Optical-Fiber-Mounted Porous Silicon Photonic Crystals for Sensing Organic Vapor Breakthrough in Activated Carbon


  • This work was supported by the National Science Foundation Grant # DMR-0452579 and the Air Force Office of Scientific Research Grant# F49620-02-1-0288. A.M.R. thanks the University of California, San Diego for a Graduate Assistance in Areas of National Need (GAANN) fellowship. The authors thank Jason R. Dorvee for helpful discussions in the early phase of this project. Mention of any company, product, policy, or the inclusion of any reference does not constitute endorsement by National Institute for Occupational Safety and Health. The findings and conclusions of this manuscript are those of the authors and do not necessary represent the views of the National Institute for Occupational Safety and Health. Supporting Information is available online from Wiley InterScience or from the author.


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An electrochemically fabricated 1D photonic crystal of porous Si displaying a single reflectance peak is coupled to an optical fiber and embedded in activated carbon to sense the breakthrough of organic vapors (see figure). The sensor responds to various organic vapors, demonstrating filter end-of- service-life applications