A long-range surface plasmon-polariton waveguide ring resonator as a platform for (bio)sensor applications Journal of Optics, Bristol : Institute of Physics -IOP ,v. 13, n. 11, p. 115001-1-115001-7, Nov. 2011 http://www.producao.usp Abstract A ring plasmon-polariton resonator has been investigated and proposed as a promising platform for (bio)sensor devices. Many applications related to sensitive, miniaturized, and lab-on-a-chip devices can be realized with the structure proposed in this work. This structure consists of a rib-type ring configuration employing a metallic film sandwiched by dielectric layers. The adopted operating wavelength is λ = 1550 nm. Our theoretical investigation shows that the proposed structure not only has low loss, and consequently a long propagation distance (2.17 mm), but also a good lateral field confinement and a quality factor Q tot ≈ 1146. This high quality factor is essential for sensing applications where the conductivity of analyte mixtures is allowed to vary.
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