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Self-assembled one dimensional pharmaceutical solids composed of caffeine, carbamazepine and glibenclamide drugs exhibit optical waveguiding tendency due to the efficient two dimensional lateral optical confinement effect. Additionally, the confined optical waves within the tubes were used to probe the nano-/micro-scale defect sites inherited during the tube self-assembly process via Raman spectroscopy.
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Chandrasekhar et al. (2014) studied this question.
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