Strain-Insensitive Biocompatible Temperature Sensor Based on DNA Solid Film on an Optical Microfiber
IEEE Photonics Technology Letters(2019)
摘要
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.
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关键词
Temperature sensors,Optical fiber sensors,Strain,Sensitivity,Optical fibers
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