16 May 2017 Enhanced linear photonic nanojet generated by core-shell optical microfibers
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The generation of linear photonic nanojet using core-shell optical microfiber is demonstrated numerically and experimentally in the visible light region. The power flow patterns for the core-shell optical microfiber are calculated by using the finite-difference time-domain method. The focusing properties of linear photonic nanojet are evaluated in terms of length and width along propagation and transversal directions. In experiment, the silica optical fiber is etched chemically down to 6 μm diameter and coated with metallic thin film by using glancing angle deposition. We show that the linear photonic nanojet is enhanced clearly by metallic shell due to surface plasmon polaritons. The large-area superresolution imaging can be performed by using a core-shell optical microfiber in the far-field system. The potential applications of this core-shell optical microfiber include micro-fluidics and nano-structure measurements.
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Cheng-Yang Liu, Cheng-Yang Liu, Tzu-Ping Yen, Tzu-Ping Yen, Chien-Wen Chen, Chien-Wen Chen, } "Enhanced linear photonic nanojet generated by core-shell optical microfibers", Proc. SPIE 10232, Micro-structured and Specialty Optical Fibres V, 102320S (16 May 2017); doi: 10.1117/12.2264073; https://doi.org/10.1117/12.2264073

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