Evanescent wave optical fiber sensor using adsorption LB films

An optical fiber sensor for albumin detection has been fabricated and tested. The adsorption Langmuir–Blodgett (LB) method was employed to form organic thin films on the optical fiber. The spectral change can be monitored by the interaction between the evanescent light from the fiber core and the adsorption LB films. A relatively high sensitivity and linear relationship between the spectral change and the albumin concentration were obtained.