High sensitivity temperature measurement via mask-free hybrid polymer long period fiber grating

Bjorn Paulson, Hojoong Jung, Jihyun Hwang, Seongjin Hong, Sanghwa Lee, Jun Ki Kim, Kyunghwan Oh

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

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 °C −1 is obtained experimentally for attenuation near 1180 nm, and a sensitivity of 4.5 nm °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.

Original languageEnglish
Pages (from-to)16125-16137
Number of pages13
JournalOptics Express
Volume26
Issue number13
DOIs
Publication statusPublished - 2018 Jun 25

Bibliographical note

Funding Information:
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).

Funding Information:
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). The authors would like to thank Dr. Marzieh Pournoury for helpful discussions during the development of the manuscript. The authors declare that there are no conflicts of interest related to this article.

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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