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.
© 2012 Chinese Optics Letters
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