Express Analysis of Gas With Surface Enhanced Raman Scattering Waveguide Resonator

Various aspects of surface enhanced Raman scattering amplification in gases and liquids have been investigated utilizing active Raman enhancing surfaces and waveguide resonators. We demonstrate that surface enhanced Raman scattering amplification in gases is not as selective as in liquids. Thus, we develop a portable express analyzer of gas based on a surface-enhanced waveguide resonator. Its Raman scattering gain coefficient is compared quantitatively with that of a bulk Kagome Raman resonator. We estimate the Raman scattering gain coefficient in a hollow metal-plated tube due to multiple wall reflections of the pumping and scattered light beams. We consider Raman scattering amplification in a mirror tube, given an enhancing Raman surface as opposed to a simple focusing of the beam in a gas medium. For in-field gas monitoring online, the surface-enhanced Raman scattering waveguide resonator was combined with a portable spectrometer. The express gas analyzer with an active surface enhanced Raman scattering waveguide resonator proves superior to similar conventional technology in measurement speed and stability. We discuss an example of the practical application of the proposed system.