Simultaneous Measurement of the Refractive Index and Temperature Based on Microdisk Resonator With Two Whispering-Gallery Modes
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2. ENGINEERING AND TECHNOLOGY
In conclusion, simultaneous measurement of surrounding RI and temperature changes can be achieved by using two WGMs. The transmission responses of the WGM (1, 28) and WGM (0,36) with different Wgap indicate their different coupling status. The RI and temperature sensing performances by monitoring the resonance wavelengths of a single WGM and two WGMs are investigated. The results show that the RI sensitivity by only monitoring the resonance wavelength shift of the WGM (1, 28) is 72.9402 nm/RIU, which is higher than that (42.5211 or 45.8821 nm/RIU for different Wgap) of the WGM (0, 36). However, the approximate temperature sensitivities of 0.0730 and 0.0703 nm/K for WGM (0, 36) and WGM (1, 28) are respectively achieved by monitoring different WGMs. Thus, the RI and temperature changes are simultaneously measured by monitoring the resonance shifts of the two WGMs with a character matrix. In other words, the measurement of RI with less temperature influence is achieved by monitoring δλWGM with the compromising RI sensitivity. The proposed sensor has a potential application in simultaneous measurement of multi-variables, such as RI, temperature, humidity, stress, etc., by using more WGMs and is easy to integrate with other SOI devices.
Ma, T., Yuan, J. & Sun, L. (2017). Simultaneous Measurement of the Refractive Index and Temperature Based on Microdisk Resonator With Two Whispering-Gallery Modes. IEEE Photonics Journal, vol. 9, no.1. doi:10.1109/JPHOT.2017.2648259