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Sand-castle biperiodic pattern for spectral and angular broadening of antireflective properties

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Abstract

This Letter deals with the antireflective properties of top-patterned pyramids, looking like sand castles, bi-periodically repeated on a silicon surface. It is demonstrated numerically that such an original pattern allows a dramatic spectral and angular broadening of the antireflective efficiency. Design examples are given for wavelengths ranging from 0.5μmto5μm and incidence angles of 30° and 45°. Applications of such antireflective surfaces on photodetectors and solar cells are soon expected.

© 2010 Optical Society of America

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