Collection mode surface plasmon fibre sensors: A new biosensing platform

Effect of surface roughness on metal enhanced fluorescence in planar substrates and optical fibers

“…A white light LED (Thorlabs Inc., MCWHL2) was used for SPR analysis. A presence of significant surface roughness of the metal coating allowed for analysis of light scattered by surface plasmons directly above the sensor surface [25][26][27] instead of transmission measurements as it is done in conventional SPR fibre sensors [33]. PE layer deposition and dye attachment on the fiber samples were performed inside the flow cell and the SPR response was recorded at each step of the functionalization process.…”

“…Based on the determined optimal surface roughness and the spacing between the fluorophore and the metal film, we demonstrate the fabrication of MEF based sensor on a side of a multimode optical fiber. It was previously reported that a fiber configuration with a rough silver coating could be used for fabrication of radiative Surface Plasmon Resonance (SPR) sensors that exploit scattering of the plasmonic wave [25][26][27]. Building on this SPR fiber sensing platform, we study the dependence of fluorescence intensity on the thickness of the silver films and discuss advantages and limitations of the MEF fiber sensor.…”

Exposed core microstructured optical fiber surface plasmon resonance biosensor

“…Moreover, it is possible to combine SPR technique with fluorescent sensing. 9 Most of the recent works have been centered around improvement of performance characteristics of SPR devices. One of the important performance characteristics is sensitivity which is defined as a change of the monitored parameter (such as wavelength or angle of incidence) with respect to a change in the parameter to be determined (refractive index).…”

Enzyme detection by surface plasmon resonance using specially engineered spacers and plasmonic labelling

“…The emission spectrum is resolve using a spectrometer. This rather simple but versatile architecture enables the user not only to assess the spectral position of the plasmonic resonance but also to perform fluorescence sensing as a secondary confirmation of the SPR sensing [13] . …”

“…A new type of SPR fibre sensor, recently reported in the literature [13] , has been used for this demonstration. While most commercial and experimental SPR sensors rely on either the measurement of the reflectivity of a metallic coating deposited on a dielectric [1,2,3] or spectral characterisation of light transmission through an optical fibre [14,15] , this new form of sensor exploits the re-emitted light from the plasmonic wave that occurs due to surface scattering [16,17] .…”