National Tsing Hua University Institutional Repository:Study of Photonic Crystal Cavities for Biosensors
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    Title: Study of Photonic Crystal Cavities for Biosensors
    Authors: Minh-Hang Nguyen;Ming-Chang M. Lee;Fan-Gang Tseng
    Teacher: 李明昌
    Date: 2010
    Publisher: Institute of Electrical and Electronics Engineers
    Relation: IEEE the 2010 International Conference on Nanotechnology, Seoul, Korea, 17-20 Aug. 2010
    Keywords: Study of Photonic Crystal Cavities for Biosensors
    Abstract: A highly sensitive biosensor based on a silicon photonic crystal waveguide incorporating microcavities is investigated using two-dimensional Finite Difference Time Domain method. With a microcavity placed near the waveguide, a dip is observed on the waveguide transmission spectrum, corresponding to the resonance wavelength of the cavity. Any change of the medium surrounding to the waveguide and cavity results in the shift of the dip in the transmission spectrum. Our simulation shows an optimal geometry of the cavity nearby the waveguide to have high sensitivity. Several materials with refractive indices ranging from 1 (the air) to 1.57 (Bovine serum albumin - BSA) were studied and showed that the best sensitivity of 194 nm/RIU and limit of detection of 5×10-5 RIU can be achieved. The varied resonance wavelength as a second-order polynomial function of refractive index was observed. The sensor is appropriate for detecting homogeneous medium.
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    Appears in Collections:[Department of Electrical Engineering] EE Conference Papers
    [Center for Nanotechology, Materials Science, and Microsystems ] CNMM Conference Papers
    [Institute of Photonics Technologies] IPT Conference Papers
    [Institute of Microelectromechanical System ] MEMS Conference Papers

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