Abstract
The concept of a Microstructured Optical Fiber-based Surface Plasmon Resonance sensor with optimized microfluidics is proposed. In such a sensor plasmons on the inner surface of large metallized channels containing analyte can be excited by a fundamental mode of a single mode microstructured fiber. Phase matching between plasmon and a core mode can be enforced by introducing air filled microstructure into the fiber core, thus allowing tuning of the modal refractive index and its matching with that of a plasmon. Integration of large size microfluidic channels for efficient analyte flow together with a single mode waveguide of designable effective refractive index is attractive for the development of integrated highly sensitive MOF-SPR sensors operating at any designable wavelength.
Highlights
Propagating at the metal/dielectric interface, surface plasmons [1] are extremely sensitive to changes in the refractive index of the dielectric
In this paper we develop general principles of a Microstructured Optical Fiber design for applications in plasmonic sensing for which phase matching with a plasmon wave and optimized microfluidics are the two key requirements
To lower the refractive index of the core guided mode we introduce a small hole in the core center, which, in principle, can be substituted by an array of even smaller holes
Summary
Propagating at the metal/dielectric interface, surface plasmons [1] are extremely sensitive to changes in the refractive index of the dielectric. Phase matching problem can be alleviated by coupling to a plasmon via the high order modes of a multimode waveguide [16, 17, 18] Such modes can have significantly lower effective refractive indices than a waveguide core index. In such a setup light has to be launched into a waveguide as to excite high order modes some of which will be phase matched with a plasmon. We have demonstrated that effective refractive index of a Gaussian-like core mode propagating in the ati-guiding Bragg waveguide [20, 21] can be designed to take any value from 0 to that of a refractive index of a core material This allows phase matching and plasmon excitation by the Gaussian-like waveguide core mode at any desirable wavelength. Deposition of metal layers inside of the MOF can be performed ether with high pressure CVD technique [22] or wet chemistry deposition technique used in fabrication of metal covered hollow waveguides [23]
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