Detection of Water Content in Biological Tissues Using a He-Ne Laser and a One-dimensional (1-D) Photonic Waveguide
M.K. Sahoo, M. Thillai Rani, D. Patnaik and G. Palai
The present research assesses the amount of the water in the biological tissues is using He-Ne laser and a Si-based one-dimensional (1-D) photonic waveguide through an experimental in situ monitoring method. The principle of measurement of water relies on the variation of density of water with respect to the transmitted energy (output energy), where the transmitted efficiency of the signal is determined through both experiment and theory. The measured spectrum was compared with the spectrum simulated by using the plane wave expansion method and was in good agreement with the simulated one. Further the accuracy of the investigation as well as the relation between output energy and density is found. The error of computation is found to be less than 10-5 which suggests that the proposed method is suitable for the investigation of biological tissues.
Keywords: He-Ne laser, one-dimensional (1-D) photonic waveguide, water, biological tissue, plane wave expansion