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.
Bibliographical noteFunding Information:
Manuscript received September 4, 2019; revised October 22, 2019; accepted October 24, 2019. Date of publication October 29, 2019; date of current version December 19, 2019.This work was supported by the National Research Foundation of Korea (NRF) Grant Funded by the Korean Government (MSIT) under Grant 2019R1A2C2011293. (Corresponding author: Kyunghwan Oh.) The authors are with the Photonic Device Physics Laboratory, Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, South Korea (e-mail: email@example.com; firstname.lastname@example.org; email@example.com; firstname.lastname@example.org). Digital Object Identifier 10.1109/LPT.2019.2950039
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering