Raman scattering enhancement characteristic of a new kind of Nb-doped silica fiber has been studied in this paper. This
Nb-doped special silica optical fiber is fabricated on Modified Chemical Vapor Deposition (MCVD) (which is the
traditional fiber preform fabrication technologies) combined with Atomic Layer Deposition (ALD). Meanwhile, Raman
spectrum of different length Nb-doped special silica optical fiber samples has been measured with the 785nm exciting
light. Then, it develops the measurement comparison between Nb-doped special silica optical fiber and conventional
single-mode optical fiber in the wavelength range from 820nm to 920nm. The measuring results indicate that the new
Nb-doped special silica optical fiber shows higher Raman scattering intensity compared with conventional single-mode
optical fiber. On the other hand, the inferred spectrum of the new Nb-doped special silica optical fiber is also measured,
and its measurement wavenumber range is from 400 cm-1 to 4000 cm-1. Finally, the loss spectrum of the Nb-doped
special silica optical fiber is measured and its loss at 1550nm is 0.01dB/m.
A surface-enhanced Raman scattering (SERS) optical fiber sensor using biconical taper multi-mode fiber (MMF) is
proposed. It is fabricated by fused elongating a multi-mode fiber and then coated the silver colloid on its waist. The main
advantage of this sensor is that it can increase the SERS active substrate region to make more molecules be excited to
produce Raman signal. Silver colloid is selected as the active substrate of SERS. A modified immobilizing process is
introduced to increase the thickness of the immobilized layer and reduce the preparation time. Various concentration of
R6G is used to detect the performance of the sensor. Strong Raman signal is detected from the waist of the tapered fiber.
The detection sensitivity is up to 10-9M.
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