Noninvasive and real-time plasmon waveguide resonance thermometry

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Abstract

In this paper, the noninvasive and real-time plasmon waveguide resonance (PWR) thermometry is reported theoretically and demonstrated experimentally. Owing to the enhanced evanescent field and thermal shield effect of its dielectric layer, a PWR thermometer permits accurate temperature sensing and has a wide dynamic range. A temperature measurement sensitivity of 9.4 × 10−3 °C is achieved and the thermo optic coefficient nonlinearity is measured in the experiment. The measurement of water cooling processes distributed in one dimension reveals that a PWR thermometer allows real-time temperature sensing and has potential to be applied for thermal gradient analysis. Apart from this, the PWR thermometer has the advantages of low cost and simple structure, since our transduction scheme can be constructed with conventional optical components and commercial coating techniques.

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Zhang, P., Liu, L., He, Y., Zhou, Y., Ji, Y., & Ma, H. (2015). Noninvasive and real-time plasmon waveguide resonance thermometry. Sensors (Switzerland), 15(4), 8481–8498. https://doi.org/10.3390/s150408481

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