Nanoporous alumina-based interferometric transducers ennobled |
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Authors: | Dronov Roman Jane Andrew Shapter Joseph G Hodges Alastair Voelcker Nicolas H |
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Affiliation: | School of Chemical and Physical Sciences, Flinders University, SA 5001, Australia. |
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Abstract: | A high fidelity interferometric transducer is designed based on platinum-coated nanoporous alumina films. The ultrathin metal coating significantly improves fidelity of the interferometric fringe patterns in aqueous solution and increases the signal-to-noise ratio. The performance of this transducer is tested with respect to refractive index unit (RIU) sensitivity measured as a change in effective optical thickness (EOT) in response to a solvent change and compared to porous silicon based transducers. RIU sensitivity in the order of 55% is attainable for porous alumina providing excellent signal-to-noise ratio, which exceeds the sensitivity of current interferometric transducers. Finally, as a proof-of-principle, we demonstrate biosensing with two distinct immunoglobulin antibodies. |
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