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Optical recording on microscopically textured surfaces

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Abstract

Textured surfaces consisting of submicron columns or cones have been formed in metals, semiconductors, and insulators. This structured surface morphology forms a graded-index-matching layer that reduces reflection of visible light to as low as 0.1 %. The optical properties of this surface can be permanently altered on a ≲ 1-μm size scale by irradiation with a focused low-power laser beam. The light energy transforms the optically absorbing textured surface to a nonabsorbing smooth one by melting the structures or initiating a chemical reaction.

© 1982 Optical Society of America

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