We report an experimental study of porous silicon-based rugate filters. Possible optimisations that can improve different features of the filters are investigated. We demonstrate sidelobe attenuation by means of half-apodization of the structures with a sinusoidal window. Reduction of interference ripples are experimentally observed through the insertion of index-matching layers on the boundaries of the structure. The superposition of two different designs to obtain a multi-stop-band filter is also demonstrated. We show the possibility of controlling the bandwidth of the stop-bands by varying the index contrast. All the results are discussed and compared with numerical calculations. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Fabrication and optimization of rugate filters based on porous silicon

OTON NIETO, CLAUDIO JOSE;
2005-01-01

Abstract

We report an experimental study of porous silicon-based rugate filters. Possible optimisations that can improve different features of the filters are investigated. We demonstrate sidelobe attenuation by means of half-apodization of the structures with a sinusoidal window. Reduction of interference ripples are experimentally observed through the insertion of index-matching layers on the boundaries of the structure. The superposition of two different designs to obtain a multi-stop-band filter is also demonstrated. We show the possibility of controlling the bandwidth of the stop-bands by varying the index contrast. All the results are discussed and compared with numerical calculations. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11382/511008
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