NDLI: Optical sensing nanostructures for porous silicon rugate filters

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Optical sensing nanostructures for porous silicon rugate filters

Content Provider	Paperity
Author	Li, Sha Huang, Jianfeng Hu, Dehong Cai, Lintao
Abstract	Porous silicon rugate filters [PSRFs] and combination PSRFs [C-PSRFs] are emerging as interesting sensing materials due to their specific nanostructures and superior optical properties. In this work, we present a systematic study of the PSRF fabrication and its nanostructure/optical characterization. Various PSRF chips were produced with resonance peaks that are adjustable from visible region to near-infrared region by simply increasing the periods of sine currents in a programmed electrochemical etching method. A regression analysis revealed a perfect linear correlation between the resonant peak wavelength and the period of etching current. By coupling the sine currents with several different periods, C-PSRFs were produced with defined multiple resonance peaks located at desired positions. A scanning electron microscope and a microfiber spectrophotometer were employed to analyze their physical structure and feature spectra, respectively. The sensing properties of C-PSRFs were investigated in an ethanol vapor, where the red shifts of the C-PSRF peaks had a good linear relationship with a certain concentration of ethanol vapor. As the concentration increased, the slope of the regression line also increased. The C-PSRF sensors indicated the high sensitivity, quick response, perfect durability, reproducibility, and versatility in other organic gas sensing.
Starting Page	79
File Format	HTM / HTML
ISSN	19317573
DOI	10.1186/1556-276X-7-79
Issue Number	1
Journal	Nanoscale Research Letters
Volume Number	7
e-ISSN	1556276X
Language	English
Publisher	SpringerOpen
Publisher Date	2012-12-01
Access Restriction	Open
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Condensed Matter Physics

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