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Fabrication of Multi-Optical Filters Based on Encoded Rugate Porous Silicon

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Flexible rugate porous silicon (PSi)/polystyrene composite films were prepared for the possible use of a tunable band-rejection filter. Rugate PSi was generated by applying a computer-generated pseudo-sinusoidal current waveform through an electrochemical etching. A composite waveform of current density containing two to four sine components was used for the optical encoding method. The values of used frequency for each of the sine components varied from 0.38 to 0.44 Hz, with a spacing of 0.02 Hz between each sine component. When the composite film was exposed to the air-saturated vapor of media, the transmission resonances were shifted to the longer wavelength, indicating that the transmission resonances were tunable by the control of a medium dose. Two other rugate PSi/polymer composite films were prepared by the modification of surface of rugate PSi through either thermal oxidation or photolytic hydrosilation. The shift of transmission resonances depends on both the surface functionalities of composite films and the properties of dose media. Hydrophobic composite films modified with dodecyl functionality displayed a much greater affinity for hydrophobic media.
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Keywords: COMPOSITE FILM; POROUS SILICON; REFLECTION; RUGATE FILTER; TRANSMISSION

Document Type: Research Article

Publication date: 2008-10-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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