Angular characteristics of a multimode fiber surface plasmon resonance sensor under wavelength interrogation

TL;DR

This paper presents a theoretical analysis of a multimode fiber surface plasmon resonance sensor's angular characteristics, proposing a model to optimize sensor performance by adjusting incident angles and addressing issues in prior studies.

Contribution

A compact theoretical model for predicting resonance wavelength shifts based on incident angles in multimode fiber SPR sensors is introduced, improving sensor design and performance.

Findings

Optimizing incident angles enhances sensor sensitivity.

The model accurately predicts resonance wavelength shifts.

Identifies issues in previous SPR sensor reports.

Abstract

In this paper the angular characteristics of a multimode fiber SPR sensor are theoretically investigated. By separating the contributions of beams incident at different angles, a compact model is presented to predict the shift of the resonance wavelength with respect to the angle and the environmental refractive index. The result suggests that the performance of conventional fiber SPR sensors can be substantially improved by optimizing the incident angle. Furthermore, our investigation suggests some problems in previous reports.