Silicon nano-membrane based photonic crystal microcavities for high sensitivity bio-sensing |
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Authors: | Lai Wei-Cheng Chakravarty Swapnajit Zou Yi Chen Ray T |
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Institution: | Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, Texas 78712, USA. |
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Abstract: | We experimentally demonstrated photonic crystal microcavity based resonant sensors coupled to photonic crystal waveguides in silicon nano-membrane on insulator for chemical and bio-sensing. Linear L-type microcavities are considered. In contrast to cavities with small mode volumes, but low quality factors for bio-sensing, we showed increasing the length of the microcavity enhances the quality factor of the resonance by an order of magnitude and increases the resonance wavelength shift while retaining compact device characteristics. Q~26760 and sensitivity down to 15 ng/ml and ~110 pg/mm2 in bio-sensing was experimentally demonstrated on silicon-on-insulator devices. |
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