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- Title
Surface sensitivity of straight long-range surface plasmon waveguides for attenuation-based biosensing.
- Authors
Wong, Wei; Mahamd Adikan, Faisal; Berini, Pierre
- 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.
- Subjects
PLASMA waveguides; SENSITIVITY analysis; ATTENUATION (Physics); BIOSENSORS; REFRACTIVE index; CROSS-sectional method; COST effectiveness
- Publication
Applied Physics A: Materials Science & Processing, 2014, Vol 117, Issue 2, p527
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-014-8697-4