Analysis of Scaling Law and Figure of Merit of Fiber-Based Biosensor

Abstract EN

This paper presents a normalized transmitted signal (NTS) of a fiber-based sensor using gold nanorods as the plasmon excitation medium of the evanescent wave.

The NTS and the refractive index (RI) sensitivity is calculated as a function of the gold aspect ratio (R), the RI of the sensing medium, and a scaling parameter given by the ratio of the fiber length and its diameter.

Finally, the optimal value of gold aspect ratio is calculated to be R = (3.0–4.0) for maximum figure of merits (FOMs) defined by the ratio of the refractive index sensitivity and the full width at half maximum.

The scaling laws and the FOM presented in this paper may serve as the guidelines for optimal designs in fiber-based nanosensors.