Journal
OPTICS EXPRESS
Volume 26, Issue 13, Pages 16125-16137Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.26.016125
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Funding
- Ministry of Science, ICT & Future Planning [IITP 2014-044-014-002, NRF-2012M3A7B4049800, BSRP 2016k1A3A1A09918616]
- Agency for Defense Development of Korea [UD160069BD]
- National Research Foundation of Korea Basic Science Research Program [2014R1A1A2057773, 2015K2A7A1035896]
- Ministry of Trade, Industry & Energy Industrial Technology Innovation Program [10080726]
- National Research Foundation of Korea [2014R1A1A2057773] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Long-period fiber gratings (LPFGs) are useful for environmental sensing under conditions of high corrosiveness and electromagnetic interference. Most LPFGs are fabricated by coherent or high-power UV illumination of an optical fiber under an amplitude mask, resulting in narrow and environmentally-dependent band rejection. We present a hybrid LPFG waveguide fabricated without an amplitude mask through polymer self-assembly under low-power incoherent UV illumination, which demonstrates high-temperature sensitivity in its transmission spectrum compared to LPFG sensors based purely on silica waveguides. A sensitivity of 1.5 nm degrees C-1 is obtained experimentally for attenuation near 1180 nm, and a sensitivity of 4.5 nm degrees C-1 with a low random error was obtained with a composite of attenuation bands. Finite element method simulations and coupling mode theory reveal this to be due to a thermo-optic coefficient one order of magnitude greater than that of fused silica. The device has potential for a simple and inexpensive transmission intensity based temperature sensor consisting of an infrared light source, the LPFG, a bandpass filter, and a photodiode. (C) 2018 Optical Society of America under the tenns of the OSA Open Access Publishing Agreement
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