Journal
OPTICS EXPRESS
Volume 13, Issue 19, Pages 7609-7614Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPEX.13.007609
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The use of large-mode-area tapered holey fibers with collapsed air holes for refractive index sensing is demonstrated. The collapsing of the holes is achieved by tapering the fibers with a slow-and-hot method. This non adiabatic process makes the core mode to couple to multiple modes of the solid taper waist. Owing to the beating between the modes the transmission spectra of the tapered holey fibers exhibit several interference peaks. They shift remarkable to longer wavelengths as the external index increases. The multiple peaks, combined with a fitting algorithm, may allow high-accuracy refractometric measurements which can be used for diverse applications. (c) 2005 Optical Society of America.
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