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During the past few years, interest in the development of novel drug delivery systems for existing drug molecules has been renewed. The development of a novel delivery system for existing drug molecules not only improves the drug's performance in terms of efficacy and safety but also improves patient compliance and overall therapeutic benefit to a significant extent. Transdermally delivered drugs avoid the risk and inconvenience of intravenous therapy, usually provide less chance of an overdose or underdose, allow easy termination, and permit both local and systemic treatment effects....

Silicon has been considered for a long time unsuitable for photonic applications. Among the different approaches developed to overcome this problem, quantum confinement in silicon nanostructures and rare earth doping in crystalline silicon have received a great attention. A combination of these two approaches leads to a strong & efficient enhancement of the erbium emission in silicon nanocrystal. Luminescent emission wavelength (1.54um) of erbium corresponds to the minimum attenuation in long haul optical communication. Besides, Si-nc enables inexpensive and efficient pumping. Enhanced...