Design and fabrication of gas sensing hollow core waveguides in near infrared

A category of gas sensing hollow core waveguide that was operated in near infrared was designed to solve their major obstacles in application including high scattering and high losses. An attenuated total reflection structure was developed by using MS theory and dynamic liquid phase processing. An explanation on how the loss was reduced by total reflectance was provided and a suitable thickness of Ag film by controlling the deposition time was achieved. The guide we designed had a simple structure, low loss and hence increased the sensitivity.