Thermo-optic characteristic of DNA thin solid film and its application as a biocompatible optical fiber temperature sensor

Seongjin Hong, Woohyun Jung, Tavakol Nazari, Sanggwon Song, Taeoh Kim, Chai Quan, Kyunghwan Oh

Research output: Contribution to journalArticle

16 Citations (Scopus)


We report unique thermo-optical characteristics of DNA-Cetyl tri-methyl ammonium (DNA-CTMA) thin solid film with a large negative thermo-optical coefficient of -3.4 × 10 -4 /°C in the temperature range from 20°C to 70°C without any observable thermal hysteresis. By combining this thermo-optic DNA film and fiber optic multimode interference (MMI) device, we experimentally demonstrated a highly sensitive compact temperature sensor with a large spectral shift of 0.15 nm/°C. The fiber optic MMI device was a concatenated structure with single-mode fiber (SMF)-coreless silica fiber (CSF)-single mode fiber (SMF) and the DNA-CTMA film was deposited on the CSF. The spectral shifts of the device in experiments were compared with the beam propagation method, which showed a good agreement.

Original languageEnglish
Pages (from-to)1943-1945
Number of pages3
JournalOptics Letters
Issue number10
Publication statusPublished - 2017 May 15


All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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