Title :
Lossy Mode Resonance-based pH sensor using a tapered single mode optical fiber coated with a polymeric nanostructure
Author :
Socorro, A.B. ; Del Villar, I. ; Corres, J.M. ; Arregui, F.J. ; Matías, I.R.
Author_Institution :
Electr. & Electron. Eng. Dept., Univ. Publica de Navarra (UPNA), Pamplona, Spain
Abstract :
This contribution presents a pH sensor based on the combination of two technologies: tapered standard-single mode optical fiber (S-SMF) and an electromagnetic resonance phenomenon called Lossy Mode Resonance (LMR). This last phenomenon is produced by coating the optical structure with a thin polymeric film, which for specific values of the coating refractive index and thickness causes a maximum coupling of light guided in the tapered S-SMF region. Layer-by-layer electrostatic self assembly technique was used for the fabrication of a polymeric sensing nanostructure. The construction process was optimized in order to visualize the LMR behavior with a device length of 5 mm. The sensing combination produces a 250 nm wavelength-shift and a 20 dB attenuation variation of the LMR when varying the pH from 4 to 6.
Keywords :
antireflection coatings; chemical sensors; fibre optic sensors; nanofabrication; nanostructured materials; optical films; polymer films; self-assembly; spray coatings; thin film sensors; LMR behavior; electromagnetic resonance phenomenon; gain 20 dB; layer-by-layer electrostatic self assembly technique; light guided maximum coupling; lossy mode resonace-based pH sensor; optical structure coating; polymeric sensing nanostructure fabrication; refractive index coating; size 5 mm; tapered S-SMF; tapered standard-single mode optical fiber; thin polymeric film; wavelength 250 nm; Coatings; Optical fiber sensors; Optical fibers; Optical surface waves; Polymers;
Conference_Titel :
Sensors, 2011 IEEE
Conference_Location :
Limerick
Print_ISBN :
978-1-4244-9290-9
DOI :
10.1109/ICSENS.2011.6127143
