Surface waveguide mode resonance technology based on optical fiber

Abstract

Surface waveguide resonance mode is a new form of surface optical waveguide-matter interaction that has emerged in recent years, with unique manipulable properties and extremely high sensitivity, which has very great potential for surface optical field manipulation and light-matter interaction analysis. Tilted fiber Bragg grating (TFBG), due to the introduction of a small inclination angle in the fiber, allows the forward transmitted core mode to be coupled with the reverse transmitted core mode, cladding mode and radiation mode, forming a complete resonant envelope with a narrow spectral bandwidth, high sensitivity and high resolution. Surface plasmon resonance (SPR) and lossy mode resonance (LMR) are two unique physical mechanisms for the interaction of light with nanofilms of materials with different dielectric constants. Compared with SPR, lossy mode resonance (LMR) combines metal oxide and polymer films with optical fiber and has some remarkable features and advantages such as wide selection of materials, high sensitivity, and easy tuning. This project intends to coat different metal oxide films as well as polymer films on the surface of TFBG fiber based on tilted fiber grating to produce LMR phenomena on the surface of TFBG fiber as a basis for the design of various physical and chemical sensors