Fig. 1. The optical set-up for polymer waveguide fabrication

Fig. 2. Characterization of gold nanoparticles

Fig. 3. SEM image of fiber-hydrogel polymer waveguide-fiber sensor

Fig. 4. Absorption spectra of acriflavine hydrochloride detected by OFWF sensor and commercial UV-Vis spectrometer

Fig. 5. Spectrum of white light source

Fig. 6. Optical set-up for fluorescence spectral measurements

Fig. 7. Fluorescence spectra of acriflavine hydrochloride detected by OFWF sensor and fluorescence spectrometer

Fig. 8. Surface enhanced Raman spectrum of hydrochloride measured by gold nanoparticle-doped polymer waveguide sensor