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Vibrational overtone spectroscopy of molecules is a powerful tool for drawinginformation on molecular structure and dynamics. It relies on absorption ofnear infrared radiation (NIR) by molecular vibrations. Here we show theexperimental evidence of giant enhancement of the absorption of light insolutions of organic molecules due to the switch from ballistic to diffusivepropagation of light through a channel silicate glass waveguide. We alsoexperimentally address a dynamics of absorption as a function of time ofadsorption of the organic molecules on a waveguide. The observed enhancement indiffusion regime is by a factor of 300 in N-Methylaniline and by factor of 80in Aniline compared to the expected values in the ballistic propagation oflight in a waveguide. Our results underscore the importance of a guide surfacemodification and the disordered6 molecular nano-layer in enhancement ofabsorption by amines on engineered integrated system.

Giant absorption of light by molecular vibrations on a chip