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 and incidence angles of 30° and 45°. Applications of such antireflective surfaces on photodetectors and solar cells are soon expected.
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