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Opt Lett. 2010 May 1;35(9):1455-7. doi: 10.1364/OL.35.001455.

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

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Aix-Marseille University, Institut Matériaux Microélectronique Nanosciences de Provence-IM2NP CNRS UMR 6242, Campus de Saint-Jérôme, Avenue Escadrille Normandie Niemen-Service 231, F-13397 Marseille Cedex 20, France.


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 0.5 microm to 5 microm and incidence angles of 30 degrees and 45 degrees. Applications of such antireflective surfaces on photodetectors and solar cells are soon expected.

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