19 February 2009 Multi-channel biodetection via resonant microcavities coupled to a photonic crystal waveguide
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Photonic crystal (PhC) microcavities present multiple advantages for rapid, accurate, label-free, and sensitive detection. But their principle of operation (observation of a peak in transmission) makes their integration in serial arrays difficult. Here we report on multiple resonant cavities coupled to a single photonic crystal waveguide. The device configuration consists of a PhC waveguide with a defect line along which light is guided. Several resonant microcavities, created by modifying the radius of a hole adjacent to the defect line, are coupled to the waveguide. This PhC device, operating as a multi-channel sensor, maintains the advantages of the PhC microcavities and allows for serial arrays: Light is globally transmitted through the waveguide, except for the wavelengths corresponding to the resonant modes of the microcavities. The transmission spectrum shows as many dips as there are cavities. Simulations show that the sensitivity of such structures allows the detection of single particles -typically a virus. Preliminary results show the fabrication and characterization of a double-channel structure with small defects as a solvent sensor.
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Elisa Guillermain, Elisa Guillermain, Philippe M. Fauchet, Philippe M. Fauchet, } "Multi-channel biodetection via resonant microcavities coupled to a photonic crystal waveguide", Proc. SPIE 7167, Frontiers in Pathogen Detection: From Nanosensors to Systems, 71670D (19 February 2009); doi: 10.1117/12.808008; https://doi.org/10.1117/12.808008

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