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Extra high reflection coating with negative extinction coefficient

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Abstract

This Letter designed an extra high reflection filter by using multilayers with a negative k, commonly referred to as gain layers. The gain layer was fabricated by embedding CdS quantum dots in a dielectric layer. Experimental results indicated that the effective k value is around 0.0008. The associated optical and physical properties were also discussed. The application of gain layers is very forward-looking.

© 2013 Optical Society of America

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