Strain-Insensitive Biocompatible Temperature Sensor Based on DNA Solid Film on an Optical Microfiber

Sanggwon Song, Aeri Jung, Seongjin Hong, Kyunghwan Oh

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


We demonstrated a biocompatible and highly sensitive temperature sensor using DNA-CTMA (DNA-Cetyl trimethyl ammonium) solid film deposited on micro-tapered fiber. The micro-tapered silica fiber provided a built-in interferometer that was inherently sensitive to the environment variation due to the enhancement of evanescent wave interaction. The tapered region was coated with DNA-CTMA film with a high thermo-optic coefficient enabling a high-temperature sensitivity higher than -0.9 nm/°C in the bio-medically important region from 35 to 80 °C in a water bath. The cross-sensitivity problem between the temperature-sensing and the strain-sensing was successfully resolved since the elastic properties of the DNA-CTMA film on the micro-tapered silica fiber resulted in a very low strain sensitivity of -7 pm mu varepsilon . Detailed procedures for device fabrication and optical characterization of the proposed device were described.

Original languageEnglish
Article number8886478
Pages (from-to)1925-1928
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number24
Publication statusPublished - 2019 Dec 15

Bibliographical note

Publisher Copyright:
© 1989-2012 IEEE.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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