title: Coupling of localized surface plasmons to U-shaped cavities for high-sensitivity and miniaturized detectors.
abstract: We report numerical analysis of the coupling of localized surface plasmons to the modes of U-shaped cavities. The coupling results in intense resonance for which the electric field is strongly enhanced on the cavity surfaces. As a result, an optical vortex in the power flow is formed in the cavities and a sharp and strong resonance dip is observed in the reflectance spectrum. High sensitivity of the dip wavelength to change in the refractive index of the surrounding medium is reported. The high sensitivity is realized with a small number of cavities, thus enabling miniaturization of detectors based on U-shaped cavities.
authors: Department of Mechanical Engineering, School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan.
authors: Ya-Lun
authors: YL
authors: Ho
authors: Yaerim
authors: Y
authors: Lee
authors: Etsuo
authors: E
authors: Maeda
authors: Jean-Jacques
authors: JJ
authors: Delaunay
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008904:Miniaturization; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D014159:Transducers