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Strong Localization of Light in Spongy Agglimerates of Carbon Grains

Ultraviolet extinction spectra of spongy agglomerates of amorphous carbon grains have been measured in the spectral range 100-300 nm. These spectra present two dips which can be explained in terms of strong localization of light in a disordered medium. The particular spongy structure of the carbon grains samples determines random fluctuations of the refraction index. When a light beam crosses samples having a granular structure, the fluctuatuions of n produce optical resonant modes which are localized along the disordered medium. Therefore, the transmission is enhanced for particular resonant frequences corresponding to the positive interferences of the light within an agglomeration of carbon grains having, in our experiment, a width of about 100 nm.