Details

Autor(en) / Beteiligte

• Ishikura, Nobuyuki
• Fujii, Minoru
• Nishida, Kohei
• Hayashi, Shinji
• Diener, Joachim

Titel

Dichroic rugate filters based on birefringent porous silicon

Ist Teil von

• Optics express, 2008-09, Vol.16 (20), p.15531-15539

Ort / Verlag

United States

Erscheinungsjahr

2008

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• Rugate filters made of anisotropically nanostructured birefringent silicon have been fabricated and studied by polarization-resolved transmission measurements. Electrochemical etching of a (110) oriented Si wafer results in porous silicon layers which exhibit a strong in-plane birefringence. We demonstrate that a sinusoidal refractive index variation of birefringent porous silicon combined with index-matching layers and apodization results in a dichroic rugate filter having a stop-band dependent on the polarization direction of the incident light without higher-order harmonics and sidelobes. We also demonstrate that the combination of different dichroic rugate filters allow us to realize filters with more complex properties in a single preparation step.