Fabrication and optimization of rugate filters based on porous silicon
نویسندگان
چکیده
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.
منابع مشابه
Porous silicon based narrow line-width rugate filters
We report on the design and fabrication of porous silicon based rugate filters. We have achieved narrow line-width, high reflectivity optical filters made entirely from silicon by continuously varying of the refractive index of Si and apodizing the index profile of the structure. 2005 Elsevier B.V. All rights reserved.
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