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    題名: Large-area super-resolution optical imaging by using core-shell microfibers
    作者: Cheng-Yang Liu;Wei-Chieh Lo
    關鍵詞: Photonic nanojet;microfiber;super-resolution
    日期: 2017-09-15
    上傳時間: 2017-05-05 02:10:23 (UTC+8)
    出版者: Elsevier BV
    摘要: We first numerically and experimentally report large-area super-resolution optical imaging achieved by using core-shell microfibers. The particular spatial electromagnetic waves for different core-shell microfibers are studied by using finite-difference time-domain and ray tracing calculations. The focusing properties of photonic nanojets are evaluated in terms of intensity profile and full width at half-maximum along propagation and transversal directions. In experiment, the general optical fiber is chemically etched down to 6 μm diameter and coated with different metallic thin films by using glancing angle deposition. The direct imaging of photonic nanojets for different core-shell microfibers is performed with a scanning optical microscope system. We show that the intensity distribution of a photonic nanojet is highly related to the metallic shell due to the surface plasmon polaritons. Furthermore, large-area super-resolution optical imaging is performed by using different core-shell microfibers placed over the nano-scale grating with 150 nm line width. The core-shell microfiber-assisted imaging is achieved with super-resolution and hundreds of times the field-of-view in contrast to microspheres. The possible applications of these core-shell optical microfibers include real-time large-area micro-fluidics and nano-structure inspections.
    關聯: Optics Communications 399, p.104-111
    DOI: 10.1016/j.optcom.2017.04.047
    顯示於類別:[機械與機電工程學系暨研究所] 期刊論文

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