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K. M. K. Srivatsa M. Bera A. Basu T. K. Bhattacharya 《Bulletin of Materials Science》2008,31(4):673-680
Antireflection coatings (ARCs) are deposited on the surfaces of optical elements like spectacle lenses to increase light transmission
and improve their performance. In the ophthalmic industry, plastic lenses are rapidly displacing glass lenses due to several
advantageous features. However, the deposition of ARCs on plastic lenses is a challenging task, because the plastic surface
needs treatment for adhesion improvement and surface hardening before depositing the ARC. This surface treatment is usually
done in a multi-stage process—exposure to energetic radiations, followed by deposition of a carbonyl hard coating by spin
or dip coating processes, UV curing, etc. However, this treatment can also be done by plasma processes. Moreover, the plasma
polymerization process allows deposition of optical films at room temperature, essential for plastics. The energetic ions
in plasma processes provide similar effects as in ion assisted physical deposition processes to produce hard coatings, without
requiring sophisticated ion sources. The plasma polymerization process is more economical than ion-assisted physical vapour
deposition processes as regards equipment and source materials and is more cost-effective, enabling the surface treatment
and deposition of the ARC in the same deposition system in a single run by varying the system parameters at each step. Since
published results of the plasma polymerization processes developed abroad are rather sketchy and the techniques are mostly
veiled in commercial secrecy, innovative and indigenous plasma-based techniques have been developed in this work for depositing
the complete ARCs on plastic substrates. 相似文献