Abstract
We propose a novel surface-plasmon-resonance sensor design based on coating the holes of a three-hole microstructured optical fiber with a low-index dielectric layer on top of which a gold layer is deposited. The use of all three fiber holes and their relatively large size should facilitate the fabrication of the inclusions and the infiltration of the analyte. Our numerical results indicate that the optical loss of the Gaussian guided mode can be made very small by tuning the thickness of the dielectric layer and that the refractive-index resolution for aqueous analytes is 1x 10(-4).
Highlights
Sazio et al [1] demonstrated that high-pressure chemical deposition techniques can be used to uniformly coat the hole surfaces of a microstructured optical fiber (MOF) with a variety of materials, e.g., with gold
Compact fiber-optic surface-plasmon-resonance (SPR) sensors for liquid substances can be constructed by infiltrating the analyte into the metal-coated holes of the MOF
We propose a novel SPR sensor design based on coating the inner surfaces of a three-hole MOF with a dielectric layer on top of which a gold layer is deposited
Summary
Sazio et al [1] demonstrated that high-pressure chemical deposition techniques can be used to uniformly coat the hole surfaces of a microstructured optical fiber (MOF) with a variety of materials, e.g., with gold. The resonance wavelength of the plasmon excitation strongly depends on the dielectric function of the material in contact with the metal Owing to this characteristic, compact fiber-optic surface-plasmon-resonance (SPR) sensors for liquid substances can be constructed by infiltrating the analyte into the metal-coated holes of the MOF. Numerical analyses of such MOF-integrated SPR sensors based on both index-guiding [5, 6] and bandgap-guiding [7] fibers have been reported In these proposed designs, selective coating and filling of the fiber holes are required. We propose a novel SPR sensor design based on coating the inner surfaces of a three-hole MOF with a dielectric layer on top of which a gold layer is deposited.
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