Stress Detection Using Polymer Optical Fiber with FRET Pair Dyes

Abstract

A stress sensor based on a dye-doped polymeric optical fiber was proposed to detect stress by simple comparison of two luminescence peaks from a pair organic dyes. Coumarin 540A (donor) and Rhodamine 6G (acceptor) were doped in the core and cladding of the polymer optical fiber, respectively. By exciting the donor dye in the core, the change in the emission spectrum upon variation in the fiber bending diameter was evaluated. From a comparison with emission spectrum of acceptor dye, it is shown that the sensitivity of the sensor is controllable by optimization of the waveguide parameters.