic biosensors, integrated photonics, photonic waveguides

Abstract

This paper presents a modal propagation analysis of Strip and Rib waveguides with silicon and SU-8 cores, aimed at designing evanescent wave photonic biosensors. The objective was to determine structural configurations that optimize device sensitivity, focusing on single-mode and bimodal operating conditions. The study was conducted through numerical simulations using the Finite Element Method in COMSOL Multiphysics. Various combinations of materials, core heights of 220 and 600 nm, and operating wavelengths of 633 and 1550 nm were analyzed to evaluate the behavior of TE and TM propagation modes and the variation of the effective refractive index with respect to the waveguide width. The main outcome is a design table summarizing the optimal core width ranges for each configuration, serving as a practical tool for developing highly sensitive and manufacturable biosensors. Additionally, the presented methodology can be applied to the design of integrated photonic circuits in diverse fields such as telecommunications and optical computing.

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