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Surface sensitivity of straight long-range surface plasmon waveguides for attenuation-based biosensing |
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| Authors: | Wei Ru Wong Faisal Rafiq Mahamd Adikan Pierre Berini |
| Institution: | 1. Integrated Lightwave Research Group, Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia 2. School of Electrical Engineering and Computer Science, University of Ottawa, Ottawa, Canada 3. Department of Physics, University of Ottawa, Ottawa, Canada 4. Centre for Research in Photonics, University of Ottawa, Ottawa, Canada |
| Abstract: | The sensing performance of straight long-range surface plasmon waveguides consisting of a thin gold stripe embedded in Cytop is explored theoretically as a function of the metal stripe cross-sectional dimensions and the length of the sensing channel, and as a function of the sensing medium refractive index. The surface sensitivity and detection limit of such waveguides for attenuation-based biosensing are assessed. We find that changes in coupling efficiency between the sensing waveguide and the access waveguides, and changes in attenuation constant, due to adlayer formation, can contribute additively to the sensing performance. We observed a trade-off between the insertion loss and the change in insertion loss occurring during sensing. Optimum designs leading to compact, sensitive, and cost-effective biosensors are reported. |
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