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We experimentally demonstrated a periodically collapsed solid-core photonic crystal fiber (SCPCF) based modal interferometer for sensing refractive index (RI) of chemicals. A given piece of SCPCF is periodically collapsed using an easily and widely available commercial splicer machine and a micropositioner. The distance between the collapsed and nu...
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... probe with n = 14 showed a wavelength sensitivity of 230 nm/RIU, whereas the probes with the number of periods 5 and 9 showed a sensitivity of 112 nm/RIU and 166 nm/ RIU, respectively. The sensitivity variation for the three probes with different numbers of periods is shown in Figure 5. Sensitivity increases linearly with an increase in the number of periods. ...
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