U-Shaped Fiber Optics Fabricated With A Femtosecond Laser And Integrated Into A Localized Plasmon Resonance Biosensor

A novel fiber-optic localized plasma resonance (FO-LPR) biosensor composed of a U-shaped optical fiber was proposed and demonstrated in the present study. The U-shaped optical fiber was fabricated by a femtosecond laser micromachining system. It was 105 mu m in depth measured from the surface of the polymer jacket layer and 80 mu m in width in the jacket layer. After treatment of annealing, the mean roughness of the surface was 342.24 nm as determined by AFM. The exposed surface of the U-shaped fiber was modified with self-assembled gold colloids to produce the FO-LPR sensor. Preliminary results show that the colloidal Au-modified U-shaped fiber by transmission power interrogation has a sensitivity of 1.768 x 10(-3) RIU.