Refractive index sensor based on tapered PCF in-line interferometer |
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| Authors: | Qi Liu and Qin Wang |
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| Institution: | 1,2 1 Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China 2 Nanjing University High-Tech Institute at Suzhou, Suzhou 215123, China |
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| Abstract: | A simple and compact refractive index sensor is demonstrated by tapering a photonic crystal fiber (PCF) in-line interferometer. The PCF is spliced between two single-mode fibers and tapered via hydrofluoric acid etching. Its sensitivity in liquid is more than an order of magnitude larger than the untapered one. By optimizing the etching process, we can fabricate more uniformly and thinly tapered PCF interferometers with higher sensitivity in the future. |
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