Whispering-gallery mode silica sensors for superconductive tape temperature measurement

Yihua Hao, Zhixiong Guo

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Optical whispering-gallery mode microsensors have been proven to measure temperature with high accuracy and sensitivity. In this work, we put a silica microsphere which is coupled to a fiber taper on a superconductive tape to characterize the electrical conductivity variation against temperature. The superconductive tape was placed inside a chilling chamber. Liquid nitrogen is used to make the air temperature in the lab-made chamber lower than the critical temperature (~ 110 K) of the high-temperature superconductor. A distributed feedback laser at 1516 nm is used to excite the resonance in the microsphere. The optical signal, particularly the resonance wavelength shifts, is recorded by a Picoscope corresponding to temperature increment. Meanwhile, a T-type thermal couple is used to calibrate the temperature data of the superconductive tape to obtain the relationship between temperature and resonance wavelength shifts. The electrical resistivity of the superconductor is measured by the 4-point probe method. The sensitivity of the optical sensor is determined by the thermal expansion and thermo-optic coefficients of the silica material. The measured sensitivities vary from 3.6 pm/K to 5.5 pm/K. The quality factor of the resonator under low temperature reaches 2.2 × 106. The present study has demonstrated the potential of WGM microsensors for determining the critical temperature and monitoring the temperature variation of superconductors.

Original languageEnglish (US)
Title of host publication4th Thermal and Fluids Engineering Conference, TFEC 2019
PublisherBegell House Inc.
Number of pages8
ISBN (Electronic)9781567004724
StatePublished - 2019
Event4th Thermal and Fluids Engineering Conference, TFEC 2019 - Las Vegas, United States
Duration: Apr 14 2019Apr 17 2019

Publication series

NameProceedings of the Thermal and Fluids Engineering Summer Conference
ISSN (Electronic)2379-1748


Conference4th Thermal and Fluids Engineering Conference, TFEC 2019
Country/TerritoryUnited States
CityLas Vegas

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Electrical and Electronic Engineering
  • Fluid Flow and Transfer Processes
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment


  • Critical temperature
  • Optical resonance
  • Optical sensors
  • Superconductor
  • Temperature measurement
  • Wavelength shift
  • Whispering-gallery mode


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